VAR-200909-0384

Vulnerability from variot - Updated: 2025-04-10 19:49

Unspecified vulnerability in Cisco IOS 12.2XNA, 12.2XNB, 12.2XNC, 12.2XND, 12.4T, 12.4XZ, and 12.4YA, when Zone-Based Policy Firewall SIP Inspection is enabled, allows remote attackers to cause a denial of service (device reload) via a crafted SIP transit packet, aka Bug ID CSCsr18691. Cisco IOS is prone to a remote denial-of-service vulnerability. An attacker can exploit this issue to cause an affected device to reload, denying service to legitimate users. This issue is being tracked by Cisco Bug ID CSCsr18691.

Cisco has released free software updates that address this vulnerability.

Workarounds that mitigate this vulnerability are available.

This advisory is posted at:

http://www.cisco.com/warp/public/707/cisco-sa-20090923-ios-fw.shtml

Note: The September 23, 2009, Cisco IOS Security Advisory bundled publication includes eleven Security Advisories. Each advisory lists the releases that correct the vulnerability or vulnerabilities detailed in the advisory. The following table lists releases that correct all Cisco IOS Software vulnerabilities that have been published on September 23, 2009, or earlier.

http://www.cisco.com/warp/public/707/cisco-sa-20090923-bundle.shtml

Individual publication links are in "Cisco Event Response: Semiannual Cisco IOS Software Advisory Bundled Publication" at the following link:

http://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep09.html

Affected Products

This vulnerability affects a limited number of Cisco IOS Software releases. Consult the "Software Versions and Fixes" section of this advisory for the details of affected releases.

Vulnerable Products +------------------

To determine the Cisco IOS Software release that is running on a Cisco product, administrators can log in to the device and issue the "show version" command to display the system banner. The system banner confirms that the device is running Cisco IOS Software by displaying text similar to "Cisco Internetwork Operating System Software" or "Cisco IOS Software." The image name displays in parentheses, followed by "Version" and the Cisco IOS Software release name. Other Cisco devices do not have the "show version" command or may provide different output.

The following example identifies a Cisco product that is running Cisco IOS Software Release 12.3(26) with an installed image name of C2500-IS-L:

Router#show version
Cisco Internetwork Operating System Software
IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright \xa9) 1986-2008 by cisco Systems, Inc. 
Compiled Mon 17-Mar-08 14:39 by dchih

<output truncated>

The following example identifies a Cisco product that is running Cisco IOS Software Release 12.4(20)T with an installed image name of C1841-ADVENTERPRISEK9-M:

Router#show version
Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright \xa9) 1986-2008 by Cisco Systems, Inc. 
Compiled Thu 10-Jul-08 20:25 by prod_rel_team

<output truncated>

Additional information about Cisco IOS Software release naming conventions is available in "White Paper: Cisco IOS Reference Guide" at the following link:

http://www.cisco.com/warp/public/620/1.html

The device is vulnerable if the configuration has either a layer 3 or layer 7 SIP application-specific policy configured, and these policies are applied to any firewall zone. To determine whether the device is running a vulnerable configuration, log in to the device and issue the command line interface (CLI) command "show policy-map type inspect zone-pair | include atch: access|protocol sip". If the output contains "Match: protocol sip", the device is vulnerable. If the output contains "Match: access-group number", then the device is only vulnerable "if", the referenced access list permits the SIP protocol (UDP port 5060, or TCP ports 5060 and 5061). The following example shows a vulnerable device configured with Cisco IOS Zone-Based Policy Firewall SIP inspection:

Router#show policy-map type inspect zone-pair | include atch: access|protocol sip
      Match: protocol sip
Router#

The following example shows a vulnerable device configured with SIP inspection by way of an applied access list:

Router#show policy-map type inspect zone-pair | include atch: access|protocol sip
      Match: access-group 102
Router#
Router#show access-list 102
Extended IP access list 102
    10 permit udp any any eq 5060
    20 permit tcp any any eq 5060
    30 permit tcp any any eq 5061
Router#

A device that is not configured for SIP inspection or does not support this configuration will return either a blank line or an error message. Products confirmed not vulnerable include:

