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CVE-2011-3297 (GCVE-0-2011-3297)
Vulnerability from cvelistv5 – Published: 2011-10-06 10:00 – Updated: 2024-08-06 23:29
VLAI
EPSS
Summary
Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4.1 before 4.1(7), when certain authentication configurations are used, allows remote attackers to cause a denial of service (module crash) by making many authentication requests for network access, aka Bug ID CSCtn15697.
Severity
No CVSS data available.
CWE
- n/a
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://exchange.xforce.ibmcloud.com/vulnerabilit… | vdb-entryx_refsource_XF |
| http://www.cisco.com/warp/public/707/cisco-sa-201… | vendor-advisoryx_refsource_CISCO |
Date Public
2011-10-05 00:00
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Advisory\"]},{\"url\":\"https://exchange.xforce.ibmcloud.com/vulnerabilities/70327\",\"source\":\"psirt@cisco.com\"},{\"url\":\"http://www.cisco.com/warp/public/707/cisco-sa-20111005-fwsm.shtml\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Vendor Advisory\"]},{\"url\":\"https://exchange.xforce.ibmcloud.com/vulnerabilities/70327\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
}
}
CERTA-2011-AVI-565
Vulnerability from certfr_avis - Published: 2011-10-13 - Updated: 2011-10-13
Plusieurs vulnérabilités permettant à un attaquant distant, soit de forcer l'équipement Cisco vulnérable à redémarrer, soit de contourner des politiques de sécurité ont été corrigées.
Description
Une première vulnérabilité affecte le système de journalisation syslog (CVE-2011-3296), dans le cas où l'équipement est configuré de la manière suivante :
- l'appareil possède des interfaces avec des adresses IPv6 ;
- la journalisation est activée (commande « logging enable ») ;
- le niveau de journalisation est de 6 ou 7, ou des messages de type 302015 sont créés manuellement.
Les équipements configurés pour utiliser le mode AAA (Authentication, Authorization and Accounting) sont vulnérables à une attaque en déni de service (CVE-2011-3297).
Une vulnérabilité dans l'implémentation du protocole TACACS+ (Terminal Access Controller Access-Control System Plus) permet à un attaquant distant de contourner les règles de contrôle d'accès gérées par ce protocole (CVE-2011-3298).
Quatre vulnérabilités dans le système d'inspection des paquets du protocole SunRPC permettent à une personne malintentionnée de provoquer l'arrêt de l'appareil à distance au moyen de messages spécialement construits (CVE-2011-3299, CVE-2011-3300, CVE-2011-3301 et CVE-2011-3302).
Enfin, une vulnérabilité dans le système d'inspection de paquets du protocole ILS permet à un attaquant de réaliser un déni de service lorsque celui-ci dirige du trafic spécialement conçu au travers de l'équipement vulnérable. L'équipement doit avoir activé l'inspection des paquets ILS (CVE-2011-3303).
Contournement provisoire
Différents contournements sont proposés par l'éditeur en fonction des vulnérabilités :
- désactiver la journalisation des messages de type 302015 (commande no logging message 302015) bloque la vulnérabilité CVE-2011-3297 ;
- désactiver l'inspection des paquets SunRPC (commande no inspect sunrpc) bloque les vulnérabilités CVE-2011-3299, CVE-2011-3300, CVE-2011-3301 et CVE-2011-3302 ;
- désactiver l'inspection des paquets ILS (commande no inspect ils) bloque la vulnérabilité CVE-2011-3303.
Solution
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
NoneImpacted products
References
| Title | Publication Time | Tags | |||
|---|---|---|---|---|---|
|
|||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "routeurs Cisco s\u00e9rie 7600.",
"product": {
"name": "N/A",
"vendor": {
"name": "Cisco",
"scada": false
}
}
},
{
"description": "Switch Cisco s\u00e9rie Catalyst 6500;",
"product": {
"name": "N/A",
"vendor": {
"name": "Cisco",
"scada": false
}
}
}
],
"affected_systems_content": null,
"content": "## Description\n\nUne premi\u00e8re vuln\u00e9rabilit\u00e9 affecte le syst\u00e8me de journalisation syslog\n(CVE-2011-3296), dans le cas o\u00f9 l\u0027\u00e9quipement est configur\u00e9 de la mani\u00e8re\nsuivante :\n\n- l\u0027appareil poss\u00e8de des interfaces avec des adresses IPv6 ;\n- la journalisation est activ\u00e9e (commande \u00ab logging enable \u00bb) ;\n- le niveau de journalisation est de 6 ou 7, ou des messages de type\n 302015 sont cr\u00e9\u00e9s manuellement.\n\nLes \u00e9quipements configur\u00e9s pour utiliser le mode AAA (Authentication,\nAuthorization and Accounting) sont vuln\u00e9rables \u00e0 une attaque en d\u00e9ni de\nservice (CVE-2011-3297).\n\nUne vuln\u00e9rabilit\u00e9 dans l\u0027impl\u00e9mentation du protocole TACACS+ (Terminal\nAccess Controller Access-Control System Plus) permet \u00e0 un attaquant\ndistant de contourner les r\u00e8gles de contr\u00f4le d\u0027acc\u00e8s g\u00e9r\u00e9es par ce\nprotocole (CVE-2011-3298).\n\nQuatre vuln\u00e9rabilit\u00e9s dans le syst\u00e8me d\u0027inspection des paquets du\nprotocole SunRPC permettent \u00e0 une personne malintentionn\u00e9e de provoquer\nl\u0027arr\u00eat de l\u0027appareil \u00e0 distance au moyen de messages sp\u00e9cialement\nconstruits (CVE-2011-3299, CVE-2011-3300, CVE-2011-3301 et\nCVE-2011-3302).\n\nEnfin, une vuln\u00e9rabilit\u00e9 dans le syst\u00e8me d\u0027inspection de paquets du\nprotocole ILS permet \u00e0 un attaquant de r\u00e9aliser un d\u00e9ni de service\nlorsque celui-ci dirige du trafic sp\u00e9cialement con\u00e7u au travers de\nl\u0027\u00e9quipement vuln\u00e9rable. L\u0027\u00e9quipement doit avoir activ\u00e9 l\u0027inspection des\npaquets ILS (CVE-2011-3303).\n\n## Contournement provisoire\n\nDiff\u00e9rents contournements sont propos\u00e9s par l\u0027\u00e9diteur en fonction des\nvuln\u00e9rabilit\u00e9s :\n\n- d\u00e9sactiver la journalisation des messages de type 302015 (commande\n no logging message 302015) bloque la vuln\u00e9rabilit\u00e9 CVE-2011-3297 ;\n- d\u00e9sactiver l\u0027inspection des paquets SunRPC (commande no inspect\n sunrpc) bloque les vuln\u00e9rabilit\u00e9s CVE-2011-3299, CVE-2011-3300,\n CVE-2011-3301 et CVE-2011-3302 ;\n- d\u00e9sactiver l\u0027inspection des paquets ILS (commande no inspect ils)\n bloque la vuln\u00e9rabilit\u00e9 CVE-2011-3303.\n\n## Solution\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des\ncorrectifs (cf. section Documentation).\n",
"cves": [
{
"name": "CVE-2011-3302",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-3302"
},
{
"name": "CVE-2011-3297",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-3297"
},
{
"name": "CVE-2011-3299",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-3299"
},
{
"name": "CVE-2011-3301",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-3301"
},
{
"name": "CVE-2011-3303",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-3303"
},
{
"name": "CVE-2011-3296",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-3296"
},
{
"name": "CVE-2011-3298",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-3298"
},
{
"name": "CVE-2011-3300",
"url": "https://www.cve.org/CVERecord?id=CVE-2011-3300"
}
],
"initial_release_date": "2011-10-13T00:00:00",
"last_revision_date": "2011-10-13T00:00:00",
"links": [],
"reference": "CERTA-2011-AVI-565",
"revisions": [
{
"description": "version initiale.",
"revision_date": "2011-10-13T00:00:00.000000"
}
],
"risks": [
{
"description": "D\u00e9ni de service \u00e0 distance"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
