The resource system in PHP 5.0.0 through 5.2.1 allows context-dependent attackers to execute arbitrary code by interrupting the hash_update_file function via a userspace (1) error or (2) stream handler, which can then be used to destroy and modify internal resources. NOTE: it was later reported that PHP 5.2 through 5.2.13 and 5.3 through 5.3.2 are also affected.
php-security.org/2010/05/01/mops-2010-001-php-hash_update_file-already-freed-resource-access-vulnerability/index.html
secunia.com/advisories/24542
www.php-security.org/MOPB/MOPB-28-2007.html
www.securityfocus.com/bid/23062
exchange.xforce.ibmcloud.com/vulnerabilities/33248
www.exploit-db.com/exploits/3529