[UNIX] PForum MySQL Injection Bug

From: support@securiteam.com
Date: 02/18/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Mon, 18 Feb 2002 22:39:18 +0100 (CET)

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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  PForum MySQL Injection Bug
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SUMMARY

 <http://www.powie.de/> PForum is a www-board system using PHP and MySQL.
Although the author seemed to try to eliminate malicious code (e.g.
unwanted html-code) in the inputs, he relies on PHP's Magic-Quotes for
adding slashes to some user input. Therefore, it is possible to use an
SQL-Injection-Attack to log in as administrator or any other user without
knowing the correct password.

DETAILS

Vulnerable systems:
PForum version 1.14 and prior

Immune systems:
PForum version 1.15

If the affected webserver has not enabled PHP's magic_quotes_gpc in the
php.ini, it is possible to login as any user, admin, or moderator.

Proof of concept:
Without having Magic-Quoted enabled, just login with the username "admin'
OR username='admin". If the user admin exists, you will be logged in
without requiring a password. If the user admin is an administrator, you
have all administrator privileges on the board. The same concept works for
the changing password form. In case you have forgotten your password, you
get an id via mail to your registered email address, so you can change
your password to a new one. Here you have to use changepass.php and enter
your id like "123' or 'a'='a" to change your password to any desired.

Temporary fix:
Enable magic_quotes_gpc in your php.ini.

Vendor status:
The vendor reacted very quickly. With some assistance, he needed about 24
hours for a patch. Although he has not made this patch until now, he has
published the bug on his homepage and recommends our temporary fix
(enabling magic_quotes_gpc) until the new version is released.

ADDITIONAL INFORMATION

The information has been provided by <mailto:security@ppp-design.de> Jens
Liebchen.

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