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Gentoo Linux Security Advisory                           GLSA 200402-04
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~                                             http://security.gentoo.org
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~  Severity: Normal
~     Title: Gallery <= 1.4.1 remote exploit vulnerability
~      Date: February 11, 2004
~      Bugs: #39638
~        ID: 200402-04

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Synopsis
========

The Gallery developers have discovered a potentially serious security
flaw in Gallery 1.3.1, 1.3.2, 1.3.3, 1.4 and 1.4.1 which can a remote
exploit of your webserver.

Background
==========

Gallery is an open source image management system written in PHP. More
information is available at  http://gallery.sourceforge.net.

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

Starting in the 1.3.1 release, Gallery includes code to simulate the
behaviour of the PHP 'register_globals' variable in environments where
that setting is disabled.  It is simulated by extracting the values of
the various $HTTP_ global variables into the global namespace.

Impact
======

A crafted URL such as 
http://example.com/gallery/init.php?HTTP_POST_VARS=xxx causes the
'register_globals' simulation code to overwrite the $HTTP_POST_VARS
which, when it is extracted, will deliver the given payload. If the
payload compromises $GALLERY_BASEDIR then the malicious user can perform
a PHP injection exploit and gain remote access to the webserver with PHP
user UID access rights.

Workaround
==========

The workaround for the vulnerability is to replace "init.php" and
"setup/init.php" with the files in the following ZIP file: 
http://prdownloads.sourceforge.net/gallery/patch_1.4.1-to-1.4.1-pl1.zip?download

Resolution
==========

All users are encouraged to upgrade their gallery installation:

~    # emerge sync
~    # emerge -p ">=app-misc/gallery-1.4.1_p1"
~    # emerge ">=app-misc/gallery-1.4.1_p1"

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.