cloner.functions.php in the XCloner plugin 3.1.1 for WordPress and 3.5.1 for Joomla! allows remote administrators to execute arbitrary code via shell metacharacters in the (1) file name when creating a backup or vectors related to the (2) $_CONFIG[tarpath], (3) $exclude, (4) $_CONFIG[\'tarcompress\'], (5) $_CONFIG[\'filename\'], (6) $_CONFIG[\'exfile_tar\'], (7) $_CONFIG[sqldump], (8) $_CONFIG[\'mysql_host\'], (9) $_CONFIG[\'mysql_pass\'], (10) $_CONFIG[\'mysql_user\'], (11) $database_name, or (12) $sqlfile variable.