Cisco VPN 3000 series concentrators malformed ISAKMP packet denial of service
| cisco-vpn-isakmp-dos (10028) |  Low Risk |
Description:
Cisco VPN 3000 series concentrators are vulnerable to a denial of service attack, caused by a vulnerability regarding the handling of ISAKMP packets. A remote attacker could send overly large or malformed ISAKMP packets to an affected concentrator to 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-5619: Cisco VPN 3000 Series Concentrator ISAKMP Denial of Service Vulnerabilities
- CVE-2002-1103: 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 (1) malformed or (2) large ISAKMP packets.
- US-CERT VU#761651: Cisco VPN 3000 series concentrator does not properly handle malformed ISAKMP packets
Reported:
Sep 03, 2002
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