Cisco VPN 3000 series concentrators Windows PPTP client denial of service

cisco-vpn-pptp-dos (10021) 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 that occurs when handling requests from Windows Point-to-Point Tunneling Protocol (PPTP) clients. If a remote attacker using a Windows PPTP client with the "No Encryption" option set connects to an affected concentrator using "Encryption", the attacker could cause the concentrator to reload.


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), (3.0(Rel) or later), (2.5.2(F) 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-5625: Cisco VPN Concentrator PPTP Client Remote Denial Of Service Vulnerability
  • CVE-2002-1095: Cisco VPN 3000 Concentrator before 2.5.2(F), with encryption enabled, allows remote attackers to cause a denial of service (reload) via a Windows-based PPTP client with the No Encryption option set.
  • OSVDB ID: 8910: Cisco VPN 3000 Concentrator PPTP No Encryption Option Remote DoS

Platforms Affected:

  • Cisco Secure Access Control Server 2.6.3
  • 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 3002 Hardware Client

Reported:

Sep 03, 2002

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