Gentoo Linux Security Advisory                           GLSA 200406-16
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                                             http://security.gentoo.org/
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  Severity: Normal
     Title: Apache 1.3: Buffer overflow in mod_proxy
      Date: June 21, 2004
      Bugs: #53544
        ID: 200406-16

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Synopsis
========

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

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.

Affected packages
=================

    -------------------------------------------------------------------
     Package         /    Vulnerable    /                   Unaffected
    -------------------------------------------------------------------
  1  net-www/apache      <= 1.3.31-r1                     >= 1.3.31-r2

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".

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:

    # emerge sync

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

References
==========

  [ 1 ] Georgi Guninski security advisory #69, 2004
         http://www.guninski.com/modproxy1.html
  [ 2 ] CAN-2004-0492
         http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0492

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

      http://security.gentoo.org/glsa/glsa-200406-16.xml

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at 
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Technologies, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
 
http://creativecommons.org/licenses/by-sa/1.0