VAR-200505-1154
Vulnerability from variot - Updated: 2025-04-03 21:35Cisco IOS 12.0S through 12.3YH allows remote attackers to cause a denial of service (device restart) via a crafted IPv6 packet. A denial-of-service vulnerability exists in Cisco's Internetwork Operating System (IOS). This vulnerability may allow attackers to conduct denial-of-service attacks on an affected device. Cisco IOS In IPv6 Physical and logical interfaces due to improper handling of packets (6to4 Tunnel ) At IPv6 If you have enabled multiple invalid IPv6 A vulnerability exists in which a device is restarted by interpreting a packet.System disrupted service operation (DoS) May be in a state. This issue is due to a failure of the affected operating system to properly handle specially crafted network data. It is possible for an attacker to produce a sustained denial of service condition against an affected device by continually sending the malicious network data. An attacker may leverage this issue to cause an affected device to reload, denying service to legitimate users. Cisco IOS is the operating system that runs on many Cisco devices. -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
Technical Cyber Security Alert TA05-026A
Multiple Denial-of-Service Vulnerabilities in Cisco IOS
Original release date: January 26, 2005 Last revised: -- Source: US-CERT
Systems Affected
* Cisco routers and switches running IOS in various configurations
Overview
Several denial-of-service vulnerabilities have been discovered in Cisco's Internet Operating System (IOS).
I. Further details are available in the following vulnerability notes:
VU#583638 - Cisco IOS contains DoS vulnerability in MPLS packet processing
The IOS implementation of Multi Protocol Label Switching (MPLS) contains a vulnerability that allows malformed MPLS packets to cause an affected device to reload. An unauthenticated attacker can send these malformed packets on a local network segment that is connected to a vulnerable device interface. The vulnerability is exposed on both physical interfaces (i.e., hardware interfaces), and logical interfaces (i.e., software defined interfaces such as tunnels) that are configured for IPv6.
VU#689326 - Cisco IOS vulnerable to DoS via malformed BGP packet
An IOS device that is enabled for Border Gateway Protocol (BGP) and set up with the bgp log-neighbor-changes option is vulnerable to a denial-of-service attack via a malformed BGP packet.
II. Repeated exploitation of these vulnerabilites would result in a sustained denial-of-service condition.
Since devices running IOS may transit traffic for a number of other networks, the secondary impacts of a denial of service may be severe.
III. Solution
Upgrade to a fixed version of IOS
Cisco has updated versions of its IOS software to address these vulnerabilities. Please refer to the "Software Versions and Fixes" sections of the Cisco Security Advisories listed in Appendix A for more information on upgrading.
Workaround
Cisco has also published practical workarounds for VU#689326 and VU#583638. Please refer to the "Workarounds" section of each Cisco Security Advisory listed in Appendix A for more information.
Sites that are unable to install an upgraded version of IOS are encouraged to implement these workarounds.
Appendix A. References
* Cisco Security Advisory: Crafted Packet Causes Reload on Cisco
Routers -
<http://www.cisco.com/warp/public/707/cisco-sa-20050126-les.shtml>
* Cisco Security Advisory: Multiple Crafted IPv6 Packets Cause
Reload -
<http://www.cisco.com/warp/public/707/cisco-sa-20050126-ipv6.shtml>
* Cisco Security Advisory: Cisco IOS Malformed BGP Packet Causes
Reload -
<http://www.cisco.com/warp/public/707/cisco-sa-20050126-bgp.shtml>
* US-CERT Vulnerability Note VU#583638 -
<http://www.kb.cert.org/vuls/id/583638>
* US-CERT Vulnerability Note VU#472582 -
<http://www.kb.cert.org/vuls/id/472582>
* US-CERT Vulnerability Note VU#689326 -
<http://www.kb.cert.org/vuls/id/689326>
_________________________________________________________________
Feedback can be directed to the authors: Will Dormann, Chad Dougherty, and Damon Morda ___________
This document is available from: http://www.us-cert.gov/cas/techalerts/TA05-026A.html ___________
Copyright 2005 Carnegie Mellon University. Terms of use: http://www.us-cert.gov/legal.html ___________
Revision History
January 26, 2005: Initial release
Last updated January 26, 2005
