A PHP security update has been released for Gentoo Linux

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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