PHP has some vulnerable functions which can be used to break into your server if your scripts are not coded securely. You can setup a list of functions in php.ini using disable_functions directive. This directive allows you to disable certain functions for security reasons. It takes on a comma-delimited list of function names. This disable_functions feature is not affected by Safe Mode. This directive must be set in php.ini For example, you cannot set this in httpd.conf
Open php.ini file:
#vi /etc/php.ini
Find disable_functions and set new list as follows:
disable_functions =exec,passthru,shell_exec,system,proc_open,popen,curl_exec,
curl_multi_exec,parse_ini_file,show_source
Save and close the file. Restart httpd:
# service httpd restart
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