Cisco IOS Intrusion Prevention System denial of service

ciscoios-ips-dos (78882) The risk level is classified as MediumMedium Risk

Description:

Cisco IOS is vulnerable to a denial of service, caused by an error in the Intrusion Prevention System implementation. By sending a specially-crafted DNS packet, a remote attacker could exploit this vulnerability to cause the device to reload.

*CVSS:

Base Score: 7.8
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 5.8
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to cisco-sa-20120926-ios-ips for patch, upgrade or suggested workaround information. See References.

References:

  • cisco-sa-20120926-ios-ips: Cisco IOS Software Intrusion Prevention System Denial of Service Vulnerability.
  • BID-55695: Cisco IOS CVE-2012-3950 Remote Denial of Service Vulnerability
  • CVE-2012-3950: The Intrusion Prevention System (IPS) feature in Cisco IOS 12.3 through 12.4 and 15.0 through 15.2, in certain configurations of enabled categories and missing signatures, allows remote attackers to cause a denial of service (device reload) via DNS packets, aka Bug ID CSCtw55976.
  • OSVDB ID: 85815: Cisco IOS Intrusion Prevention System Malformed DNS Packet Parsing Remote DoS
  • SA50777: Cisco IOS Intrusion Prevention System DNS Packet Handling Denial of Service Vulnerability

Platforms Affected:

  • Cisco IOS 12.4
  • Cisco IOS 15.0
  • Cisco IOS 15.1
  • Cisco IOS 15.2

Reported:

Sep 26, 2012

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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