Cisco ASA and PIX DHCP denial of service
| cisco-asa-dhcp-dos (34026) |  Medium 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
- VUPEN/ADV-2007-1635: Cisco PIX and ASA DHCP Relay Agent Functionality Denial of Service Vulnerability
Platforms Affected:
- Cisco Adaptive Security Appliance 7.2
- Cisco PIX Firewall 7.2
Reported:
May 02, 2007
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For corrections or additions please email xforce@iss.net
* According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.
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.