Cisco VPN 3000 series concentrators long VPN username denial of service
| cisco-vpn-username-dos (10026) |  Medium 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.
Consequences:
Denial of Service
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.
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-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.
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
Reported:
Sep 03, 2002
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