[UNIX] php(Reactor) Cross Site Scripting Vulnerability

From: support@securiteam.com
Date: 06/09/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Sun,  9 Jun 2002 19:52:33 +0200 (CEST)

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  php(Reactor) Cross Site Scripting Vulnerability
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SUMMARY

 <http://phpreactor.org/> php(Reactor) is a system of integrated web
applications designed to encourage user interaction and facilitate easy
website maintenance. A Cross-Site Scripting vulnerability exists in
php(Reactor). This would allow a remote attacker to send information to
victims from untrusted web servers, and make it look as if the information
came from the legitimate server.

DETAILS

Vulnerable systems:
php(Reactor) version 1.2.7 and prior

Immune systems:
php(Reactor) version 1.2.7pl1

The "browse.php", in the "comments" section does not filter user input for
$go variable. Therefore, any user may construct a malicious link, gain
information about users, and even get the login information of the
administrator.

Here is the proof-of-concept link example;
http://[target]/comments/browse.php?fid=2&tid=4&go=<script>alert(document.cookie)</script>

Note that, the $fid and $tid variables should be integers.

Solution:
The vendor replied quickly, and has released a new version on 28/05/2002,
which can be downloaded at
<http://sourceforge.net/project/showfiles.php?group_id=12105&release_id=91877> http://sourceforge.net/project/showfiles.php?group_id=12105&release_id=91877

ADDITIONAL INFORMATION

The information has been provided by <mailto:salper@olympos.org> Ahmet
Sabri ALPER.

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