VAR-200505-1149
Vulnerability from variot - Updated: 2025-04-03 19:32Cisco IOS 12.1T, 12.2, 12.2T, 12.3 and 12.3T, with Multi Protocol Label Switching (MPLS) installed but disabled, allows remote attackers to cause a denial of service (device reload) via a crafted packet sent to the disabled interface. 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. A vulnerability in the way Cisco IOS handles IPv6 packets could result in a remotely exploitable denial of service. It is reported that the vulnerability presents itself when an affected router handles an unspecified malicious packet on a MPLS disabled interface. A remote attacker that resides on the same network segment as the vulnerable router may exploit this vulnerability continuously to effectively deny network-based services to legitimate users. Cisco IOS is the operating system that runs on many Cisco devices. There is a problem in the processing of special MPLS packets in Cisco IOS 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. 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. Impact
Although the underlying causes of these three vulnerabilities is different, in each case a remote attacker could cause an affected device to reload the operating system. 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 12.1T, 12.2, 12.2T, 12.3 and 12.3T, with Multi Protocol Label Switching (MPLS) installed but disabled, allows remote attackers to cause a denial of service (device reload) via a crafted packet sent to the disabled interface. 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. A vulnerability in the way Cisco IOS handles IPv6 packets could result in a remotely exploitable denial of service. \nIt is reported that the vulnerability presents itself when an affected router handles an unspecified malicious packet on a MPLS disabled interface. \nA remote attacker that resides on the same network segment as the vulnerable router may exploit this vulnerability continuously to effectively deny network-based services to legitimate users. Cisco IOS is the operating system that runs on many Cisco devices. There is a problem in the processing of special MPLS packets in Cisco IOS 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. 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. Impact\n\n Although the underlying causes of these three vulnerabilities is\n different, in each case a remote attacker could cause an affected\n device to reload the operating system. 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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