Cisco VPN 3000 series concentrators malformed ISAKMP packet denial of service

cisco-vpn-isakmp-dos (10028) The risk level is classified as MediumMedium Risk

Description:

Cisco VPN 3000 series concentrators are vulnerable to a denial of service attack, caused by a vulnerability regarding the handling of ISAKMP packets. A remote attacker could send overly large or malformed ISAKMP packets to an affected concentrator to cause the concentrator to reload.


Consequences:

Denial of Service

Remedy:

Upgrade to the latest software version for your device (3.6.1 or later) or (3.5.5 or later), as listed in Cisco Security Advisory: Cisco VPN 3000 Concentrator Multiple Vulnerabilities. See References.

References:

  • CIAC Information Bulletin M-119: Cisco VPN Concentrators and VPN 3002 Client Multiple Vulnerabilities.
  • vpn3k-multiple-vuln-pub: Cisco Security Advisory: Cisco VPN 3000 Concentrator Multiple Vulnerabilities.
  • BID-5609: Multiple Cisco VPN 3000 Vulnerabilities
  • BID-5619: Cisco VPN 3000 Series Concentrator ISAKMP Denial of Service Vulnerabilities
  • CVE-2002-1103: Cisco VPN 3000 Concentrator 2.2.x, 3.6(Rel), and 3.x before 3.5.5, allows remote attackers to cause a denial of service via (1) malformed or (2) large ISAKMP packets.
  • US-CERT VU#761651: Cisco VPN 3000 series concentrator does not properly handle malformed ISAKMP packets

Platforms Affected:

  • Cisco VPN 3000 Concentrator 2.0
  • Cisco VPN 3000 Concentrator 2.5.2.A
  • Cisco VPN 3000 Concentrator 2.5.2.B
  • Cisco VPN 3000 Concentrator 2.5.2.C
  • Cisco VPN 3000 Concentrator 2.5.2.D
  • Cisco VPN 3000 Concentrator 2.5.2.F
  • Cisco VPN 3000 Concentrator 3.0
  • Cisco VPN 3000 Concentrator 3.0(Rel)
  • Cisco VPN 3000 Concentrator 3.0.3.A
  • Cisco VPN 3000 Concentrator 3.0.3.B
  • Cisco VPN 3000 Concentrator 3.0.4
  • Cisco VPN 3000 Concentrator 3.1
  • Cisco VPN 3000 Concentrator 3.1(Rel)
  • Cisco VPN 3000 Concentrator 3.1.1
  • Cisco VPN 3000 Concentrator 3.1.2
  • Cisco VPN 3000 Concentrator 3.1.4
  • Cisco VPN 3000 Concentrator 3.5(Rel)
  • Cisco VPN 3000 Concentrator 3.5.1
  • Cisco VPN 3000 Concentrator 3.5.2
  • Cisco VPN 3000 Concentrator 3.5.3
  • Cisco VPN 3000 Concentrator 3.5.4
  • Cisco VPN 3000 Concentrator 3.6(Rel)
  • Cisco VPN 3002 Hardware Client

Reported:

Sep 03, 2002

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 the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

For corrections or additions please email xforce@iss.net

Return to the main page