[UNIX] Cookie Vulnerability in AlGuest Guestbook (Administrative rights)

From: support@securiteam.com
Date: 03/26/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Tue, 26 Mar 2002 12:29:03 +0100 (CET)

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  Cookie Vulnerability in AlGuest Guestbook (Administrative rights)
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SUMMARY

 <http://www.hotscripts.com/Detailed/14105.html> AlGuest is a powerful
guestbook based on a MySQL database. It has a complete administration
tool, two languages (new languages can be added simply) and very nice
graphic. It is light and fast. A security vulnerability in the product
allows attackers to cause the product to think they are administrators by
placing a fake Administrator cookie on their computer.

DETAILS

Vulnerable systems:
AlGuest version 1.0

AlGuest is a guestbook programmed in PHP. A major flaw in the program has
been found to enable any user to access the administrator panel. The flaw
is caused because cookie data is not properly checked for administrator
rights (i.e. username, password), but rather only checked if whether the
cookie is present "elseif(isset($admin))". Therefore, an attacker can just
create the cookie and gain access to administrator panel.

Possible solution:
A solution might be this "elseif(isset($HTTP_COOKIE_VARS['admin'] ==
$password && $username))".

ADDITIONAL INFORMATION

The information has been provided by <mailto:br014c1155@blueyonder.co.uk>
MOD.

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