[ GLSA 200406-16 ] Apache 1.3: Buffer overflow in mod_proxy

[Thierry Carrez <koon () gentoo org>]

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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

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