From: djmaze at cpgnuke dot com
Operating system: Windows
PHP version: 5.1.1
PHP Bug Type: *Regular Expressions
Bug description: preg_replace exploit using 'e' (executor)
Description:
------------
When using preg_replace() with the 'e' modifier you can exploit variables
since the $ sign doesn't get backslashed.
Tested on several PHP versions both 4.x and 5.x
Reproduce code:
---------------
<?php
error_reporting(E_ALL);
$exploited = 'my password';
$exploit = '[php]$exploited[/php]';
function highlight_php($txt)
{
return "<pre>$txt</pre>";
}
echo preg_replace('#\[PHP\](.*?)\[/PHP\]#sie', 'highlight_php("\\1")',
$exploit); # exploited
echo preg_replace('#\[PHP\](.*?)\[/PHP\]#sie', 'highlight_php(\'\\1\')',
$exploit); # no exploit
?>
Expected result:
----------------
<pre>$exploited</pre>
Actual result:
--------------
<pre>my password</pre>
--
Edit bug report at http://bugs.php.net/?id=35960&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=35960&r=trysnapshot44
Try a CVS snapshot (PHP 5.1):
http://bugs.php.net/fix.php?id=35960&r=trysnapshot51
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=35960&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=35960&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=35960&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=35960&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=35960&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=35960&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=35960&r=support
Expected behavior: http://bugs.php.net/fix.php?id=35960&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=35960&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=35960&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=35960&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=35960&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=35960&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=35960&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=35960&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=35960&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=35960&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=35960&r=mysqlcfg