  • Cisco PIX 500 Series Firewall
  • Cisco ASA 5500 Series Adaptive Security Appliance
  • Firewall Services Module (FWSM) for Catalyst 6500 Series Switches and 7600 Series Routers
  • Virtual Firewall (VFW) application on the multiservice blade (MSB) on the Cisco XR 12000 Series Router
  • Cisco ACE Application Control Engine Module
  • Cisco IOS devices NOT configured with Cisco IOS Zone-Based Policy Firewall SIP inspection.
  • Cisco IOS devices configured with legacy Cisco IOS Firewall Support for SIP (CBAC)
  • Cisco IOS XE Software
  • Cisco IOS XR Software

Details

Firewalls are networking devices that control access to the network assets of an organization. Firewalls are often positioned at the entrance points into networks. Cisco IOS software provides a set of security features that enable you to configure a simple or elaborate firewall policy, according to your particular requirements.

Vulnerability Scoring Details

Cisco has provided scores for the vulnerability 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

CSCsr18691 - Cisco IOS Software Zone-Based Policy Firewall

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 the vulnerability may result in a reload of the affected device. Repeated exploit attempts may result in a sustained DoS attack.

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 Cisco IOS software table (below) names a Cisco IOS release train. If a given release train is vulnerable, then the earliest possible releases that contain the fix (along with the anticipated date of availability for each, if applicable) are listed in the "First Fixed Release" column of the table. The "Recommended Release" column indicates the releases which have fixes for all the published vulnerabilities at the time of this Advisory. A device running a release in the given train that is earlier than the release in a specific column (less than the First Fixed Release) is known to be vulnerable. Cisco recommends upgrading to a release equal to or later than the release in the "Recommended Releases" column of the table.

+-------------------------------------------------------------------+ | Major Release | Availability of Repaired Releases | |-----------------+-------------------------------------------------| | Affected | | | | 12.0-Based | First Fixed Release | Recommended Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.0 based releases | |-------------------------------------------------------------------| | Affected | | | | 12.1-Based | First Fixed Release | Recommended Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.1 based releases | |-------------------------------------------------------------------| | Affected | | | | 12.2-Based | First Fixed Release | Recommended Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.2 based releases | |-------------------------------------------------------------------| | Affected | | | | 12.3-Based | First Fixed Release | Recommended Release | | Releases | | | |-------------------------------------------------------------------| | There are no affected 12.3 based releases | |-------------------------------------------------------------------| | Affected | | | | 12.4-Based | First Fixed Release | Recommended Release | | Releases | | | |-----------------+---------------------------+---------------------| | 12.4 | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4GC | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4JA | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4JDA | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4JDC | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4JDD | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4JK | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4JL | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4JMA | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4JMB | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4JX | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4MD | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4MDA | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4MR | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4SW | Not Vulnerable | | |-----------------+---------------------------+---------------------| | | Releases prior to 12.4 | 12.4(20)T4 | | | (20)T are not vulnerable; | | | | | 12.4(22)T3 | | 12.4T | 12.4(20)T2 | | | | | 12.4(24)T2; | | | 12.4(22)T1 | Available on | | | | 23-OCT-2009 | | | 12.4(24)T | | |-----------------+---------------------------+---------------------| | 12.4XA | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XB | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XC | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XD | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XE | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XF | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XG | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XJ | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XK | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XL | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XM | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XN | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XP | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XQ | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XR | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XT | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XV | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XW | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4XY | Not Vulnerable | | |-----------------+---------------------------+---------------------| | | | 12.4(20)T4 | | | | | | | Vulnerable; first fixed | 12.4(22)T3 | | 12.4XZ | in 12.4T | | | | | 12.4(24)T2; | | | | Available on | | | | 23-OCT-2009 | |-----------------+---------------------------+---------------------| | | | 12.4(22)T3 | | | Vulnerable; first fixed | | | 12.4YA | in 12.4T | 12.4(24)T2; | | | | Available on | | | | 23-OCT-2009 | |-----------------+---------------------------+---------------------| | | | 12.4(22)YB4 | | | | | | 12.4YB | 12.4(22)YB4 | 12.4(22)YB5; | | | | Available on | | | | 19-OCT-2009 | |-----------------+---------------------------+---------------------| | 12.4YD | Not Vulnerable | | |-----------------+---------------------------+---------------------| | 12.4YE | Not Vulnerable | | +-------------------------------------------------------------------+

Workarounds

The only workaround for this vulnerability is to disable Cisco IOS zone-based policy firewall SIP inspection in the affected device's configuration. Disabling SIP inspection will allow the rest of the firewall features to continue to function until a software upgrade can be implemented. All other firewall features will continue to perform normally. Disabling SIP Inspection will vary depending on the implementation of the SIP inspection firewall.

