Apache 1.3: Buffer overflow in mod_proxy

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200406-16 / Apache
Release Date	June 21, 2004
Latest Revision	December 30, 2007: 02
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
www-servers/apache	<= 1.3.31-r1	>= 1.3.31-r2	All supported architectures

Related bugreports: #53544

Synopsis

A bug in mod_proxy may allow a remote attacker to execute arbitrary code when Apache is configured a certain way.

2. Impact Information

Background

The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems. The goal of this project is to provide a secure, efficient and extensible server that provides services in tune with the current HTTP standards.

Description

A bug in the proxy_util.c file may lead to a remote buffer overflow. To trigger the vulnerability an attacker would have to get mod_proxy to connect to a malicous server which returns an invalid (negative) Content-Length.

Impact

An attacker could cause a Denial of Service as the Apache child handling the request, which will die and under some circumstances execute arbitrary code as the user running Apache, usually "apache".

3. Resolution Information

Workaround

There is no known workaround at this time. All users are encouraged to upgrade to the latest available version:

Resolution

Apache 1.x users should upgrade to the latest version of Apache:

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv ">=www-servers/apache-1.3.31-r2"
# emerge ">=www-servers/apache-1.3.31-r2"

4. References

Page updated June 21, 2004

Summary: This is a Gentoo Linux Security Advisory

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