Cisco ASA and PIX DHCP denial of service

cisco-asa-dhcp-dos (34026) The risk level is classified as MediumMedium Risk

Description:

Cisco Adaptive Security Appliance (ASA) and PIX security appliances are vulnerable to a denial of service caused by a vulnerability in the DHCP relay agent. If the DHCP relay agent is enabled on multiple connected systems, a remote attacker could exploit this vulnerability to consume system memory and cause the device to stop responding.

*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-sr-20070502-pix for patch, upgrade, or suggested workaround information. See References.

References:

  • cisco-sr-20070502-pix: Cisco Security Response: DHCP Relay Agent Vulnerability in Cisco PIX and ASA Appliances.
  • BID-23763: Cisco PIX/ASA DHCP Relay Remote Denial of Service Vulnerability
  • CVE-2007-2461: The DHCP relay agent in Cisco Adaptive Security Appliance (ASA) and PIX 7.2 allows remote attackers to cause a denial of service (dropped packets) via a DHCPREQUEST or DHCPINFORM message that causes multiple DHCPACK messages to be sent from DHCP servers to the agent, which consumes the memory allocated for a local buffer. NOTE: this issue only occurs when multiple DHCP servers are used.
  • OSVDB ID: 35330: Cisco PIX / ASA DHCP Relay Agent Crafted Message Remote DoS
  • SA25109: Cisco PIX and ASA Denial of Service and Security Bypass
  • SECTRACK ID: 1017999: Cisco ASA DHCP Relay Agent Lets Remote Users Deny Service
  • SECTRACK ID: 1018000: Cisco PIX Firewall DHCP Relay Agent Lets Remote Users Deny Service
  • US-CERT VU#530057: Cisco ASA fails to properly process DHCP relay packets

Platforms Affected:

  • Cisco Adaptive Security Appliance 7.2
  • Cisco PIX Firewall 7.2

Reported:

May 02, 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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