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 vulnerability described in this advisory.

This vulnerability was discovered by Cisco 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-20090923-ios-fw.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 | 2009-September-23 | 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 -----BEGIN PGP SIGNATURE-----

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. ----------------------------------------------------------------------

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TITLE: Cisco IOS Multiple Vulnerabilities

SECUNIA ADVISORY ID: SA36835

VERIFY ADVISORY: http://secunia.com/advisories/36835/

DESCRIPTION: Some vulnerabilities have been reported in Cisco IOS, which can be exploited by malicious people to cause a DoS (Denial of Service), bypass certain security restrictions, disclose sensitive information, or compromise a vulnerable device.

1) An error exists in the login section of the Extension Mobility feature of the Cisco Unified CME (Communications Manager Express) component. This can be exploited to cause a buffer overflow via specially crafted HTTP requests.

Successful exploitation may allow execution of arbitrary code.

2) An error in the IKE implementation can be exploited to allocate all available Phase 1 SAs and prevent new IPSec sessions from being established.

Successful exploitation requires that the IKE certificate based authentication method is used.

3) Multiple errors exist in the IP tunnelling implementation when switching network packets.

Successful exploitation requires that the device is configured for PPTP, GRE, IPinIP, Generic Packet Tunneling in IPv6, or IPv6 over IP tunnels, and Cisco Express Forwarding.

4) An error in the implementation of the Object Groups for ACLs feature can be exploited to bypass access control policies.

5) An error in the H.323 implementation can be exploited to trigger a device reload via specially crafted TCP packets.

Successful exploitation requires that H.323 is enabled (disabled by default).

6) An error in the SIP implementation related to the Cisco Unified Border Element feature can be exploited to trigger a device reload.

For more information: SA36836

7) An error in the SSLVPN, SSH, and IKE Encrypted Nonces features can be exploited to reload a device via specially crafted packets sent to TCP ports 22 (for SSH) or 443 (for SSLVPN), or UDP ports 500 and 4500 (for IKE Encrypted Nonces).

8) A race condition error exists in the Authentication Proxy for HTTP(S), Web Authentication, and consent features. This can be exploited to bypass the authentication proxy services and the consent accept web page if a successfully authenticated session or accepted consent session exists. This can be exploited to reload a device via a specially crafted SIP transit packet.

10) An error exists in the NTPv4 implementation while creating NTP reply packets. This can be exploited to trigger a device reload via a specially crafted NTP packet.

SOLUTION: Update to a fixed version (please see the vendor's advisories for details).

PROVIDED AND/OR DISCOVERED BY: 1, 3-10) Reported by the vendor. 2) Reported to the vendor by a customer.

ORIGINAL ADVISORY: http://www.cisco.com/warp/public/707/cisco-sa-20090923-cme.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090923-ipsec.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090923-tunnels.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090923-acl.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090923-h323.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090923-sip.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090923-tls.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090923-auth-proxy.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090923-ios-fw.shtml http://www.cisco.com/warp/public/707/cisco-sa-20090923-ntp.shtml

OTHER REFERENCES: SA36836: http://secunia.com/advisories/36836/

About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.

Subscribe: http://secunia.com/advisories/secunia_security_advisories/

Definitions: (Criticality, Where etc.) http://secunia.com/advisories/about_secunia_advisories/

