[ GLSA 200409-21 ] Apache 2, mod_dav: Multiple vulnerabilities

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200409-21
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: Apache 2, mod_dav: Multiple vulnerabilities
      Date: September 16, 2004
      Bugs: #62626, #63948, #64145
        ID: 200409-21

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Synopsis
========

Several vulnerabilities have been found in Apache 2 and mod_dav for
Apache 1.3 which could allow a remote attacker to cause a Denial of
Service or a local user to get escalated privileges.

Background
==========

The Apache HTTP server is one of most popular web servers on the
internet. mod_ssl provides SSL v2/v3 and TLS v1 support for it and
mod_dav is the Apache module for Distributed Authoring and Versioning
(DAV).

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

    -------------------------------------------------------------------
     Package          /   Vulnerable   /                    Unaffected
    -------------------------------------------------------------------
  1  net-www/apache        < 2.0.51                          >= 2.0.51
                                                                 < 2.0
  2  net-www/mod_dav      <= 1.0.3-r1                      >= 1.0.3-r2
    -------------------------------------------------------------------
     2 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

A potential infinite loop has been found in the input filter of mod_ssl
(CAN-2004-0748) as well as a possible segmentation fault in the
char_buffer_read function if reverse proxying to a SSL server is being
used (CAN-2004-0751). Furthermore, mod_dav, as shipped in Apache httpd
2 or mod_dav 1.0.x for Apache 1.3, contains a NULL pointer dereference
which can be triggered remotely (CAN-2004-0809). The third issue is an
input validation error found in the IPv6 URI parsing routines within
the apr-util library (CAN-2004-0786). Additionally a possible buffer
overflow has been reported when expanding environment variables during
the parsing of configuration files (CAN-2004-0747).

Impact
======

A remote attacker could cause a Denial of Service either by aborting a
SSL connection in a special way, resulting in CPU consumption, by
exploiting the segmentation fault in mod_ssl or the mod_dav flaw. A
remote attacker could also crash a httpd child process by sending a
specially crafted URI. The last vulnerabilty could be used by a local
user to gain the privileges of a httpd child, if the server parses a
carefully prepared .htaccess file.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Apache 2 users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-www/apache-2.0.51"
    # emerge ">=net-www/apache-2.0.51"

All mod_dav users should upgrade to the latest version:

    # emerge sync

    # emerge -pv ">=net-www/mod_dav-1.0.3-r2"
    # emerge ">=net-www/mod_dav-1.0.3-r2"

References
==========

  [ 1 ] CAN-2004-0747
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0747
  [ 2 ] CAN-2004-0748
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0748
  [ 3 ] CAN-2004-0751
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0751
  [ 4 ] CAN-2004-0786
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0786
  [ 5 ] CAN-2004-0809
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0809

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

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

  http://security.gentoo.org/glsa/glsa-200409-21.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 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

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