Multiple vulnerabilities were identified in phpBB, which could be exploited by remote attackers to execute arbitrary commands or conduct SQL injection and cross site scripting attacks.
The first issue is due to an input validation error in the "usercp_register.php" script that does not properly validate the "signature_bbcode_uid" variable, which could be exploited by malicious people to conduct SQL injection attacks (when "magic_quotes_gpc" is set to "Off") or execute arbitrary PHP commands by injecting the "e" modifier into a "preg_replace()" statement.
The second vulnerability is due to input validation errors in the "usercp_register.php", "login.php", and "search.php" scripts when processing a specially crafted "error_msg", "forward_page", or "list_cat" variable, which may be exploited by attackers to cause arbitrary scripting code to be executed by the user's browser.
Note : A fully functional exploit has been released.
Credits
Vulnerabilities reported by Stefan Esser
ChangeLog
2005-10-31 : Initial release
2005-12-24 : Exploit published
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