Mezzanine CMS 4.1.0 Arbitrary File Upload

[hyp3rlinx@xxxxxxxxx]

[+] Credits: hyp3rlinx

[+] Website: hyp3rlinx.altervista.org

[+] Source:  
http://hyp3rlinx.altervista.org/advisories/MEZZANINE-CMS-ARBITRARY-FILE-UPLOAD.txt



Vendor:
===================
mezzanine.jupo.org


Product:
================
Mezzanine 4.1.0

Mezzanine is an open source CMS built using the python based Django framework.



Vulnerability Type:
=====================
Arbitrary File Upload



CVE Reference:
==============
N/A



Vulnerability Details:
=====================

Issue is within the`FILEBROWSER_EXTENSIONS` setting. This setting was 
previously only used client-side
and was not validated server-side, allowing local malicious users ability to 
bypass file check for uploads
resulting in arbitrary file types like .htaccess, .EXE and .sh being uploaded 
to the system.



Exploit code(s):
===============

Tested following arbitrary file uploads successfully .htaccess, .sh, .EXE ...

[26/Jan/2016 11:39:24] "GET 
/asset_proxy/?u=/static/filebrowser/uploadify/uploadify.swf HTTP/1.1" 200 22894
[26/Jan/2016 11:39:28] "POST /admin/media-library/check_file/ HTTP/1.1" 200 2

Resolution:
Upgrade right away (pip install -U filebrowser_safe).

If for some reason you're unable to upgrade seamlessly, here is the fix which 
you need to apply:
https://github.com/stephenmcd/filebrowser-safe/commit/14b30017d27ca6a952e1578ed8cecbb102979967



Disclosure Timeline:
=====================================
Vendor Notification: January 26, 2016
Feburary 2, 2016  : Public Disclosure



Exploitation Technique:
=======================
Local



Severity Level:
================
Medium



Description:
===================================================
Request Method(s):        [+]  POST


Vulnerable Product:       [+]  Mezzanine 4.1.0

====================================================

[+] Disclaimer
Permission is hereby granted for the redistribution of this advisory, provided 
that it is not altered except by reformatting it, and that due credit is given. 
Permission is explicitly given for insertion in vulnerability databases and 
similar, provided that due credit is given to the author.
The author is not responsible for any misuse of the information contained 
herein and prohibits any malicious use of all security related information or 
exploits by the author or elsewhere.

by hyp3rlinx