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    "data": "Unspecified vulnerability in Cisco IOS 12.2XNA, 12.2XNB, 12.2XNC, 12.2XND, 12.4T, 12.4XZ, and 12.4YA, when Zone-Based Policy Firewall SIP Inspection is enabled, allows remote attackers to cause a denial of service (device reload) via a crafted SIP transit packet, aka Bug ID CSCsr18691. Cisco IOS is prone to a remote denial-of-service vulnerability. \nAn attacker can exploit this issue to cause an affected device to reload, denying service to legitimate users. \nThis issue is being tracked by Cisco Bug ID CSCsr18691. \n\nCisco has released free software updates that address this\nvulnerability. \n\nWorkarounds that mitigate this vulnerability are available. \n\nThis advisory is posted at:\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-ios-fw.shtml\n\nNote: The September 23, 2009, Cisco IOS Security Advisory bundled\npublication includes eleven Security Advisories. Each advisory lists the releases that correct the\nvulnerability or vulnerabilities detailed in the advisory. The\nfollowing table lists releases that correct all Cisco IOS Software\nvulnerabilities that have been published on September 23, 2009, or\nearlier. \n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-bundle.shtml\n\nIndividual publication links are in \"Cisco Event Response: Semiannual\nCisco IOS Software Advisory Bundled Publication\" at the following\nlink:\n\nhttp://www.cisco.com/web/about/security/intelligence/Cisco_ERP_sep09.html\n\nAffected Products\n=================\n\nThis vulnerability affects a limited number of Cisco IOS Software\nreleases. Consult the \"Software Versions and Fixes\" section of this\nadvisory for the details of affected releases. \n\nVulnerable Products\n+------------------\n\nTo determine the Cisco IOS Software release that is running on a\nCisco product, administrators can log in to the device and issue the \n\"show version\" command to display the system banner. The system banner\nconfirms that the device is running Cisco IOS Software by displaying\ntext similar to \"Cisco Internetwork Operating System Software\" or\n\"Cisco IOS Software.\" The image name displays in parentheses,\nfollowed by \"Version\" and the Cisco IOS Software release name. Other\nCisco devices do not have the \"show version\" command or may provide\ndifferent output. \n\nThe following example identifies a Cisco product that is running\nCisco IOS Software Release 12.3(26) with an installed image name of\nC2500-IS-L:\n\n    Router#show version\n    Cisco Internetwork Operating System Software\n    IOS (tm) 2500 Software (C2500-IS-L), Version 12.3(26), RELEASE SOFTWARE (fc2)\n    Technical Support: http://www.cisco.com/techsupport\n    Copyright \\xa9) 1986-2008 by cisco Systems, Inc. \n    Compiled Mon 17-Mar-08 14:39 by dchih\n    \n    \u003coutput truncated\u003e\n\nThe following example identifies a Cisco product that is running\nCisco IOS Software Release 12.4(20)T with an installed image name of\nC1841-ADVENTERPRISEK9-M:\n\n    Router#show version\n    Cisco IOS Software, 1841 Software (C1841-ADVENTERPRISEK9-M), Version 12.4(20)T, RELEASE SOFTWARE (fc3)\n    Technical Support: http://www.cisco.com/techsupport\n    Copyright \\xa9) 1986-2008 by Cisco Systems, Inc. \n    Compiled Thu 10-Jul-08 20:25 by prod_rel_team\n    \n    \u003coutput truncated\u003e\n\nAdditional information about Cisco IOS Software release naming\nconventions is available in \"White Paper: Cisco IOS Reference Guide\"\nat the following link:\n\nhttp://www.cisco.com/warp/public/620/1.html\n\nThe device is vulnerable if the configuration has either a layer 3 or\nlayer 7 SIP application-specific policy configured, and these\npolicies are applied to any firewall zone. To determine whether the\ndevice is running a vulnerable configuration, log in to the device\nand issue the command line interface (CLI) command \"show policy-map\ntype inspect zone-pair | include atch: access|protocol sip\". If the\noutput contains \"Match: protocol sip\", the device is vulnerable. If\nthe output contains \"Match: access-group number\", then the device is\nonly vulnerable \"if\", the referenced access list permits the SIP\nprotocol (UDP port 5060, or TCP ports 5060 and 5061). The following\nexample shows a vulnerable device configured with Cisco IOS\nZone-Based Policy Firewall SIP inspection:\n\n    Router#show policy-map type inspect zone-pair | include atch: access|protocol sip\n          Match: protocol sip\n    Router#\n\nThe following example shows a vulnerable device configured with SIP\ninspection by way of an applied access list:\n\n    Router#show policy-map type inspect zone-pair | include atch: access|protocol sip\n          Match: access-group 102\n    Router#\n    Router#show access-list 102\n    Extended IP access list 102\n        10 permit udp any any eq 5060\n        20 permit tcp any any eq 5060\n        30 permit tcp any any eq 5061\n    Router#\n\nA device that is not configured for SIP inspection or does not\nsupport this configuration will return either a blank line or an\nerror message. Products confirmed not vulnerable include:\n\n  * Cisco PIX 500 Series Firewall\n  * Cisco ASA 5500 Series Adaptive Security Appliance\n  * Firewall Services Module (FWSM) for Catalyst 6500 Series Switches\n    and 7600 Series Routers\n  * Virtual Firewall (VFW) application on the multiservice blade\n    (MSB) on the Cisco XR 12000 Series Router\n  * Cisco ACE Application Control Engine Module\n  * Cisco IOS