Cisco ASA and PIX DHCP denial of service
| cisco-asa-dhcp-dos (34026) |  Low 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.
Platforms Affected:
- Cisco, Adaptive Security Appliance 7.2
- Cisco, PIX Firewall 7.2
Remedy:
Refer to cisco-sr-20070502-pix for patch, upgrade, or suggested workaround information. See References.
Consequences:
Denial of Service
References:
- cisco-sr-20070502-pix, Cisco Security Response: DHCP Relay Agent Vulnerability in Cisco PIX and ASA Appliances at http://www.cisco.com/warp/public/707/cisco-sr-20070502-pix.shtml.
- 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
- VUPEN/ADV-2007-1635: Cisco PIX and ASA DHCP Relay Agent Functionality Denial of Service Vulnerability
Reported:
May 02, 2007
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