Cisco VPN 3000 series concentrators HTML interface denial of service

cisco-vpn-html-interface-dos (10025) 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 handling of malformed HTML pages. A remote attacker could modify an HTML page by inserting an overly long username and password, which would cause the affected concentrator to reload when the malformed page is submitted.


Consequences:

Denial of Service

Remedy:

Upgrade to the latest software version for your device (3.6(Rel) or later) or (3.5.3 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-5617: Cisco VPN 3000 Series Concentrator Posted User Credential Denial Of Service Vulnerability
  • CVE-2002-1100: Cisco VPN 3000 Concentrator 2.2.x, and 3.x before 3.5.3, allows remote attackers to cause a denial of service (crash) via a long (1) username or (2) password to the HTML login interface.
  • OSVDB ID: 8922: Cisco VPN 3000 Concentrator HTML Login Processing User Credential Overflow 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
  • 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 3002 Hardware Client

Reported:

Sep 03, 2002

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