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WordPress Contact Form 7 3.5.2 Shell Upload

WordPress Contact Form 7 3.5.2 Shell Upload
Posted Nov 24, 2013
Authored by MustLive

WordPress Contact Form 7 versions 3.5.2 and below suffer from a remote shell upload vulnerability.

tags | advisory, remote, shell
SHA-256 | b67761ce5c2175bb4250fb9167f3ba1deb8c6aba800b8043a638dfabb5cdd524

WordPress Contact Form 7 3.5.2 Shell Upload

Change Mirror Download
Hello list!

I want to inform you about vulnerability in Contact Form 7 plugin for
WordPress.

This is Code Execution via Arbitrary File Uploading vulnerability.

-------------------------
Affected products:
-------------------------

Vulnerable are Contact Form 7 3.5.2 and previous versions. After my
informing developer released version 3.5.3 with a fix.

-------------------------
Affected vendors:
-------------------------

Contact Form 7
http://contactform7.com

----------
Details:
----------

Code Execution (WASC-31):

Attack is going via uploader. For code execution it's needed to upload phtml
(on web servers with PHP) or asp/aspx (on IIS) files.

The attack can be made as by user with admin rights (to make appropriate
contact form with uploader tag) and by unauthenticated user, if there is
already appropriate contact form at web site (made by unsuspicious admin).

For the first scenario the attack process will be the next.

Attacker with admin access add uploader tag into contact form at the site
and use it for CE via AFU attack.

There must be uploader tag in contact form and it's needed to set allowed
extension to it (because besides the list of forbidden extensions, the
plugin also has the list of allowed extensions and there are no scripts
among them).

[file file-423 filetypes:phtml]

The files are uploaded into folder:
http://site/wp-content/uploads/wpcf7_uploads/

At creation of this folder the file .htaccess is created (with content: Deny
from all).

It can be bypassed at using of other web servers besides Apache (where
.htaccess is ignored), or at Apache it's possible to use vulnerabilities in
WP for file deletion, or via LFI vulnerability to include a file from this
folder.

------------
Timeline:
------------

2013.09.28 - announced at my site.
2013.10.01 - informed developer.
2013.10.03-21 - conversation with developer about this and other
vulnerabilities in CF7.
2013.10.09 - plugin version 3.5.3 was released.
2013.11.21 - disclosed at my site (http://websecurity.com.ua/6799/).

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua

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