Cisco ASA SSL VPN denial of service

cisco-asa-sslvpn-dos (44868) The risk level is classified as MediumMedium Risk

Description:

Cisco ASA devices are vulnerable to a denial of service, caused by a memory leak error when configured to terminate clientless VPN connections. A remote attacker could exploit this vulnerability using a specially-crafted SSL 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-2008-2734: Memory leak in the crypto functionality in Cisco 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 clientless SSL VPN endpoint, allows remote attackers to cause a denial of service (memory consumption and VPN hang) via a crafted SSL or HTTP packet, aka Bug ID CSCso66472.
  • OSVDB ID: 47922: Cisco PIX / ASA SSL VPN Crafted Packet Remote Memory Leak Remote DoS
  • SA31730: Cisco ASA and PIX Security Appliances Multiple Vulnerabilities
  • SECTRACK ID: 1020812: Cisco ASA SSL VPN Bugs Let Remote Users Deny Service

Platforms Affected:

  • Cisco Adaptive Security Appliance 7.2
  • Cisco Adaptive Security Appliance 8.0
  • Cisco Adaptive 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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