http://www.php-security.org/MOPB/PMOPB-46-2007.html "The session_start function in ext/session in PHP 4.x up to 4.4.7 and 5.x up to 5.2.3 allows remote attackers to insert arbitrary attributes into the session cookie via special characters in a cookie that is obtained from (1) PATH_INFO, (2) the session_id function, and (3) the session_start function, which are not encoded or filtered when the new session cookie is generated." Better expressed as: "The session_start function allows a cross-site cookie insertion attack if a user follows an untrusted carefully-crafted URL" "Affected are PHP4 <= 4.4.7 and PHP5 <= 5.2.3"
This issue was addressed in: Red Hat Application Stack: http://rhn.redhat.com/errata/RHSA-2007-0917.html http://rhn.redhat.com/errata/RHSA-2007-0891.html Red Hat Enterprise Linux: http://rhn.redhat.com/errata/RHSA-2007-0890.html http://rhn.redhat.com/errata/RHSA-2007-0889.html http://rhn.redhat.com/errata/RHSA-2007-0888.html Fedora: updated to fixed upstream version