}
],
"summary": "Plusieurs vuln\u00e9rabilit\u00e9s permettant \u00e0 un attaquant distant, soit de\nforcer l\u0027\u00e9quipement Cisco vuln\u00e9rable \u00e0 red\u00e9marrer, soit de contourner\ndes politiques de s\u00e9curit\u00e9 ont \u00e9t\u00e9 corrig\u00e9es.\n",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans Cisco Firewall Services Module",
"vendor_advisories": [
{
"published_at": null,
"title": "Bulletin de s\u00e9curit\u00e9 Cisco 20111005-fwsm du 13 octobre 2011",
"url": "http://www.cisco.com/warp/public/707/cisco-sa-20111005-fwsm.shtml"
}
]
}
FKIE_CVE-2011-3297
Vulnerability from fkie_nvd - Published: 2011-10-06 10:55 - Updated: 2026-06-16 23:33
Severity
Summary
Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4.1 before 4.1(7), when certain authentication configurations are used, allows remote attackers to cause a denial of service (module crash) by making many authentication requests for network access, aka Bug ID CSCtn15697.
References
Impacted products
{
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{
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"vendor": "n/a",
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"version": "n/a"
}
]
}
],
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}
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"cveTags": [],
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{
"lang": "en",
"value": "Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4.1 before 4.1(7), when certain authentication configurations are used, allows remote attackers to cause a denial of service (module crash) by making many authentication requests for network access, aka Bug ID CSCtn15697."
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{
"lang": "es",
"value": "Cisco Firewall Services Module (FWSM) 3.1 anteriores a 3.1(21), 3.2 anteriores a 3.2(22), 4.0 anteriores a 4.0(16), y 4.1 anteriores a 4.1(7), si determinadas configuraciones de autenticaci\u00f3n son usadas, permite a atacantes remotos provocar una denegaci\u00f3n de servicio (ca\u00edda del m\u00f3dulo) haciendo muchas peticiones de autenticaci\u00f3n para el acceso a red. Tambi\u00e9n conocido como Bug ID CSCtn15697."
}
],
"id": "CVE-2011-3297",
"lastModified": "2026-06-16T23:33:02.760",
"metrics": {
"cvssMetricV2": [
{
"acInsufInfo": false,
"baseSeverity": "HIGH",
"cvssData": {
"accessComplexity": "LOW",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.8,
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:C",
"version": "2.0"
},
"exploitabilityScore": 10.0,
"impactScore": 6.9,
"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
"type": "Primary",
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}
]
},
"published": "2011-10-06T10:55:05.300",
"references": [
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"tags": [
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},
{
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},
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{
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"weaknesses": [
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"description": [
{
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"value": "CWE-287"
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"source": "nvd@nist.gov",
"type": "Primary"
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}
GHSA-Q23R-7GWJ-52CH
Vulnerability from github – Published: 2022-05-17 01:53 – Updated: 2022-05-17 01:53
VLAI
Details
Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4.1 before 4.1(7), when certain authentication configurations are used, allows remote attackers to cause a denial of service (module crash) by making many authentication requests for network access, aka Bug ID CSCtn15697.
{
"affected": [],
"aliases": [
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],
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],
"github_reviewed": false,
"github_reviewed_at": null,
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"severity": "HIGH"
},
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"id": "GHSA-q23r-7gwj-52ch",
"modified": "2022-05-17T01:53:47Z",
"published": "2022-05-17T01:53:47Z",
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},
{
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"url": "https://exchange.xforce.ibmcloud.com/vulnerabilities/70327"
},
{
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"url": "http://www.cisco.com/warp/public/707/cisco-sa-20111005-fwsm.shtml"
}
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"schema_version": "1.4.0",
"severity": []
}
GSD-2011-3297
Vulnerability from gsd - Updated: 2023-12-13 01:19Details
Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4.1 before 4.1(7), when certain authentication configurations are used, allows remote attackers to cause a denial of service (module crash) by making many authentication requests for network access, aka Bug ID CSCtn15697.
Aliases
Aliases
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"id": "GSD-2011-3297"
},
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"remediation": "unknown",
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"type": "vulnerability"
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"modified": "2023-12-13T01:19:09.149954Z",
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"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "COMPLETE",
"baseScore": 7.8,
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}
}
VAR-201110-0255
Vulnerability from variot - Updated: 2025-04-11 22:03Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4.1 before 4.1(7), when certain authentication configurations are used, allows remote attackers to cause a denial of service (module crash) by making many authentication requests for network access, aka Bug ID CSCtn15697. ( Module crash ) There is a vulnerability that becomes a condition. ( Module crash ) There is a possibility of being put into a state. An attacker can exploit this issue to cause the affected devices to reload, triggering a denial-of-service condition. This issue is tracked by Cisco Bug ID CSCtn15697.
Cisco has released free software updates that address these vulnerabilities. Workarounds are available for some of the vulnerabilities disclosed in this advisory. Affected versions of Cisco FWSM Software vary depending on the specific vulnerability. Refer to the "Software Version and Fixes" section for specific information on vulnerable versions.
Syslog Message Memory Corruption Denial of Service Vulnerability +---------------------------------------------------------------
Devices running vulnerable versions of Cisco FWSM Software are affected by this vulnerability if the following conditions are satisfied:
- The device has interfaces with IPv6 addresses
- System logging is enabled (command logging enable)
- The device is configured in any way to generate system log message 302015 (refer to the following examples)
System log message 302015 has a default severity level of 6 (informational) so, assuming that the system administrator has not changed this default severity level, the vulnerability can be triggered if the device is logging to any destination at level 6 or level 7 (debug). As an example, the following configuration is vulnerable:
logging enable
!
logging console informational
logging buffered informational
[...]
