IBM WebSphere HTTP Host: header buffer overflow

websphere-host-header-bo (10140) The risk level is classified as LowLow Risk


IBM WebSphere is vulnerable to a denial of service attack, caused by a buffer overflow that can occur when handling large HTTP headers. By sending an HTTP request for a .jsp file with an overly large HTTP Host: header, a remote attacker could overflow a buffer and cause the Web service to crash. The Web service may need to be restarted to regain normal functionality.

Note: This vulnerability may also be exploited using other large HTTP header fields, but it is unknown whether it can be exploited to execute code on the server.


Denial of Service


Upgrade to the latest version of IBM WebSphere (4.0.4 or later), as listed in IBM eFix (APAR): PQ62144. See References.

Apply the PQ62144 patch, available from the IBM Web site. See References.


Platforms Affected:

  • IBM WebSphere Application Server 4.0.1
  • IBM WebSphere Application Server 4.0.2
  • IBM WebSphere Application Server 4.0.3


Sep 19, 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.

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