Gentoo: PHP Multiple vulnerabilities
Posted by Benjamin D. Thomas   
Gentoo Several vulnerabilities were found and fixed in PHP image handling functions, potentially resulting in Denial of Service conditions or the remote execution of arbitrary code.
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Gentoo Linux Security Advisory                           GLSA 200504-15
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                                            http://security.gentoo.org/
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  Severity: High
     Title: PHP: Multiple vulnerabilities
      Date: April 18, 2005
      Bugs: #87517
        ID: 200504-15

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Synopsis
========

Several vulnerabilities were found and fixed in PHP image handling
functions, potentially resulting in Denial of Service conditions or
the 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          < 4.3.11                           >= 4.3.11
  2  dev-php/mod_php      < 4.3.11                           >= 4.3.11
  3  dev-php/php-cgi      < 4.3.11                           >= 4.3.11
    -------------------------------------------------------------------
     3 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

An integer overflow and an unbound recursion were discovered in the
processing of Image File Directory tags in PHP's EXIF module
(CAN-2005-1042, CAN-2005-1043). Furthermore, two infinite loops have
been discovered in the getimagesize() function when processing IFF or
JPEG images (CAN-2005-0524, CAN-2005-0525).

Impact
======

A remote attacker could craft an image file with a malicious EXIF IFD
tag, a large IFD nesting level or invalid size parameters and send it
to a web application that would process this user-provided image using
one of the affected functions. This could result in denying service on
the attacked server and potentially executing arbitrary code with the
rights of the web server.

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-4.3.11"

All mod_php users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-php/mod_php-4.3.11"

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

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=dev-php/php-cgi-4.3.11"

References
==========

  [ 1 ] PHP 4.3.11 Release Announcement
        http://www.php.net/release_4_3_11.php
  [ 2 ] CAN-2005-0524
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0524
  [ 3 ] CAN-2005-0525
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0525
  [ 4 ] CAN-2005-1042
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1042
  [ 5 ] CAN-2005-1043
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-1043

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

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

  http://security.gentoo.org/glsa/glsa-200504-15.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 2005 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