Mezzanine 4.1.0 Arbitrary File Upload

`[+] 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  
`