Cisco VPN 3000 series concentrators with the XML filter enabled could allow unauthorized access

cisco-vpn-xml-filter (10023) The risk level is classified as MediumMedium Risk

Description:

Cisco VPN 3000 series with the XML filter configuration enabled could allow a remote attacker to bypass security and gain unauthorized access to the network. If the XML filter configuration has been enabled, the "HTTPS on Public Inbound (XML-Auto)(forward/in)" rule is added to the public filter and protocol value is incorrectly set to "ANY" with the destination port set as "443". This could allow a remote attacker to gain unauthorized access to the network since the concentrator would then permit any protocol to access the concentrator through any port.


Consequences:

Bypass Security

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-5614: Cisco VPN 3000 Series Concentrator XML Filter Misconfigured Access Vulnerability
  • CVE-2002-1098: Cisco VPN 3000 Concentrator 2.2.x, and 3.x before 3.5.3, adds an HTTPS on Public Inbound (XML-Auto)(forward/in) rule but sets the protocol to ANY when the XML filter configuration is enabled, which ultimately allows arbitrary traffic to pass through the concentrator.
  • OSVDB ID: 8913: Cisco VPN 3000 Concentrator XML Filter Configuration Fault Filter ACL Bypass

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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