Re: Security problems with TWIG webmail system

[Shaun Clowes <shaun () SECUREREALITY COM AU>]

> Twig is a popular webmail system written in PHP,  once called Muppet.
> Author: Christopher Heschong
> Homepage: http://twig.screwdriver.net
> Version: 2.5.1 ( latest )
> Problem: The possibility of processing our own php file , can leed to
> arbitrary command execution on the server as the httpd user.

I'll refrain from the usual comments about disclosure of vulnerability
information without fix details. As a short term fix try the following:

Simply add:
    unset($config);
    unset($vhosts);
at the top of config/config.inc.php3

Also add:
    unset($dbconfig);
at the top of config/dbconfig.inc.php3 for good measure.

Please note that this vulnerability is only exploitable if the URL fopen
wrappers functionality is compiled in (it is by default) and the script
isn't being run on the windows platform (Windows does not support Remote
Files functionality in include() statements).

Cheers,
Shaun Clowes
SecureReality Pty Ltd.
http://www.securereality.com.au