Cisco Content Switching Module (CSM) and Content Switching Module with SSL (CSM-S) denial of service

cisco-csm-csms-dos (42409) The risk level is classified as LowLow Risk

Description:

The Cisco Content Switching Module (CSM) and Content Switching Module with SSL (CSM-S) is vulnerable to a denial of service, caused by a memory leak error when layer 7 load balancing is enabled. By sending a specially-crafted TCP packet containing certain flags, a remote attacker could cause the utilization of all memory resources.

Platforms Affected:

  • Cisco, Content Switching Module 4.2(3)
  • Cisco, Content Switching Module 4.2(3a)
  • Cisco, Content Switching Module 4.2(4)
  • Cisco, Content Switching Module 4.2(5)
  • Cisco, Content Switching Module 4.2(6)
  • Cisco, Content Switching Module 4.2(7)
  • Cisco, Content Switching Module 4.2(8)
  • Cisco, Content Switching Module with SSL 2.1(2)
  • Cisco, Content Switching Module with SSL 2.1(3)
  • Cisco, Content Switching Module with SSL 2.1(4)
  • Cisco, Content Switching Module with SSL 2.1(5)
  • Cisco, Content Switching Module with SSL 2.1(6)
  • Cisco, Content Switching Module with SSL 2.1(7)

Remedy:

Refer to cisco-sa-20080514-csm for patch, upgrade or suggested workaround information. See References.

Consequences:

Denial of Service

References:

  • cisco-sa-20080514-csm, Cisco Security Advisory: Cisco Content Switching Module Memory Leak Vulnerability at http://www.cisco.com/warp/public/707/cisco-sa-20080514-csm.shtml.
  • BID-29216: Cisco Content Switching Module Layer 7 Load Balancing Denial of Service Vulnerability
  • CVE-2008-1749: Memory leak in Cisco Content Switching Module (CSM) 4.2(3) up to 4.2(8) and Cisco Content Switching Module with SSL (CSM-S) 2.1(2) up to 2.1(7) allows remote attackers to cause a denial of service (memory consumption) via TCP segments with an unspecified combination of TCP flags.
  • SA30223: Cisco Catalyst Content Switching Module Memory Leak Vulnerability

Reported:

May 14, 2008

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