Cisco VPN 3000 series concentrators Windows PPTP client denial of service
| cisco-vpn-pptp-dos (10021) |  Low 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.
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
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.
Consequences:
Denial of Service
References:
- CIAC Information Bulletin M-119, Cisco VPN Concentrators and VPN 3002 Client Multiple Vulnerabilities at http://www.ciac.org/ciac/bulletins/m-119.shtml.
- vpn3k-multiple-vuln-pub, Cisco Security Advisory: Cisco VPN 3000 Concentrator Multiple Vulnerabilities at http://www.cisco.com/warp/public/707/vpn3k-multiple-vuln-pub.shtml.
- 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.
Reported:
Sep 03, 2002
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