Using a custom message list (via the logging list command) that includes system log message 302015, either by severity or by explicitly including the message ID, is also a vulnerable configuration. For example, the following configuration is also vulnerable:
logging enable
!
logging list MYLIST level informational
<and/or>
logging list MYLIST message 302015
!
logging trap MYLIST
Note: The default severity level of system log messages can be changed. If the default severity level of system log message 302015 is changed, and the device is configured to log to any destination at the new severity level, then the device is still vulnerable. The network access authentication feature is enabled if the aaa authentication match or aaa authentication include commands are present in the configuration of an affected device.
TACACS+ Authentication Bypass Vulnerability +------------------------------------------
Devices running vulnerable versions of Cisco FWSM Software are affected by this vulnerability if they are configured to use the Terminal Access Controller Access-Control System Plus (TACACS+) protocol for AAA. A device is configured for TACACS+ if an AAA server group is defined in a manner similar to the following:
aaa-server my-tacacs-server protocol tacacs+
aaa-server my-tacacs-server (inside) host 192.168.1.1
[...]
Note: In the preceding example, "my-tacacs-server" is the name of the AAA server group.
SunRPC Inspection Denial of Service Vulnerabilities +--------------------------------------------------
Devices running vulnerable versions of Cisco FWSM Software are affected by these vulnerabilities if SunRPC inspection is enabled. SunRPC inspection is enabled by default.
To determine whether SunRPC inspection is enabled, issue the show service-policy | include sunrpc command and confirm that the command returns output. Example output follows:
FWSM# show service-policy | include sunrpc
Inspect: sunrpc, packet 324, drop 5, reset-drop 0
Alternatively, a device with SunRPC inspection enabled has a configuration similar to the following (the inspect sunrpc command is the command that actually enables SunRPC inspection, although the other commands are necessary for the Cisco FWSM to actually inspect traffic):
class-map inspection_default
match default-inspection-traffic
!
policy-map global_policy
class inspection_default
...
inspect sunrpc
!
service-policy global_policy global
Note: The service policy could also be applied to a specific interface. (Global application is shown in the previous example.)
ILS Inspection Denial of Service Vulnerability +---------------------------------------------
Devices running vulnerable versions of Cisco FWSM Software are affected by these vulnerabilities if inspection of the ILS protocol is enabled. ILS inspection is not enabled by default.
Refer to "SunRPC Inspection Denial of Service Vulnerabilities" for information on how to determine if ILS inspection is enabled. Use the configuration keyword "ils" instead of "sunrpc".
How to Determine the Running Software Version +--------------------------------------------
To determine the version of Cisco FWSM Software that is running on a device, issue the show module command from Cisco IOS Software or Cisco Catalyst Operating System Software to identify what modules and submodules are installed on the system.
The following example shows a system with a Cisco FWSM (WS-SVC-FWM-1) installed in slot 2:
switch>show module
Mod Ports Card Type Model Serial No.
--- ----- -------------------------------------- ------------------ -----------
1 16 SFM-capable 16 port 1000mb GBIC WS-X6516-GBIC SAL06334NS9
2 6 Firewall Module WS-SVC-FWM-1 SAD10360485
3 8 Intrusion Detection System WS-SVC-IDSM-2 SAD0932089Z
4 4 SLB Application Processor Complex WS-X6066-SLB-APC SAD093004BD
5 2 Supervisor Engine 720 (Active) WS-SUP720-3B SAL0934888E
Mod MAC addresses Hw Fw Sw Status
--- ---------------------------------- ------ ------------ ------------ -------
1 0009.11e3.ade8 to 0009.11e3.adf7 5.1 6.3(1) 8.7(0.22)BUB Ok
2 0018.ba41.5092 to 0018.ba41.5099 4.0 7.2(1) 4.0(16) Ok
3 0014.a90c.9956 to 0014.a90c.995d 5.0 7.2(1) 7.0(4)E4 Ok
4 0014.a90c.66e6 to 0014.a90c.66ed 1.7 Unknown Unknown PwrDown
5 0013.c42e.7fe0 to 0013.c42e.7fe3 4.4 8.1(3) 12.2(33)SXH8 Ok
[...]
After locating the correct slot, issue the show module command to identify the software version that is running, as shown in the following example:
switch>show module 2
Mod Ports Card Type Model Serial No.
--- ----- -------------------------------------- ------------------ -----------
2 6 Firewall Module WS-SVC-FWM-1 SAD10360485
Mod MAC addresses Hw Fw Sw Status
--- ---------------------------------- ------ ------------ ------------ -------
2 0018.ba41.5092 to 0018.ba41.5099 4.0 7.2(1) 4.0(16) Ok
[...]
The preceding example shows that the Cisco FWSM is running software version 4.0(16) as indicated by the Sw column.
Note: Recent versions of Cisco IOS Software will show the software version of each module in the output from the show module command; therefore, executing the show module command is not necessary.
If a Virtual Switching System (VSS) is used to allow two physical Cisco Catalyst 6500 Series switches to operate as a single logical virtual switch, the show module switch all command can display the software version of all FWSMs that belong to switch 1 and switch 2. The output from this command will be similar to the output from show module but will include module information for the modules in each switch in the VSS.
Alternatively, version information can be obtained directly from the Cisco FWSM through the show version command, as shown in the following example:
FWSM> show version
FWSM Firewall Version 4.0(16)
[...]
Customers who use the Cisco Adaptive Security Device Manager (ASDM) to manage their devices can find the version of the software displayed in the table in the login window or in the upper left corner of the Cisco ASDM window. The FWSM offers firewall services with stateful packet filtering and deep packet inspection.
The Cisco FWSM is affected by multiple vulnerabilities, which are described in the following sections.
Syslog Message Memory Corruption Denial of Service Vulnerability +---------------------------------------------------------------
The Cisco FWSM has a system log (syslog) feature that provides information for monitoring normal operation and troubleshooting network or device issues. System log messages are assigned different severities (debugging, informational, error, critical, etc.) and can be sent to different logging destinations.
A denial of service vulnerability exists in the implementation of one specific system log message (message ID 302015, "Built outbound UDP connection session-id for src-intf:IP/Port to dst-intf:IP/Port ARP-Incomplete") that can cause memory corruption and lead to a lock up or crash of the Cisco FWSM in the event that that system log message needs to be generated for IPv6 traffic that has flowed through the device. The Cisco FWSM may not recover on its own and a manual reboot may be necessary to recover.
System log message 302015 has a default severity level of 6 (informational). Changing the default severity level of this system message will not prevent the issue from occurring if the system is logging to any destinations at the new severity level. The Cisco FWSM must have interfaces with IPv6 addresses otherwise the problem does not occur. Specifically, the Cisco FWSM cut-through proxy challenges a user initially at the application layer and then authenticates against AAA servers. After the Cisco FWSM authenticates the user, it shifts the session flow, and all traffic flows directly between the user's computer and the network resource being accessed. Vulnerable configurations are those that contain the aaa authentication match or aaa authentication include commands.