devices NOT configured with Cisco IOS Zone-Based Policy\n    Firewall SIP inspection. \n  * Cisco IOS devices configured with legacy Cisco IOS Firewall\n    Support for SIP (CBAC)\n  * Cisco IOS XE Software\n  * Cisco IOS XR Software\n\nDetails\n=======\n\nFirewalls are networking devices that control access to the network\nassets of an organization. Firewalls are often positioned at the\nentrance points into networks. Cisco IOS software provides a set of\nsecurity features that enable you to configure a simple or elaborate\nfirewall policy, according to your particular requirements. \n\nVulnerability Scoring Details\n=============================\n\nCisco has provided scores for the vulnerability 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\nCSCsr18691 - Cisco IOS Software Zone-Based Policy Firewall\n\nCVSS Base Score - 7.8\n\nAccess Vector           - Network\nAccess Complexity       - Low\nAuthentication          - None\nConfidentiality Impact  - None\nIntegrity Impact        - None\nAvailability Impact     - Complete\n\nCVSS Temporal Score - 6.4\n\nExploitability          - Functional\nRemediation Level       - Official-Fix\nReport Confidence       - Confirmed\n\nImpact\n======\n\nSuccessful exploitation of the vulnerability may result in a reload\nof the affected device. Repeated exploit attempts may result in a\nsustained DoS attack. \n\nSoftware Versions and Fixes\n===========================\n\nWhen considering software upgrades, also consult:\n\nhttp://www.cisco.com/go/psirt\n\nand any subsequent advisories to determine exposure and a complete\nupgrade 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 Cisco IOS software table (below) names a Cisco IOS\nrelease train. If a given release train is vulnerable, then the\nearliest possible releases that contain the fix (along with the\nanticipated date of availability for each, if applicable) are listed\nin the \"First Fixed Release\" column of the table. The \"Recommended\nRelease\" column indicates the releases which have fixes for all the\npublished vulnerabilities at the time of this Advisory. A device\nrunning a release in the given train that is earlier than the release\nin a specific column (less than the First Fixed Release) is known to\nbe vulnerable. Cisco recommends upgrading to a release equal to or\nlater than the release in the \"Recommended Releases\" column of the\ntable. \n\n+-------------------------------------------------------------------+\n|  Major Release  |        Availability of Repaired Releases        |\n|-----------------+-------------------------------------------------|\n|    Affected     |                           |                     |\n|   12.0-Based    |    First Fixed Release    | Recommended Release |\n|    Releases     |                           |                     |\n|-------------------------------------------------------------------|\n| There are no affected 12.0 based releases                         |\n|-------------------------------------------------------------------|\n|    Affected     |                           |                     |\n|   12.1-Based    |    First Fixed Release    | Recommended Release |\n|    Releases     |                           |                     |\n|-------------------------------------------------------------------|\n| There are no affected 12.1 based releases                         |\n|-------------------------------------------------------------------|\n|    Affected     |                           |                     |\n|   12.2-Based    |    First Fixed Release    | Recommended Release |\n|    Releases     |                           |                     |\n|-------------------------------------------------------------------|\n| There are no affected 12.2 based releases                         |\n|-------------------------------------------------------------------|\n|    Affected     |                           |                     |\n|   12.3-Based    |    First Fixed Release    | Recommended Release |\n|    Releases     |                           |                     |\n|-------------------------------------------------------------------|\n| There are no affected 12.3 based releases                         |\n|-------------------------------------------------------------------|\n|    Affected     |                           |                     |\n|   12.4-Based    |    First Fixed Release    | Recommended Release |\n|    Releases     |                           |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4            | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4GC          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4JA          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4JDA         | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4JDC         | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4JDD         | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4JK          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4JL          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4JMA         | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4JMB         | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4JX          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4MD          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4MDA         | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4MR          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4SW          