Cisco VPN 3000 series concentrators HTML parser denial of service

cisco-vpn-html-parser-dos (10018) 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 in the HTML parser. A remote attacker could send an overly long HTTP request to the server to consume 100% of the available CPU resources, which would cause the server to stop responding. The device would regain normal functionality after about 5 minutes.


Consequences:

Denial of Service

Remedy:

Upgrade to the latest software version for your device (3.6(Rel) or later), (3.5(Rel) or later), (3.1(Rel) or later), or (3.0.3(B) 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-5615: Cisco HTTP Interface Long Request Denial Of Service Vulnerability
  • CVE-2002-1093: HTML interface for Cisco VPN 3000 Concentrator 2.x.x and 3.x.x before 3.0.3(B) allows remote attackers to cause a denial of service (CPU consumption) via a long URL request.
  • OSVDB ID: 8908: Cisco VPN 3000 Concentrator HTML Interface Long URL DoS

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

Reported:

Sep 03, 2002

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