TACACS+ Authentication Bypass Vulnerability +------------------------------------------
AAA enables the Cisco FWSM to determine who the user is (authentication), what the user can do (authorization), and what the user did (accounting).
An authentication bypass vulnerability exists in the TACACS+ implementation in the Cisco FWSM. Successful exploitation could allow a remote attacker to bypass TACACS+ authentication of VPN users (the Cisco FWSM only allows VPN sessions for management), firewall sessions, or administrative access to the device.
SunRPC Inspection Denial of Service Vulnerabilities +--------------------------------------------------
The SunRPC inspection engine enables or disables application inspection for the SunRPC protocol. SunRPC is used by Network File System (NFS) and Network Information Service (NIS). SunRPC services can run on any port. When a client attempts to access a SunRPC service on a server, it must learn the port on which the service is running. The client does this by querying the port mapper process, usually rpcbind, on the well-known port of 111.
The Cisco FWSM is affected by four vulnerabilities that may cause the device to reload during the processing of different crafted SunRPC messages when SunRPC inspection is enabled. These vulnerabilities are triggered only by transit traffic; traffic that is destined to the device does not trigger these vulnerabilities.
These vulnerabilities are documented in Cisco bug IDs CSCtq09972 CSCtq09978, CSCtq09986, and CSCtq09989; and have been assigned Common Vulnerabilities and Exposures (CVE) IDs CVE-2011-3299, CVE-2011-3300, CVE-2011-3301, and CVE-2011-3302, respectively.
ILS Inspection Denial of Service Vulnerability +---------------------------------------------
The ILS inspection engine provides Network Address Translation (NAT) support for Microsoft NetMeeting, SiteServer, and Active Directory products that use Lightweight Directory Access Protocol (LDAP) to exchange directory information with an ILS server.
The Cisco FWSM is affected by a vulnerability when ILS inspection is enabled that may cause the device to reload during the processing of a malformed ILS message. This vulnerability is triggered by transit traffic only; traffic that is destined to the device does not trigger this vulnerability.
Vulnerability Scoring Details +----------------------------
Cisco has provided scores for the vulnerabilities in this advisory based on the Common Vulnerability Scoring System (CVSS). The CVSS scoring in this Security Advisory is done in accordance with CVSS version 2.0.
CVSS is a standards-based scoring method that conveys vulnerability severity and helps determine urgency and priority of response.
Cisco has provided a base and temporal score. Customers can then compute environmental scores to assist in determining the impact of the vulnerability in individual networks.
Cisco has provided an FAQ to answer additional questions regarding CVSS at:
http://www.cisco.com/web/about/security/intelligence/cvss-qandas.html
Cisco has also provided a CVSS calculator to help compute the environmental impact for individual networks at:
http://intellishield.cisco.com/security/alertmanager/cvss
- CSCti83875 -- Syslog message 302015 may lead to memory corruption and CP lockup
CVSS Base Score - 7.8 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete
CVSS Temporal Score - 6.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
- CSCtn15697 -- FWSM crash in thread name uauth
CVSS Base Score - 7.8 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete
CVSS Temporal Score - 6.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
- CSCto74274 -- Crafted TACACS+ reply considered as successful auth by FWSM
CVSS Base Score - 7.9 Access Vector - Adjacent Network Access Complexity - Medium Authentication - None Confidentiality Impact - Complete Integrity Impact - Complete Availability Impact - Complete
CVSS Temporal Score - 6.5 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
- SunRPC Inspection Denial of Service Vulnerabilities
CVSS Base Score - 7.8 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete
CVSS Temporal Score - 6.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
- CSCtq57802 -- ILS inspection crash on malformed ILS traffic
CVSS Base Score - 7.8 Access Vector - Network Access Complexity - Low Authentication - None Confidentiality Impact - None Integrity Impact - None Availability Impact - Complete
CVSS Temporal Score - 6.4 Exploitability - Functional Remediation Level - Official-Fix Report Confidence - Confirmed
Impact
Successful exploitation of any of the denial of service vulnerabilities could cause an affected device to reload. Repeated exploitation could result in a sustained denial of service condition.
Successful exploitation of the TACACS+ authentication bypass vulnerability could allow an attacker to bypass authentication of VPN, firewall, and/or administrative sessions.
Software Versions and Fixes
When considering software upgrades, also consult: http://www.cisco.com/go/psirt and any subsequent advisories to determine exposure and a complete upgrade solution.
In all cases, customers should exercise caution to be certain the devices to be upgraded contain sufficient memory and that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, contact the Cisco Technical Assistance Center (TAC) or your contracted maintenance provider for assistance.
Each row of the following Cisco FWSM Software table describes a major Cisco FWSM Software train and the earliest possible release in that train that contains the fix (the "First Fixed Release") and the anticipated date of availability (if not currently available) in the First Fixed Release column. A device that is running a release that is earlier than the release in a specific column (earlier than the First Fixed Release) is known to be vulnerable. A vulnerable release should be upgraded to the indicated release at a minimum, or a later version (later than or equal to the First Fixed Release label).
Workarounds
This Cisco Security Advisory describes multiple distinct vulnerabilities. These vulnerabilities and their respective workarounds are independent of each other.
Syslog Message Memory Corruption Denial of Service Vulnerability +---------------------------------------------------------------
Completely disabling syslog 302015 with the command no logging message 302015 is an effective workaround for this vulnerability.
Authentication Proxy Denial of Service Vulnerability +---------------------------------------------------
There are no workarounds available for this vulnerability.
TACACS+ Authentication Bypass Vulnerability +------------------------------------------
There are no workarounds available for this vulnerability other than using a different authentication protocol such as RADIUS and LDAP.
SunRPC Inspection Denial of Service Vulnerabilities +--------------------------------------------------
Administrators can mitigate these vulnerabilities by disabling SunRPC inspection if it is not required. Administrators can disable SunRPC inspection by issuing the no inspect sunrpc command in class configuration sub-mode in the policy map configuration. Disabling SunRPC inspection may cause SunRPC traffic to stop transiting the security appliance.
ILS Inspection Denial of Service Vulnerability +---------------------------------------------
Administrators can mitigate this vulnerability by disabling ILS inspection if it is not required. Administrators can disable ILS inspection by issuing the no inspect ils command in class configuration sub-mode in the policy map configuration. Disabling ILS inspection may cause ILS traffic to stop through the security appliance.
Obtaining Fixed Software
Cisco has released free software updates that address these vulnerabilities. Prior to deploying software, customers should consult their maintenance provider or check the software for feature set compatibility and known issues specific to their environment.