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"data": "Cisco IOS 12.0S through 12.3YH allows remote attackers to cause a denial of service (device restart) via a crafted IPv6 packet. A denial-of-service vulnerability exists in Cisco\u0027s Internetwork Operating System (IOS). This vulnerability may allow attackers to conduct denial-of-service attacks on an affected device. Cisco IOS In IPv6 Physical and logical interfaces due to improper handling of packets (6to4 Tunnel ) At IPv6 If you have enabled multiple invalid IPv6 A vulnerability exists in which a device is restarted by interpreting a packet.System disrupted service operation (DoS) May be in a state. This issue is due to a failure of the affected operating system to properly handle specially crafted network data. \nIt is possible for an attacker to produce a sustained denial of service condition against an affected device by continually sending the malicious network data. \nAn attacker may leverage this issue to cause an affected device to reload, denying service to legitimate users. Cisco IOS is the operating system that runs on many Cisco devices. \n-----BEGIN PGP SIGNED MESSAGE-----\nHash: SHA1\n\n\n Technical Cyber Security Alert TA05-026A\n Multiple Denial-of-Service Vulnerabilities in Cisco IOS\n\n Original release date: January 26, 2005\n Last revised: --\n Source: US-CERT\n\nSystems Affected\n\n * Cisco routers and switches running IOS in various configurations\n\nOverview\n\n Several denial-of-service vulnerabilities have been discovered in\n Cisco\u0027s Internet Operating System (IOS). \n\nI. \n Further details are available in the following vulnerability notes:\n\n VU#583638 - Cisco IOS contains DoS vulnerability in MPLS packet\n processing\n\n The IOS implementation of Multi Protocol Label Switching (MPLS)\n contains a vulnerability that allows malformed MPLS packets to cause\n an affected device to reload. An unauthenticated attacker can send\n these malformed packets on a local network segment that is connected\n to a vulnerable device interface. The vulnerability is exposed on both\n physical interfaces (i.e., hardware interfaces), and logical\n interfaces (i.e., software defined interfaces such as tunnels) that\n are configured for IPv6. \n\n VU#689326 - Cisco IOS vulnerable to DoS via malformed BGP packet\n\n An IOS device that is enabled for Border Gateway Protocol (BGP) and\n set up with the bgp log-neighbor-changes option is vulnerable to a\n denial-of-service attack via a malformed BGP packet. \n\nII. Repeated exploitation of\n these vulnerabilites would result in a sustained denial-of-service\n condition. \n\n Since devices running IOS may transit traffic for a number of other\n networks, the secondary impacts of a denial of service may be severe. \n\nIII. Solution\n\nUpgrade to a fixed version of IOS\n\n Cisco has updated versions of its IOS software to address these\n vulnerabilities. Please refer to the \"Software Versions and Fixes\"\n sections of the Cisco Security Advisories listed in Appendix A for\n more information on upgrading. \n\nWorkaround\n\n Cisco has also published practical workarounds for VU#689326 and\n VU#583638. Please refer to the \"Workarounds\" section of each Cisco\n Security Advisory listed in Appendix A for more information. \n\n Sites that are unable to install an upgraded version of IOS are\n encouraged to implement these workarounds. \n\nAppendix A. References\n\n * Cisco Security Advisory: Crafted Packet Causes Reload on Cisco\n Routers -\n \u003chttp://www.cisco.com/warp/public/707/cisco-sa-20050126-les.shtml\u003e\n * Cisco Security Advisory: Multiple Crafted IPv6 Packets Cause\n Reload -\n \u003chttp://www.cisco.com/warp/public/707/cisco-sa-20050126-ipv6.shtml\u003e\n * Cisco Security Advisory: Cisco IOS Malformed BGP Packet Causes\n Reload -\n \u003chttp://www.cisco.com/warp/public/707/cisco-sa-20050126-bgp.shtml\u003e\n * US-CERT Vulnerability Note VU#583638 -\n \u003chttp://www.kb.cert.org/vuls/id/583638\u003e\n * US-CERT Vulnerability Note VU#472582 -\n \u003chttp://www.kb.cert.org/vuls/id/472582\u003e\n * US-CERT Vulnerability Note VU#689326 -\n \u003chttp://www.kb.cert.org/vuls/id/689326\u003e\n _________________________________________________________________\n\n Feedback can be directed to the authors: Will Dormann, Chad Dougherty,\n and Damon Morda\n _________________________________________________________________\n\n This document is available from:\n \u003chttp://www.us-cert.gov/cas/techalerts/TA05-026A.html\u003e\n _________________________________________________________________\n\n Copyright 2005 Carnegie Mellon University. \n Terms of use: \u003chttp://www.us-cert.gov/legal.html\u003e\n _________________________________________________________________\n\n Revision History\n\n January 26, 2005: Initial release\n\n\n Last updated January 26, 2005 \n\n-----BEGIN PGP SIGNATURE-----\nVersion: GnuPG v1.2.1 (GNU/Linux)\n\niQEVAwUBQfgfthhoSezw4YfQAQJQKAf8DxKPd+9aXGsomYzRhFPyCcnjEfy6dv/N\n3GcqV8GR5WyshB207vhvw1PDfZdQVFIXiNr/xE9dmBKEhm38En3a70DnVe2UCmXO\nUobYXGk9tSW+pnR7Cdd3hc8yeZq0ys+LFKF/sztgpPJji/zFWojPnuS1wCcYggA1\nkuGCQ9VD6My64Hlh/PStCYqx5C9azgGHNv086W6fQyCssgjwBz51YxdV9gZ9wJUt\nI8LGjq6T0Fp+5kEEd9SPoUjA+r7bNft3xUPAabb+N4dt8sZUYqzXDP71lYYXgZay\nz2FE7jkbtX/LYVQCiA4LfgGCbw1sI6p+UQABtj74CPte2CyJZO5hJw==\n=aHIO\n-----END PGP SIGNATURE-----\n",
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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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