PHP 5.3.9 'php_register_variable_ex()' Code Execution (intrusive check)
Critical Nessus Plugin ID 58039
SynopsisThe remote web server uses a version of PHP that is affected by a code execution vulnerability.
DescriptionThe remote host is running a version of PHP that is affected by an arbitrary code execution vulnerability.
Specifically, the fix for the hash collision denial of service vulnerability (CVE-2011-4885) introduces a remote code execution vulnerability in the function 'php_register_variable_ex()' in the file 'php_variables.c'. A new configuration variable, 'max_input_vars', was added as a 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.
Note that this script assumes the 'max_input_vars' parameter is set to the default value of 1000, and only runs if 'Report paranoia' is set to 'Paranoid', and 'Enable CGI scanning' is checked.
SolutionUpgrade to PHP version 5.3.10 or later.