Customers may only install and expect support for the feature sets they have purchased. By installing, downloading, accessing or otherwise using such software upgrades, customers agree to be bound by the terms of Cisco's software license terms found at: http://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html or as otherwise set forth at Cisco.com Downloads at: http://www.cisco.com/public/sw-center/sw-usingswc.shtml
Do not contact psirt@cisco.com or security-alert@cisco.com for software upgrades.
Customers with Service Contracts +-------------------------------
Customers with contracts should obtain upgraded software through their regular update channels. For most customers, this means that upgrades should be obtained through the Software Center on Cisco's worldwide website at http://www.cisco.com
Customers using Third Party Support Organizations +------------------------------------------------
Customers whose Cisco products are provided or maintained through prior or existing agreements with third-party support organizations, such as Cisco Partners, authorized resellers, or service providers should contact that support organization for guidance and assistance with the appropriate course of action in regards to this advisory.
The effectiveness of any workaround or fix is dependent on specific customer situations, such as product mix, network topology, traffic behavior, and organizational mission. Due to the variety of affected products and releases, customers should consult with their service provider or support organization to ensure any applied workaround or fix is the most appropriate for use in the intended network before it is deployed.
Customers without Service Contracts +----------------------------------
Customers who purchase direct from Cisco but do not hold a Cisco service contract, and customers who purchase through third-party vendors but are unsuccessful in obtaining fixed software through their point of sale should acquire upgrades by contacting the Cisco Technical Assistance Center (TAC). TAC contacts are as follows.
- +1 800 553 2447 (toll free from within North America)
- +1 408 526 7209 (toll call from anywhere in the world)
- e-mail: tac@cisco.com
Customers should have their product serial number available and be prepared to give the URL of this notice as evidence of entitlement to a free upgrade. Free upgrades for non-contract customers must be requested through the TAC.
Refer to http://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html for additional TAC contact information, including localized telephone numbers, and instructions and e-mail addresses for use in various languages.
Exploitation and Public Announcements
The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities described in this advisory.
The Syslog Message Memory Corruption Denial of Service Vulnerability, Authentication Proxy Denial of Service Vulnerability, and TACACS+ Authentication Bypass Vulnerability were discovered during the troubleshooting of customer service requests.
The SunRPC Inspection Denial of Service Vulnerabilities and ILS Inspection Denial of Service Vulnerability were discovered by Cisco during internal testing.
Status of this Notice: FINAL
THIS DOCUMENT IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE INFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS DOCUMENT AT ANY TIME.
A stand-alone copy or Paraphrase of the text of this document that omits the distribution URL in the following section is an uncontrolled copy, and may lack important information or contain factual errors.
Distribution
This advisory is posted on Cisco's worldwide website at:
http://www.cisco.com/warp/public/707/cisco-sa-20111005-fwsm.shtml
In addition to worldwide web posting, a text version of this notice is clear-signed with the Cisco PSIRT PGP key and is posted to the following e-mail and Usenet news recipients.
- cust-security-announce@cisco.com
- first-bulletins@lists.first.org
- bugtraq@securityfocus.com
- vulnwatch@vulnwatch.org
- cisco@spot.colorado.edu
- cisco-nsp@puck.nether.net
- full-disclosure@lists.grok.org.uk
- comp.dcom.sys.cisco@newsgate.cisco.com
Future updates of this advisory, if any, will be placed on Cisco's worldwide website, but may or may not be actively announced on mailing lists or newsgroups. Users concerned about this problem are encouraged to check the above URL for any updates.
Revision History
+---------------------------------------+ | Revision | | Initial | | 1.0 | 2011-October-05 | public | | | | release. | +---------------------------------------+
Cisco Security Procedures
Complete information on reporting security vulnerabilities in Cisco products, obtaining assistance with security incidents, and registering to receive security information from Cisco, is available on Cisco's worldwide website at: http://www.cisco.com/en/US/products/products_security_vulnerability_policy.html This includes instructions for press inquiries regarding Cisco security notices. All Cisco security advisories are available at: http://www.cisco.com/go/psirt
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"data": "Cisco Firewall Services Module (aka FWSM) 3.1 before 3.1(21), 3.2 before 3.2(22), 4.0 before 4.0(16), and 4.1 before 4.1(7), when certain authentication configurations are used, allows remote attackers to cause a denial of service (module crash) by making many authentication requests for network access, aka Bug ID CSCtn15697. ( Module crash ) There is a vulnerability that becomes a condition. ( Module crash ) There is a possibility of being put into a state. \nAn attacker can exploit this issue to cause the affected devices to reload, triggering a denial-of-service condition. \nThis issue is tracked by Cisco Bug ID CSCtn15697. \n\nCisco has released free software updates that address these\nvulnerabilities. Workarounds are available for some of the\nvulnerabilities disclosed in this advisory. Affected\nversions of Cisco FWSM Software vary depending on the specific\nvulnerability. Refer to the \"Software Version and Fixes\" section for\nspecific information on vulnerable versions. \n\nSyslog Message Memory Corruption Denial of Service Vulnerability\n+---------------------------------------------------------------\n\nDevices running vulnerable versions of Cisco FWSM Software are\naffected by this vulnerability if the following conditions are\nsatisfied:\n\n * The device has interfaces with IPv6 addresses\n * System logging is enabled (command logging enable)\n * The device is configured in any way to generate system log\n message 302015 (refer to the following examples)\n\nSystem log message 302015 has a default severity level of 6\n(informational) so, assuming that the system administrator has not\nchanged this default severity level, the vulnerability can be\ntriggered if the device is logging to any destination at level 6 or\nlevel 7 (debug). As an example, the following configuration is\nvulnerable:\n\n logging enable\n !\n logging console informational\n logging buffered informational\n [...]\n\nUsing a custom message list (via the logging list command) that\nincludes system log message 302015, either by severity or by\nexplicitly including the message ID, is also a vulnerable\nconfiguration. For example, the following configuration is also\nvulnerable:\n\n logging enable\n !\n logging list MYLIST level informational\n \u003cand/or\u003e\n logging list MYLIST message 302015\n !