PHP 4.x to 4.3.9, and PHP 5.x to 5.0.2, when running in safe mode on a multithreaded Unix webserver, allows local users to bypass safe_mode_exec_dir restrictions and execute commands outside of the intended safe_mode_exec_dir via shell metacharacters in the current directory name. NOTE: this issue was originally REJECTed by its CNA before publication, but that decision is in active dispute. This candidate may change significantly in the future as a result of further discussion.
https://www.ubuntu.com/usn/usn-99-1/
https://exchange.xforce.ibmcloud.com/vulnerabilities/18511
http://www.securityfocus.com/bid/11964
http://www.securityfocus.com/archive/1/384545
http://www.securityfocus.com/advisories/9028
http://www.php.net/release_4_3_10.php
http://www.mandriva.com/security/advisories?name=MDKSA-2005:072
http://www.mandriva.com/security/advisories?name=MDKSA-2004:151