[ GLSA 200410-04 ] PHP: Memory disclosure and arbitrary location file upload

[Dan Margolis <krispykringle () gentoo org>]

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Gentoo Linux Security Advisory                           GLSA 200410-04
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: PHP: Memory disclosure and arbitrary location file upload
      Date: October 06, 2004
      Bugs: #64223
        ID: 200410-04

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Synopsis
========

Two bugs in PHP may allow the disclosure of portions of memory and
allow remote attackers to upload files to arbitrary locations.

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           < 4.3.9                           >= 4.3.9
  2  dev-php/mod_php       < 4.3.9                            >= 4.3.9
  3  dev-php/php-cgi       < 4.3.9                            >= 4.3.9
    -------------------------------------------------------------------
     3 affected packages on all of their supported architectures.
    -------------------------------------------------------------------

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

Stefano Di Paola discovered two bugs in PHP. The first is a parse error
in php_variables.c that could allow a remote attacker to view the
contents of the target machine's memory. Additionally, an array
processing error in the SAPI_POST_HANDLER_FUNC() function inside
rfc1867.c could lead to the $_FILES array being overwritten.

Impact
======

A remote attacker could exploit the first vulnerability to view memory
contents. On a server with a script that provides file uploads, an
attacker could exploit the second vulnerability to upload files to an
arbitrary location. On systems where the HTTP server is allowed to
write in a HTTP-accessible location, this could lead to remote
execution of arbitrary commands with the rights of the HTTP server.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All PHP, mod_php and php-cgi users should upgrade to the latest stable
version:

    # emerge sync

    # emerge -pv ">=dev-php/php-4.3.9"
    # emerge ">=dev-php/php-4.3.9"

    # emerge -pv ">=dev-php/mod_php-4.3.9"
    # emerge ">=dev-php/mod_php-4.3.9"

    # emerge -pv ">=dev-php/php-cgi-4.3.9"
    # emerge ">=dev-php/php-cgi-4.3.9"

References
==========

  [ 1 ] Secunia Advisory
        http://secunia.com/advisories/12560/
  [ 2 ] BugTraq post regarding the php_variables.c issue
        http://www.securityfocus.com/archive/1/375294
  [ 3 ] BugTraq post regarding the rfc1867.c issue
        http://www.securityfocus.com/archive/1/375370

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

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

  http://security.gentoo.org/glsa/glsa-200410-04.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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