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n|                 | Releases prior to 12.4    | 12.4(20)T4          |\n|                 | (20)T are not vulnerable; |                     |\n|                 |                           | 12.4(22)T3          |\n| 12.4T           | 12.4(20)T2                |                     |\n|                 |                           | 12.4(24)T2;         |\n|                 | 12.4(22)T1                | Available on        |\n|                 |                           | 23-OCT-2009         |\n|                 | 12.4(24)T                 |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XA          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XB          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XC          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XD          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XE          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XF          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XG          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XJ          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XK          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XL          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XM          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XN          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XP          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XQ          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XR          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XT          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XV          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XW          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4XY          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n|                 |                           | 12.4(20)T4          |\n|                 |                           |                     |\n|                 | Vulnerable; first fixed   | 12.4(22)T3          |\n| 12.4XZ          | in 12.4T                  |                     |\n|                 |                           | 12.4(24)T2;         |\n|                 |                           | Available on        |\n|                 |                           | 23-OCT-2009         |\n|-----------------+---------------------------+---------------------|\n|                 |                           | 12.4(22)T3          |\n|                 | Vulnerable; first fixed   |                     |\n| 12.4YA          | in 12.4T                  | 12.4(24)T2;         |\n|                 |                           | Available on        |\n|                 |                           | 23-OCT-2009         |\n|-----------------+---------------------------+---------------------|\n|                 |                           | 12.4(22)YB4         |\n|                 |                           |                     |\n| 12.4YB          | 12.4(22)YB4               | 12.4(22)YB5;        |\n|                 |                           | Available on        |\n|                 |                           | 19-OCT-2009         |\n|-----------------+---------------------------+---------------------|\n| 12.4YD          | Not Vulnerable            |                     |\n|-----------------+---------------------------+---------------------|\n| 12.4YE          | Not Vulnerable            |                     |\n+-------------------------------------------------------------------+\n\nWorkarounds\n===========\n\nThe only workaround for this vulnerability is to disable Cisco IOS\nzone-based policy firewall SIP inspection in the affected device\u0027s\nconfiguration. Disabling SIP inspection will allow the rest of the\nfirewall features to continue to function until a software upgrade\ncan be implemented. All other firewall features will continue to\nperform normally. Disabling SIP Inspection will vary depending on the\nimplementation of the SIP inspection firewall. \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:\n\nhttp://www.cisco.com/en/US/docs/general/warranty/English/EU1KEN_.html\n\nor as otherwise set forth at Cisco.com Downloads at:\n\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\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\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\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:\n\nhttp://www.cisco.com/en/US/support/tsd_cisco_worldwide_contacts.html\n\nfor additional TAC contact information, including localized telephone\nnumbers, and instructions and e-mail addresses for use in various\nlanguages. \n\nExploitation and Public Announcements\n=====================================\n\nThe Cisco PSIRT is not aware of any public announcements or malicious\nuse of the vulnerability described in this advisory. \n\nThis vulnerability was discovered by Cisco internal testing. \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\nDistribution\n============\n\nThis advisory is posted on Cisco\u0027s worldwide website at :\n\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-ios-fw.