Cisco VPN 3000 series concentrators long VPN username denial of service
| cisco-vpn-username-dos (10026) |  Low Risk |
Description:
Cisco VPN 3000 series concentrators are vulnerable to a denial of service attack, caused by a vulnerability regarding VPN client authentication. If a remote attacker using a VPN client attempts to log into the affected concentrator with an overly long username, the attacker could cause the concentrator to reload.
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 3000 Concentrator 3.5.3
- Cisco, VPN 3000 Concentrator 3.5.4
- Cisco, VPN 3000 Concentrator 3.6(Rel)
- Cisco, VPN 3002 Hardware Client
Remedy:
Upgrade to the latest software version for your device (3.6.1 or later) or (3.5.5 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-5620: Cisco VPN 3000 Series Concentrator Client Authentication Denial Of Service Vulnerability
- CVE-2002-1101: Cisco VPN 3000 Concentrator 2.2.x, 3.6(Rel), and 3.x before 3.5.5, allows remote attackers to cause a denial of service via a long user name.
Reported:
Sep 03, 2002
The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.
For corrections or additions please email xforce@iss.net