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Apache: Buffer overflow in mod_ssl



[ GLSA 200406-05 ] Apache: Buffer overflow in mod_ssl

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Gentoo Linux Security Advisory                           GLSA 200406-05
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                                            http://security.gentoo.org/ 
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  Severity: High
     Title: Apache: Buffer overflow in mod_ssl
      Date: June 09, 2004
      Bugs: #51368
        ID: 200406-05

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Synopsis
========

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

Background
==========

Apache is the most popular Web server on the Internet. mod_ssl provides
Secure Sockets Layer encryption and authentication to Apache 1.3.
Apache 2 contains the functionality of mod_ssl.

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

    -------------------------------------------------------------------
     Package          /    Vulnerable    /                  Unaffected
    -------------------------------------------------------------------
  1  net-www/mod_ssl        < 2.8.18                         >= 2.8.18
  2  net-www/apache       <= 2.0.49-r2                           < 2.0
                                                          >= 2.0.49-r3
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

A bug in the function ssl_util_uuencode_binary in ssl_util.c may lead
to a remote buffer overflow on a server configured to use FakeBasicAuth
that will trust a client certificate with an issuing CA with a subject
DN longer than 6k.

Impact
======

Given the right server configuration, an attacker could cause a Denial
of Service or execute code as the user running Apache, usually
"apache". It is thought to be impossible to exploit this to execute
code on the x86 platform, but the possibility for other platforms is
unknown. This does not preclude a DoS on x86 systems.

Workaround
==========

A server should not be vulnerable if it is not configured to use
FakeBasicAuth and to trust a client CA with a long subject DN.

Resolution
==========

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

    # emerge sync

    # emerge -pv ">=net-www/modssl-2.8.18
    # emerge ">=net-www/modssl-2.8.18

Apache 2.x users should upgrade to the latest version of Apache:

    # emerge sync

    # emerge -pv ">=net-www/apache-2.0.49-r3"
    # emerge ">=net-www/apache-2.0.49-r3"

References
==========

  [ 1 ] CAN-2004-0488
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0488 

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

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

     http://security.gentoo.org/glsa/glsa-200406-05.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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