\n logging trap MYLIST\n\nNote: The default severity level of system log messages can be\nchanged. If the default severity level of system log message 302015\nis changed, and the device is configured to log to any destination at\nthe new severity level, then the device is still vulnerable. The\nnetwork access authentication feature is enabled if the aaa\nauthentication match or aaa authentication include commands are\npresent in the configuration of an affected device. \n\nTACACS+ Authentication Bypass Vulnerability\n+------------------------------------------\n\nDevices running vulnerable versions of Cisco FWSM Software are\naffected by this vulnerability if they are configured to use the\nTerminal Access Controller Access-Control System Plus (TACACS+)\nprotocol for AAA. A device is configured for TACACS+ if an AAA server\ngroup is defined in a manner similar to the following:\n\n aaa-server my-tacacs-server protocol tacacs+\n aaa-server my-tacacs-server (inside) host 192.168.1.1\n [...]\n\nNote: In the preceding example, \"my-tacacs-server\" is the name of the\nAAA server group. \n\nSunRPC Inspection Denial of Service Vulnerabilities\n+--------------------------------------------------\n\nDevices running vulnerable versions of Cisco FWSM Software are\naffected by these vulnerabilities if SunRPC inspection is enabled. \nSunRPC inspection is enabled by default. \n\nTo determine whether SunRPC inspection is enabled, issue the show\nservice-policy | include sunrpc command and confirm that the command\nreturns output. Example output follows:\n\n FWSM# show service-policy | include sunrpc\n Inspect: sunrpc, packet 324, drop 5, reset-drop 0\n\nAlternatively, a device with SunRPC inspection enabled has a\nconfiguration similar to the following (the inspect sunrpc command is\nthe command that actually enables SunRPC inspection, although the\nother commands are necessary for the Cisco FWSM to actually inspect\ntraffic):\n\n class-map inspection_default\n match default-inspection-traffic\n !\n policy-map global_policy\n class inspection_default\n ... \n inspect sunrpc \n !\n service-policy global_policy global\n\nNote: The service policy could also be applied to a specific\ninterface. (Global application is shown in the previous example.)\n\nILS Inspection Denial of Service Vulnerability\n+---------------------------------------------\n\nDevices running vulnerable versions of Cisco FWSM Software are\naffected by these vulnerabilities if inspection of the ILS protocol\nis enabled. ILS inspection is not enabled by default. \n\nRefer to \"SunRPC Inspection Denial of Service Vulnerabilities\" for\ninformation on how to determine if ILS inspection is enabled. Use the\nconfiguration keyword \"ils\" instead of \"sunrpc\". \n\nHow to Determine the Running Software Version\n+--------------------------------------------\n\nTo determine the version of Cisco FWSM Software that is running on a\ndevice, issue the show module command from Cisco IOS Software or\nCisco Catalyst Operating System Software to identify what modules and\nsubmodules are installed on the system. \n\nThe following example shows a system with a Cisco FWSM (WS-SVC-FWM-1)\ninstalled in slot 2:\n\n switch\u003eshow module\n Mod Ports Card Type Model Serial No. \n --- ----- -------------------------------------- ------------------ -----------\n 1 16 SFM-capable 16 port 1000mb GBIC WS-X6516-GBIC SAL06334NS9\n 2 6 Firewall Module WS-SVC-FWM-1 SAD10360485\n 3 8 Intrusion Detection System WS-SVC-IDSM-2 SAD0932089Z\n 4 4 SLB Application Processor Complex WS-X6066-SLB-APC SAD093004BD\n 5 2 Supervisor Engine 720 (Active) WS-SUP720-3B SAL0934888E\n \n Mod MAC addresses Hw Fw Sw Status\n --- ---------------------------------- ------ ------------ ------------ -------\n 1 0009.11e3.ade8 to 0009.11e3.adf7 5.1 6.3(1) 8.7(0.22)BUB Ok\n 2 0018.ba41.5092 to 0018.ba41.5099 4.0 7.2(1) 4.0(16) Ok\n 3 0014.a90c.9956 to 0014.a90c.995d 5.0 7.2(1) 7.0(4)E4 Ok\n 4 0014.a90c.66e6 to 0014.a90c.66ed 1.7 Unknown Unknown PwrDown\n 5 0013.c42e.7fe0 to 0013.c42e.7fe3 4.4 8.1(3) 12.2(33)SXH8 Ok\n \n [...]\n\nAfter locating the correct slot, issue the show module \u003cslot number\u003e\ncommand to identify the software version that is running, as shown in\nthe following example:\n\n switch\u003eshow module 2\n Mod Ports Card Type Model Serial No. \n --- ----- -------------------------------------- ------------------ -----------\n 2 6 Firewall Module WS-SVC-FWM-1 SAD10360485\n \n Mod MAC addresses Hw Fw Sw Status\n --- ---------------------------------- ------ ------------ ------------ -------\n 2 0018.ba41.5092 to 0018.ba41.5099 4.0 7.2(1) 4.0(16) Ok\n \n [...]\n\nThe preceding example shows that the Cisco FWSM is running software\nversion 4.0(16) as indicated by the Sw column. \n\nNote: Recent versions of Cisco IOS Software will show the software\nversion of each module in the output from the show module command;\ntherefore, executing the show module \u003cslot number\u003e command is not\nnecessary. \n\nIf a Virtual Switching System (VSS) is used to allow two physical\nCisco Catalyst 6500 Series switches to operate as a single logical\nvirtual switch, the show module switch all command can display the\nsoftware version of all FWSMs that belong to switch 1 and switch 2. \nThe output from this command will be similar to the output from show\nmodule \u003cslot number\u003e but will include module information for the\nmodules in each switch in the VSS. \n\nAlternatively, version information can be obtained directly from the\nCisco FWSM through the show version command, as shown in the\nfollowing example:\n\n FWSM\u003e show version\n \n FWSM Firewall Version 4.0(16)\n [...]\n\nCustomers who use the Cisco Adaptive Security Device Manager (ASDM)\nto manage their devices can find the version of the software\ndisplayed in the table in the login window or in the upper left\ncorner of the Cisco ASDM window. The FWSM\noffers firewall services with stateful packet filtering and deep\npacket inspection. \n\nThe Cisco FWSM is affected by multiple vulnerabilities, which are\ndescribed in the following sections. \n\nSyslog Message Memory Corruption Denial of Service Vulnerability\n+---------------------------------------------------------------\n\nThe Cisco FWSM has a system log (syslog) feature that provides\ninformation for monitoring normal operation and troubleshooting\nnetwork or device issues. System log messages are assigned different\nseverities (debugging, informational, error, critical, etc.) and can\nbe sent to different logging destinations. \n\nA denial of service vulnerability exists in the implementation of one\nspecific system log message (message ID 302015, \"Built outbound UDP\nconnection session-id for src-intf:IP/Port to dst-intf:IP/Port\nARP-Incomplete\") that can cause memory corruption and lead to a lock\nup or crash of the Cisco FWSM in the event that that system log\nmessage needs to be generated for IPv6 traffic that has flowed\nthrough the device. The Cisco FWSM may not recover on its own and a\nmanual reboot may be necessary to recover. \n\nSystem log message 302015 has a default severity level of 6\n(informational). Changing the default severity level of this system\nmessage will not prevent the issue from occurring if the system is\nlogging to any destinations at the new severity level. The Cisco FWSM\nmust have interfaces with IPv6 addresses otherwise the problem does\nnot occur. Specifically, the Cisco FWSM\ncut-through proxy challenges a user initially at the application\nlayer and then authenticates against AAA servers. After the Cisco\nFWSM authenticates the user, it shifts the session flow, and all\ntraffic flows directly between the user\u0027s computer and the network\nresource being accessed. Vulnerable