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Apache vulnerable to DoS

Vulnerability Note VU#206537

Original Release Date: 2003-04-08 | Last Revised: 2003-09-18

Overview

A remotely exploitable denial-of-service vulnerability exists in the Apache HTTP Server. Exploitation of this vulnerability may allow an attacker to consume all available system resources, resulting in a denial-of-service condition.

Description

The Apache HTTP Server is a very popular freely available web server that runs on a variety of operating systems, including UNIX, Linux, and Microsoft Windows (Win32).

A vulnerability exists in the way the Apache HTTP Server handles excessively large chunks of consecutive linefeed characters. Apache 2.0.44 (both the Windows & UNIX implementations) contains this vulnerability. Prior 2.x versions of Apache may contain the vulnerability. For more information, please see the iDEFENSE Advisory.

Impact

Exploitation of this vulnerability may allow an attacker to consume all available system resources, resulting in a denial-of-service condition.

Solution

Apply a patch from your vendor. If a patch is not available, you may wish to upgrade to Apache HTTP Server 2.0.45. The Apache Software Foundation has provided a patch as well.

Vendor Information

206537
 

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References

Acknowledgements

This vulnerability was discovered by iDEFENSE Inc. The CERT/CC thanks iDEFENSE Inc. for the information contained in their document, upon which this document is based.

This document was written by Ian A Finlay.

Other Information

CVE IDs: CVE-2003-0132
Severity Metric: 9.72
Date Public: 2003-04-08
Date First Published: 2003-04-08
Date Last Updated: 2003-09-18 15:39 UTC
Document Revision: 18

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