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\nRevision History\n================\n\n+----------------------------------------+\n| Revision |                   | Initial |\n| 1.0      | 2009-September-23 | public  |\n|          |                   | release |\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:\n\nhttp://www.cisco.com/en/US/products/products_security_vulnerability_policy.html\n\nThis includes instructions for press inquiries regarding Cisco security\nnotices. All Cisco security advisories are available at:\n\nhttp://www.cisco.com/go/psirt\n-----BEGIN PGP SIGNATURE-----\n\niD8DBQFKukGO86n/Gc8U/uARAiwEAKCXGG7xSxS+kMllVPDdOacuAZV9vACfcVVG\n3Lm0u0kNPpfW4oxa9PNOUA8=\n=f0Hj\n-----END PGP SIGNATURE-----\n\n. ----------------------------------------------------------------------\n\nDo you have VARM strategy implemented?\n\n(Vulnerability Assessment Remediation Management)  \n\nIf not, then implement it through the most reliable vulnerability\nintelligence source on the market. \n\nImplement it through Secunia. \n\nFor more information visit:\nhttp://secunia.com/advisories/business_solutions/\n\nAlternatively request a call from a Secunia representative today to\ndiscuss how we can help you with our capabilities contact us at:\nsales@secunia.com\n\n----------------------------------------------------------------------\n\nTITLE:\nCisco IOS Multiple Vulnerabilities\n\nSECUNIA ADVISORY ID:\nSA36835\n\nVERIFY ADVISORY:\nhttp://secunia.com/advisories/36835/\n\nDESCRIPTION:\nSome vulnerabilities have been reported in Cisco IOS, which can be\nexploited by malicious people to cause a DoS (Denial of Service),\nbypass certain security restrictions, disclose sensitive information,\nor compromise a vulnerable device. \n\n1) An error exists in the login section of the Extension Mobility\nfeature of the Cisco Unified CME (Communications Manager Express)\ncomponent. This can be exploited to cause a buffer overflow via\nspecially crafted HTTP requests. \n\nSuccessful exploitation may allow execution of arbitrary code. \n\n2)  An error in the IKE implementation can be exploited to allocate\nall available Phase 1 SAs and prevent new IPSec sessions from being\nestablished. \n\nSuccessful exploitation requires that the IKE certificate based\nauthentication method is used. \n\n3) Multiple errors exist in the IP tunnelling implementation when\nswitching network packets. \n\nSuccessful exploitation requires that the device is configured for\nPPTP, GRE, IPinIP, Generic Packet Tunneling in IPv6, or IPv6 over IP\ntunnels, and Cisco Express Forwarding. \n\n4) An error in the implementation of the Object Groups for ACLs\nfeature can be exploited to bypass access control policies. \n\n5) An error in the H.323 implementation can be exploited to trigger a\ndevice reload via specially crafted TCP packets. \n\nSuccessful exploitation requires that H.323 is enabled (disabled by\ndefault). \n\n6) An error in the SIP implementation related to the Cisco Unified\nBorder Element feature can be exploited to trigger a device reload. \n\nFor more information:\nSA36836\n\n7) An error in the SSLVPN, SSH, and IKE Encrypted Nonces features can\nbe exploited to reload a device via specially crafted packets sent to\nTCP ports 22 (for SSH) or 443 (for SSLVPN), or UDP ports 500 and 4500\n(for IKE Encrypted Nonces). \n\n8) A race condition error exists in the Authentication Proxy for\nHTTP(S), Web Authentication, and consent features. This can be\nexploited to bypass the authentication proxy services and the consent\naccept web page if a successfully authenticated session or accepted\nconsent session exists. This can be exploited to reload a device via a\nspecially crafted SIP transit packet. \n\n10) An error exists in the NTPv4 implementation while creating NTP\nreply packets. This can be exploited to trigger a device reload via a\nspecially crafted NTP packet. \n\nSOLUTION:\nUpdate to a fixed version (please see the vendor\u0027s advisories for\ndetails). \n\nPROVIDED AND/OR DISCOVERED BY:\n1, 3-10) Reported by the vendor. \n2) Reported to the vendor by a customer. \n\nORIGINAL ADVISORY:\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-cme.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-ipsec.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-tunnels.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-acl.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-h323.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-sip.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-tls.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-auth-proxy.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-ios-fw.shtml\nhttp://www.cisco.com/warp/public/707/cisco-sa-20090923-ntp.shtml\n\nOTHER REFERENCES:\nSA36836:\nhttp://secunia.com/advisories/36836/\n\n----------------------------------------------------------------------\n\nAbout:\nThis Advisory was delivered by Secunia as a free service to help\neverybody keeping their systems up to date against the latest\nvulnerabilities. \n\nSubscribe:\nhttp://secunia.com/advisories/secunia_security_advisories/\n\nDefinitions: (Criticality, Where etc.)\nhttp://secunia.com/advisories/about_secunia_advisories/\n\n\nPlease Note:\nSecunia recommends that you verify all advisories you receive by\nclicking the link. \nSecunia NEVER sends attached files with advisories. \nSecunia does not advise people to install third party patches, only\nuse those supplied by the vendor. \n\n----------------------------------------------------------------------\n\nUnsubscribe: Secunia Security Advisories\nhttp://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org\n\n----------------------------------------------------------------------\n\n\n",
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Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.