Cisco Firewall Services Module SIP denial of service

cisco-fwsm-sip-dos (32501) The risk level is classified as MediumMedium Risk

Description:

Cisco Firewall Services Module (FWSM) is vulnerable to a denial of service caused by improper handling of malformed SIP messages. If deep packet inspection of SIP messages is enabled, a remote attacker could send malformed SIP messages to cause the device to reload.

Note: By default SIP inspection is enabled in the 2.3.x series and before. SIP in the 3.x series and later is disabled by default.

*CVSS:

Base Score: 4
  Access Vector: Remote
  Access Complexity: High
  Authentication: Not Required
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 3
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to cisco-sa-20070214-fwsm for patch, upgrade, or suggested workaround information. See References.

References:

  • cisco-sa-20070214-fwsm: Cisco Security Advisory: Multiple Vulnerabilities in Firewall Services Module.
  • BID-22561: Cisco Multiple Products Multiple Remote Denial Of Service Vulnerabilities
  • BID-22562: Cisco PIX/ASA Privilege Escalation Vulnerability
  • CVE-2007-0961: Cisco PIX 500 and ASA 5500 Series Security Appliances 6.x before 6.3(5.115), 7.0 before 7.0(5.2), and 7.1 before 7.1(2.5), and the FWSM 3.x before 3.1(3.24), when the inspect sip option is enabled, allows remote attackers to cause a denial of service (device reboot) via malformed SIP packets.
  • OSVDB ID: 33054: Cisco PIX / ASA inspect sip Malformed SIP Packet DoS
  • SA24160: Cisco PIX and ASA Privilege Escalation and Denial of Service
  • SA24179: Cisco PIX SIP Inspection Denial of Service
  • SA24180: Cisco Firewall Services Module SIP DoS and ACL Corruption
  • SECTRACK ID: 1017651: Cisco ASA Lets Remote Users Deny Service and Remote Authenticated Users Gain Elevated Privileges
  • SECTRACK ID: 1017652: Cisco PIX Firewall Lets Remote Users Deny Service and Remote Authenticated Users Gain Elevated Privileges
  • US-CERT VU#430969: Cisco Firewall Services Module vulnerable to DoS via inspection of malformed SIP messages

Platforms Affected:

  • Cisco ASA 5500 6.3
  • Cisco ASA 5500 7.0
  • Cisco ASA 5500 7.1
  • Cisco ASA 5500 7.2
  • Cisco PIX 500 6.3
  • Cisco PIX 500 7.0
  • Cisco PIX 500 7.1
  • Cisco PIX 500 7.2

Reported:

Feb 14, 2007

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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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