PHP < 5.3.10 php_register_variable_ex() RCE

PHP versions prior to 5.3.10 are reportedly affected by a code execution vulnerability. Specifically, the fix for the hash collision denial of service vulnerability (CVE-2011-4885) itself has introduced a remote code execution vulnerability in the php_register_variable_ex() in the file ‘php_variables.c’. A new configuration variable, ‘max_input_vars’, was added as part of the fix. If the number of input variables exceeds this value and the variable being processed is an array, code execution can occur.