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Gentoo Linux Security Advisory                           GLSA 200407-18
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: mod_ssl: Format string vulnerability
      Date: July 22, 2004
      Bugs: #57379
        ID: 200407-18

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Synopsis
========

A bug in mod_ssl may allow a remote attacker to execute arbitrary code
when Apache is configured to use mod_ssl and mod_proxy.

Background
==========

mod_ssl provides Secure Sockets Layer encryption and authentication to
Apache 1.3.

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

    -------------------------------------------------------------------
     Package          /   Vulnerable   /                    Unaffected
    -------------------------------------------------------------------
  1  net-www/mod_ssl       <= 2.8.18                         >= 2.8.19

Description
===========

A bug in ssl_engine_ext.c makes mod_ssl vulnerable to a ssl_log()
related format string vulnerability in the mod_proxy hook functions.

Impact
======

Given the right server configuration, an attacker could execute code as
the user running Apache, usually "apache".

Workaround
==========

A server should not be vulnerable if it is not using both mod_ssl and
mod_proxy. Otherwise there is no workaround other than to disable
mod_ssl.

Resolution
==========

All mod_ssl users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-www/mod_ssl-2.8.19"
    # emerge ">=net-www/mod_ssl-2.8.19"

References
==========

  [ 1 ] mod_ssl Announcement
        http://marc.theaimsgroup.com/?l=apache-modssl&m=109001100906749&w=2

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

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

    http://security.gentoo.org/glsa/glsa-200407-18.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@g.o or alternatively, you may file a bug at
http://bugs.gentoo.org.

License
=======

Copyright 2004 Gentoo Foundation, 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