configurations are those that\ncontain the aaa authentication match or aaa authentication include\ncommands. \n\nTACACS+ Authentication Bypass Vulnerability\n+------------------------------------------\n\nAAA enables the Cisco FWSM to determine who the user is\n(authentication), what the user can do (authorization), and what the\nuser did (accounting). \n\nAn authentication bypass vulnerability exists in the TACACS+\nimplementation in the Cisco FWSM. Successful exploitation could allow\na remote attacker to bypass TACACS+ authentication of VPN users (the\nCisco FWSM only allows VPN sessions for management), firewall\nsessions, or administrative access to the device. \n\nSunRPC Inspection Denial of Service Vulnerabilities\n+--------------------------------------------------\n\nThe SunRPC inspection engine enables or disables application\ninspection for the SunRPC protocol. SunRPC is used by Network File\nSystem (NFS) and Network Information Service (NIS). SunRPC services\ncan run on any port. When a client attempts to access a SunRPC\nservice on a server, it must learn the port on which the service is\nrunning. The client does this by querying the port mapper process,\nusually rpcbind, on the well-known port of 111. \n\nThe Cisco FWSM is affected by four vulnerabilities that may cause the\ndevice to reload during the processing of different crafted SunRPC\nmessages when SunRPC inspection is enabled. These vulnerabilities are\ntriggered only by transit traffic; traffic that is destined to the\ndevice does not trigger these vulnerabilities. \n\nThese vulnerabilities are documented in Cisco bug IDs CSCtq09972\nCSCtq09978, CSCtq09986, and CSCtq09989; and have been assigned Common\nVulnerabilities and Exposures (CVE) IDs CVE-2011-3299, CVE-2011-3300,\nCVE-2011-3301, and CVE-2011-3302, respectively. \n\nILS Inspection Denial of Service Vulnerability\n+---------------------------------------------\n\nThe ILS inspection engine provides Network Address Translation (NAT)\nsupport for Microsoft NetMeeting, SiteServer, and Active Directory\nproducts that use Lightweight Directory Access Protocol (LDAP) to\nexchange directory information with an ILS server. \n\nThe Cisco FWSM is affected by a vulnerability when ILS inspection is\nenabled that may cause the device to reload during the processing of\na malformed ILS message. This vulnerability is triggered by transit\ntraffic only; traffic that is destined to the device does not trigger\nthis vulnerability. \n \n\nVulnerability Scoring Details\n+----------------------------\n\nCisco has provided scores for the vulnerabilities in this advisory\nbased on the Common Vulnerability Scoring System (CVSS). The CVSS\nscoring in this Security Advisory is done in accordance with CVSS\nversion 2.0. \n\nCVSS is a standards-based scoring method that conveys vulnerability\nseverity and helps determine urgency and priority of response. \n\nCisco has provided a base and temporal score. Customers can then\ncompute environmental scores to assist in determining the impact of\nthe vulnerability in individual networks. \n\nCisco has provided an FAQ to answer additional questions regarding\nCVSS at:\n\nhttp://www.cisco.com/web/about/security/intelligence/cvss-qandas.html\n\nCisco has also provided a CVSS calculator to help compute the\nenvironmental impact for individual networks at:\n\nhttp://intellishield.cisco.com/security/alertmanager/cvss\n\n* CSCti83875 -- Syslog message 302015 may lead to memory corruption and CP lockup\n\nCVSS Base Score - 7.8\n Access Vector - Network\n Access Complexity - Low\n Authentication - None\n Confidentiality Impact - None\n Integrity Impact - None\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.4\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\n\n* CSCtn15697 -- FWSM crash in thread name uauth \n\nCVSS Base Score - 7.8\n Access Vector - Network\n Access Complexity - Low\n Authentication - None\n Confidentiality Impact - None\n Integrity Impact - None\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.4\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\n\n* CSCto74274 -- Crafted TACACS+ reply considered as successful auth by FWSM\n\nCVSS Base Score - 7.9\n Access Vector - Adjacent Network\n Access Complexity - Medium\n Authentication - None\n Confidentiality Impact - Complete\n Integrity Impact - Complete\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.5\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\n\n* SunRPC Inspection Denial of Service Vulnerabilities\n\nCVSS Base Score - 7.8\n Access Vector - Network\n Access Complexity - Low\n Authentication - None\n Confidentiality Impact - None\n Integrity Impact - None\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.4\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\n\n* CSCtq57802 -- ILS inspection crash on malformed ILS traffic\n\nCVSS Base Score - 7.8\n Access Vector - Network\n Access Complexity - Low\n Authentication - None\n Confidentiality Impact - None\n Integrity Impact - None\n Availability Impact - Complete\n\nCVSS Temporal Score - 6.4\n Exploitability - Functional\n Remediation Level - Official-Fix\n Report Confidence - Confirmed\n\n\nImpact\n======\n\nSuccessful exploitation of any of the denial of service\nvulnerabilities could cause an affected device to reload. Repeated\nexploitation could result in a sustained denial of service condition. \n\nSuccessful exploitation of the TACACS+ authentication bypass\nvulnerability could allow an attacker to bypass authentication of\nVPN, firewall, and/or administrative sessions. \n \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult:\nhttp://www.cisco.com/go/psirt and any subsequent advisories to \ndetermine exposure and a complete upgrade solution. \n\nIn all cases, customers should exercise caution to be certain the\ndevices to be upgraded contain sufficient memory and that current\nhardware and software configurations will continue to be supported\nproperly by the new release. If the information is not clear, contact\nthe Cisco Technical Assistance Center (TAC) or your contracted\nmaintenance provider for assistance. \n\nEach row of the following Cisco FWSM Software table describes a major\nCisco FWSM Software train and the earliest possible release in that\ntrain that contains the fix (the \"First Fixed Release\") and the\nanticipated date of availability (if not currently available) in the\nFirst Fixed Release column. A device that is running a release that\nis earlier than the release in a specific column (earlier than the\nFirst Fixed Release) is known to be vulnerable. A vulnerable release\nshould be upgraded to the indicated release at a minimum, or a later\nversion (later than or equal to the First Fixed Release label). \n \n\nWorkarounds\n===========\n\nThis Cisco Security Advisory describes multiple distinct\nvulnerabilities. These vulnerabilities and their respective\nworkarounds are independent of each other. \n\nSyslog Message Memory Corruption Denial of Service Vulnerability\n+---------------------------------------------------------------\n\nCompletely disabling syslog 302015 with the command no logging\nmessage 302015 is an effective workaround for this vulnerability. \n\nAuthentication Proxy Denial of Service Vulnerability\n+---------------------------------------------------\n\nThere are no workarounds available for this vulnerability. \n\nTACACS+ Authentication Bypass Vulnerability\n+------------------------------------------\n\nThere are no workarounds available for this vulnerability other than\nusing a different authentication protocol such as RADIUS and