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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@xxxxxxxxxx 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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