PHP remote file inclusion vulnerability in index.php in Joomla! 1.0.11 through 1.0.14, when RG_EMULATION is enabled in configuration.php, allows remote attackers to execute arbitrary PHP code via a URL in the mosConfig_absolute_path parameter.
http://www.securityfocus.com/bid/27795
http://www.securityfocus.com/archive/1/488199/100/200/threaded
http://www.securityfocus.com/archive/1/488126/100/200/threaded
http://www.joomla.org/announcements/release-news/4609-joomla-1015-released.html