Cisco ASA 5500 and PIX 500 TCP connection denial of service

cisco-asa-tcp-dos (56336) The risk level is classified as MediumMedium Risk

Description:

Cisco ASA 5500 and PIX 500 are vulnerable to a denial of service, caused by a TCP connection exhaustion condition. By sending specific TCP segments during the TCP connection termination phase following the three-way handshake, a remote attacker could exploit this vulnerability to caused a denial of service.

*CVSS:

Base Score: 7.1
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 5.9
  Exploitability: Functional
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to cisco-sa-20100217-asa for patch, upgrade or suggested workaround information. See References.

References:

  • cisco-sa-20100217-asa: Multiple Vulnerabilities in Cisco ASA 5500 Series Adaptive Security Appliances.
  • BID-38275: Cisco ASA Appliance TCP Connection Exhaustion Denial of Service Vulnerability
  • CVE-2010-0149: Unspecified vulnerability in Cisco ASA 5500 Series Adaptive Security Appliance 7.2 before 7.2(4.46), 8.0 before 8.0(4.38), 8.1 before 8.1(2.29), and 8.2 before 8.2(1.5); and Cisco PIX 500 Series Security Appliance; allows remote attackers to cause a denial of service (prevention of new connections) via crafted TCP segments during termination of the TCP connection that cause the connection to remain in CLOSEWAIT status, aka TCP Connection Exhaustion Denial of Service Vulnerability.
  • OSVDB ID: 62433: Cisco Multiple Products Series TCP Connection Exhaustion Remote DoS
  • SA38618: Cisco ASA 5500 Series Multiple Vulnerabilities
  • SA38636: Cisco PIX 500 Series Multiple Vulnerabilities
  • SECTRACK ID: 1023612: Cisco ASA TCP, SIP, SCCP, DTLS, and IKE Processing Flaws Let Remote Users Deny Service

Platforms Affected:

  • Cisco ASA 5500 7.2
  • Cisco ASA 5500 8.0
  • Cisco ASA 5500 8.1
  • Cisco ASA 5500 8.2
  • Cisco PIX 500

Reported:

Feb 17, 2010

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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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