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TITLE:
phpBB Autologin Security Bypass Vulnerability

SECUNIA ADVISORY ID:
SA14493

VERIFY ADVISORY:
http://secunia.com/advisories/14493/

CRITICAL:
Less critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
phpBB 2.x
http://secunia.com/product/463/

DESCRIPTION:
"Some one" has reported a vulnerability in phpBB, which can be
exploited by malicious people to bypass certain security
restrictions.

The vulnerability is caused due to an error in "sessions.php" where
the $userdata['user_level'] variable is not correctly reset after a
failed autologin. This can be exploited to perform certain actions
requiring administrative privileges (e.g. view mail addresses for
arbitrary users).

This is related to:
SA14413

The vulnerability has been reported in version 2.0.13 and prior.

SOLUTION:
Edit the source code to ensure that authentication is properly
performed.

PROVIDED AND/OR DISCOVERED BY:
"Some one"

OTHER REFERENCES:
SA14413:
http://secunia.com/advisories/14413/

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