Microsoft ISA Server Web Proxy denial of service

isa-web-proxy-dos (6383) The risk level is classified as MediumMedium Risk

Description:

Microsoft Internet Security and Acceleration (ISA) Server is vulnerable to a denial of service attack against the Web Proxy service. In versions of ISA with the Web Publishing feature enabled, a remote attacker can send an unusually long HTTP request to the Web Proxy service on port 80 to cause the service to fail. This results in preventing all incoming and outgoing Web traffic from passing through the firewall. The Web Proxy service must be restarted in order to regain normal functionality.

Platforms Affected:

  • Microsoft, ISA Server 2000

Remedy:

Apply the patch for this vulnerability, as listed in Microsoft Security Bulletin MS01-045. See References.

Note: Microsoft originally provided a patch for this vulnerability in MS01-021, but it was superseded by the patch released with MS01-045.

Consequences:

Denial of Service

References:

Reported:

Apr 16, 2001

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

Return to the main page