Cisco VPN 3000 series concentrators HTML parser denial of service
| cisco-vpn-html-parser-dos (10018) |  Low Risk |
Description:
Cisco VPN 3000 series concentrators are vulnerable to a denial of service attack, caused by a vulnerability in the HTML parser. A remote attacker could send an overly long HTTP request to the server to consume 100% of the available CPU resources, which would cause the server to stop responding. The device would regain normal functionality after about 5 minutes.
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
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), or (3.0.3(B) 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-5615: Cisco HTTP Interface Long Request Denial Of Service Vulnerability
- CVE-2002-1093: HTML interface for Cisco VPN 3000 Concentrator 2.x.x and 3.x.x before 3.0.3(B) allows remote attackers to cause a denial of service (CPU consumption) via a long URL request.
Reported:
Sep 03, 2002
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