Cisco PIX and ASA IPSec client authentication denial of service

cisco-pix-asa-ipsecclientauth-dos (44867) The risk level is classified as MediumMedium Risk

Description:

Cisco PIX and ASA devices are vulnerable to a denial of service, caused by an authentication processing vulnerability when configured to terminate client based VPN connections. A remote attacker could exploit this vulnerability using a specially-crafted authentication packet 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-20080903-asa for patch, upgrade or suggested workaround information. See References.

References:

  • cisco-sa-20080903-asa: Cisco Security Advisory: Remote Access VPN and SIP Vulnerabilities in Cisco PIX and Cisco ASA.
  • BID-30998: Cisco PIX and Cisco ASA Multiple Denial of Service and Information Disclosure Vulnerabilities
  • CVE-2008-2733: Cisco PIX and Adaptive Security Appliance (ASA) 5500 devices 7.2 before 7.2(4)2, 8.0 before 8.0(3)14, and 8.1 before 8.1(1)4, when configured as a client VPN endpoint, do not properly process IPSec client authentication, which allows remote attackers to cause a denial of service (device reload) via a crafted authentication attempt, aka Bug ID CSCso69942.
  • OSVDB ID: 47921: Cisco PIX / ASA IPSec Client Crafted Authentication Request Unspecified Issue
  • SA31730: Cisco ASA and PIX Security Appliances Multiple Vulnerabilities
  • SECTRACK ID: 1020810: Cisco ASA IPSec Authentication Processing Bug Lets Remote Users Deny Service
  • SECTRACK ID: 1020811: Cisco PIX IPSec Authentication Processing Bug Lets Remote Users Deny Service

Platforms Affected:

  • Cisco Adaptive Security Appliance 7.2
  • Cisco Adaptive Security Appliance 8.0
  • Cisco Adaptive Security Appliance 8.1
  • Cisco PIX Security Appliance 7.2
  • Cisco PIX Security Appliance 8.0
  • Cisco PIX Security Appliance 8.1

Reported:

Sep 03, 2008

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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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