main/streams/plain_wrapper.c in PHP 5.3.x before 5.3.1 does not recognize the safe_mode_include_dir directive, which allows context-dependent attackers to have an unknown impact by triggering the failure of PHP scripts that perform include or require operations, as demonstrated by a script that attempts to perform a require_once on a file in a standard library directory. NOTE: a reliable third party reports that this is not a vulnerability, because it results in a more restrictive security policy.
http://www.php.net/releases/5_3_1.php
http://www.php.net/ChangeLog-5.php
http://www.openwall.com/lists/oss-security/2009/11/20/5
http://www.openwall.com/lists/oss-security/2009/11/20/3
http://www.openwall.com/lists/oss-security/2009/11/20/2
http://www.mandriva.com/security/advisories?name=MDVSA-2009:302
http://support.apple.com/kb/HT4077
http://news.php.net/php.announce/79
http://lists.apple.com/archives/security-announce/2010//Mar/msg00001.html