[ GLSA 200412-14 ] PHP: Multiple vulnerabilities

[Thierry Carrez <koon () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200412-14
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                                            http://security.gentoo.org/
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  Severity: High
     Title: PHP: Multiple vulnerabilities
      Date: December 19, 2004
      Bugs: #74547
        ID: 200412-14

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Synopsis
========

Several vulnerabilities were found and fixed in PHP, ranging from an
information leak and a safe_mode restriction bypass to a potential
remote execution of arbitrary code.

Background
==========

PHP is a general-purpose scripting language widely used to develop
web-based applications. It can run inside a web server using the
mod_php module or the CGI version of PHP, or can run stand-alone in a
CLI.

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

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  dev-php/php          < 4.3.10                           >= 4.3.10
  2  dev-php/mod_php      < 4.3.10                           >= 4.3.10
  3  dev-php/php-cgi      < 4.3.10                           >= 4.3.10
    -------------------------------------------------------------------
     3 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

Stefan Esser and Marcus Boerger reported several different issues in
the unserialize() function, including serious exploitable bugs in the
way it handles negative references (CAN-2004-1019).

Stefan Esser also discovered that the pack() and unpack() functions are
subject to integer overflows that can lead to a heap buffer overflow
and a heap information leak. Finally, he found that the way
multithreaded PHP handles safe_mode_exec_dir restrictions can be
bypassed, and that various path truncation issues also allow to bypass
path and safe_mode restrictions.

Ilia Alshanetsky found a stack overflow issue in the exif_read_data()
function (CAN-2004-1065). Finally, Daniel Fabian found that addslashes
and magic_quotes_gpc do not properly escape null characters and that
magic_quotes_gpc contains a bug that could lead to one level directory
traversal.

Impact
======

These issues could be exploited by a remote attacker to retrieve web
server heap information, bypass safe_mode or path restrictions and
potentially execute arbitrary code with the rights of the web server
running a PHP application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All PHP users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-php/php-4.3.10"

All mod_php users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-php/mod_php-4.3.10"

All php-cgi users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-php/php-cgi-4.3.10"

References
==========

  [ 1 ] PHP 4.3.10 Release Announcement
        http://www.php.net/release_4_3_10.php
  [ 2 ] Hardened-PHP Security Advisory
        http://www.hardened-php.net/advisories/012004.txt
  [ 3 ] SEC Consult Advisory

http://www.securityfocus.com/archive/1/384663/2004-12-15/2004-12-21/0
  [ 4 ] CAN-2004-1019
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1019
  [ 5 ] CAN-2004-1065
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-1065

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

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

  http://security.gentoo.org/glsa/glsa-200412-14.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/2.0

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