From: Secunia Security Advisories (sec-advsecunia.com)
Date: Mon Oct 31 2005 - 09:38:59 CST

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TITLE:
phpBB "register_globals" Deregistration Bypass Vulnerabilities

SECUNIA ADVISORY ID:
SA17366

VERIFY ADVISORY:
http://secunia.com/advisories/17366/

CRITICAL:
Highly critical

IMPACT:
Security Bypass, Cross Site Scripting, Manipulation of data, System
access

WHERE:
From remote

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

DESCRIPTION:
Stefan Esser has reported some vulnerabilities in phpBB, which can be
exploited by malicious people to conduct cross-site scripting and SQL
injection attacks, bypass certain security restrictions, and
compromise a vulnerable system.

The vulnerabilities are caused due to some errors where global
variables defined by the user is not properly unset. This can be
exploited in combination with certain input validation errors to
execute arbitrary HTML and script code in a user's browser session in
context of an affected site, manipulate SQL queries by injecting
arbitrary SQL code, and inject and execute arbitrary PHP code.

Successful exploitation requires that "register_globals" is enabled
and that the server runs PHP 5.

The vulnerabilities have been reported in version 2.0.17 and prior.

SOLUTION:
Update to version 2.0.18.
http://www.phpbb.com/downloads.php

PROVIDED AND/OR DISCOVERED BY:
Stefan Esser, Hardened-PHP Project

ORIGINAL ADVISORY:
http://www.hardened-php.net/advisory_172005.75.html

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