CVE-2006-0805 Information

Description

The CAPTCHA functionality in php-Nuke 6.0 through 7.9 uses fixed challenge/response pairs that only vary once per day based on the User Agent (HTTP_USER_AGENT) which allows remote attackers to bypass CAPTCHA controls by fixing the User Agent performing a valid challenge/response then replaying that pair in the random_num and gfx_check parameters.

Reference

http://secunia.com/advisories/18936 http://securityreason.com/securityalert/455 http://www.securityfocus.com/archive/1/425394/100/0/threaded http://www.securityfocus.com/bid/16722 http://www.waraxe.us/advisory-45.html