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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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