Cisco ASA 5500 Series Adaptive Security Appliances DHCP denial of service

Cisco-asasm-dhcp-dos (79176) The risk level is classified as MediumMedium Risk

Description:

Cisco ASA 5500 Series Adaptive Security Appliances (ASA) and Cisco Catalyst 6500 Series ASA Services Module (ASASM) are vulnerable to a denial of service, caused by a failure in allocating memory for an internal DHCP data structure upon receiving crafted DHCP packets. By sending specially-crafted DHCP packets, a remote attacker could exploit this vulnerability to cause the device to reload.

*CVSS:

Base Score: 7.1
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: None
  Integrity Impact: None
  Availability Impact: Complete
 
Temporal Score: 5.3
  Exploitability: Unproven
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Denial of Service

Remedy:

Refer to cisco-sa-20121010-asa for patch, upgrade or suggested workaround information. See References.

References:

  • cisco-sa-20121010-asa: Multiple Vulnerabilities in Cisco ASA 5500 Series Adaptive Security Appliances and Cisco Catalyst 6500 Series ASA Services Module .
  • BID-55861: Cisco ASA 5500 Series and Cisco Catalyst 6500 Series DHCP Denial of Service Vulnerability
  • CVE-2012-4643: The DHCP server on Cisco Adaptive Security Appliances (ASA) 5500 series devices, and the ASA Services Module (ASASM) in Cisco Catalyst 6500 series devices, with software 7.0 before 7.2(5.8), 7.1 before 7.2(5.8), 7.2 before 7.2(5.8), 8.0 before 8.0(5.28), 8.1 before 8.1(2.56), 8.2 before 8.2(5.27), 8.3 before 8.3(2.31), 8.4 before 8.4(3.10), 8.5 before 8.5(1.9), and 8.6 before 8.6(1.5) does not properly allocate memory for DHCP packets, which allows remote attackers to cause a denial of service (device reload) via a series of crafted IPv4 packets, aka Bug ID CSCtw84068.
  • OSVDB ID: 86145: Cisco Multiple Product DHCP Memory Allocation DHCP Request Parsing Remote DoS
  • SA50871: Cisco ASA Products Multiple Vulnerabilities

Platforms Affected:

  • Cisco Adaptive Security Appliance 7.0
  • Cisco Adaptive Security Appliance 8.0
  • Cisco ASA 5500 Series Adaptive Security Appliance 8.4

Reported:

Oct 10, 2012

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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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