LDAP. \n\nSunRPC Inspection Denial of Service Vulnerabilities\n+--------------------------------------------------\n\nAdministrators can mitigate these vulnerabilities by disabling SunRPC\ninspection if it is not required. Administrators can disable SunRPC\ninspection by issuing the no inspect sunrpc command in class\nconfiguration sub-mode in the policy map configuration. Disabling\nSunRPC inspection may cause SunRPC traffic to stop transiting the\nsecurity appliance. \n\nILS Inspection Denial of Service Vulnerability\n+---------------------------------------------\n\nAdministrators can mitigate this vulnerability by disabling ILS\ninspection if it is not required. Administrators can disable ILS\ninspection by issuing the no inspect ils command in class\nconfiguration sub-mode in the policy map configuration. Disabling ILS\ninspection may cause ILS traffic to stop through the security\nappliance. \n \n\nObtaining Fixed Software\n========================\n\nCisco has released free software updates that address these\nvulnerabilities. Prior to deploying software, customers should\nconsult their maintenance provider or check the software for feature\nset compatibility and known issues specific to their environment. \n\nCustomers may only install and expect support for the feature sets\nthey have purchased. By installing, downloading, accessing or\notherwise using such software upgrades, customers agree to be bound\nby the terms of Cisco\u0027s software license terms found at:\nhttp://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html \nor as otherwise set forth at Cisco.com Downloads at:\nhttp://www.cisco.com/public/sw-center/sw-usingswc.shtml\n\nDo not contact psirt@cisco.com or security-alert@cisco.com for\nsoftware upgrades. \n\n \nCustomers with Service Contracts\n+-------------------------------\n\nCustomers with contracts should obtain upgraded software through\ntheir regular update channels. For most customers, this means that\nupgrades should be obtained through the Software Center on Cisco\u0027s\nworldwide website at http://www.cisco.com\n\n \nCustomers using Third Party Support Organizations\n+------------------------------------------------\n\nCustomers whose Cisco products are provided or maintained through\nprior or existing agreements with third-party support organizations,\nsuch as Cisco Partners, authorized resellers, or service providers\nshould contact that support organization for guidance and assistance\nwith the appropriate course of action in regards to this advisory. \n\nThe effectiveness of any workaround or fix is dependent on specific\ncustomer situations, such as product mix, network topology, traffic\nbehavior, and organizational mission. Due to the variety of affected\nproducts and releases, customers should consult with their service\nprovider or support organization to ensure any applied workaround or\nfix is the most appropriate for use in the intended network before it\nis deployed. \n\n \nCustomers without Service Contracts\n+----------------------------------\n\nCustomers who purchase direct from Cisco but do not hold a Cisco\nservice contract, and customers who purchase through third-party\nvendors but are unsuccessful in obtaining fixed software through\ntheir point of sale should acquire upgrades by contacting the Cisco\nTechnical Assistance Center (TAC). TAC contacts are as follows. \n\n * +1 800 553 2447 (toll free from within North America)\n * +1 408 526 7209 (toll call from anywhere in the world)\n * e-mail: tac@cisco.com\n\nCustomers should have their product serial number available and be\nprepared to give the URL of this notice as evidence of entitlement to\na free upgrade. Free upgrades for non-contract customers must be\nrequested through the TAC. \n\nRefer to \nhttp://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html \nfor additional TAC contact information, including localized telephone \nnumbers, and instructions and e-mail addresses for use in various languages. \n \n\nExploitation and Public Announcements\n=====================================\n\nThe Cisco PSIRT is not aware of any public announcements or malicious\nuse of the vulnerabilities described in this advisory. \n\nThe Syslog Message Memory Corruption Denial of Service Vulnerability,\nAuthentication Proxy Denial of Service Vulnerability, and TACACS+\nAuthentication Bypass Vulnerability were discovered during the\ntroubleshooting of customer service requests. \n\nThe SunRPC Inspection Denial of Service Vulnerabilities and ILS\nInspection Denial of Service Vulnerability were discovered by Cisco\nduring internal testing. \n \n\nStatus of this Notice: FINAL\n============================\n\nTHIS DOCUMENT IS PROVIDED ON AN \"AS IS\" BASIS AND DOES NOT IMPLY ANY\nKIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF\nMERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE\nINFORMATION ON THE DOCUMENT OR MATERIALS LINKED FROM THE DOCUMENT IS\nAT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS\nDOCUMENT AT ANY TIME. \n\nA stand-alone copy or Paraphrase of the text of this document that\nomits the distribution URL in the following section is an\nuncontrolled copy, and may lack important information or contain\nfactual errors. \n \n\nDistribution\n============\n\nThis advisory is posted on Cisco\u0027s worldwide website at:\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20111005-fwsm.shtml\n\nIn addition to worldwide web posting, a text version of this notice\nis clear-signed with the Cisco PSIRT PGP key and is posted to the\nfollowing e-mail and Usenet news recipients. \n\n * cust-security-announce@cisco.com\n * first-bulletins@lists.first.org\n * bugtraq@securityfocus.com\n * vulnwatch@vulnwatch.org\n * cisco@spot.colorado.edu\n * cisco-nsp@puck.nether.net\n * full-disclosure@lists.grok.org.uk\n * comp.dcom.sys.cisco@newsgate.cisco.com\n\nFuture updates of this advisory, if any, will be placed on Cisco\u0027s\nworldwide website, but may or may not be actively announced on\nmailing lists or newsgroups. Users concerned about this problem are\nencouraged to check the above URL for any updates. \n \n\nRevision History\n================\n\n+---------------------------------------+\n| Revision | | Initial |\n| 1.0 | 2011-October-05 | public |\n| | | release. |\n+---------------------------------------+\n\n \n\nCisco Security Procedures\n=========================\n\nComplete information on reporting security vulnerabilities in Cisco\nproducts, obtaining assistance with security incidents, and\nregistering to receive security information from Cisco, is available\non Cisco\u0027s worldwide website at:\nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html\nThis includes instructions for press inquiries regarding Cisco security notices. \nAll Cisco security advisories are available at:\nhttp://www.cisco.com/go/psirt\n\n+--------------------------------------------------------------------\nCopyright 2010-2011 Cisco Systems, Inc. All rights reserved. \n+--------------------------------------------------------------------\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1.4.5 (SunOS)\n\niFcDBQFOjHRIQXnnBKKRMNARCAUrAP9BnUYauwq7OzqUJRuoVjBLn6T2Qh3S/LRn\ne0k/AYOr8AD/T7EQ/K8N+bAPmYBoJxsERyDGg80x/pxfRWFBd1s2+nE=\n=hr9R\n-----END PGP SIGNATURE-----\n\n_______________________________________________\nFull-Disclosure - We believe in it. \nCharter: http://lists.grok.org.uk/full-disclosure-charter.html\nHosted and sponsored by Secunia - http://secunia.com/\n",
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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