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update nopac module to catch error connecting to Kerberos and fix formatting

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Marshall Hallenbeck 2023-03-23 23:21:43 -04:00
parent da4f537193
commit 15703d7605
1 changed files with 36 additions and 18 deletions
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42
cme/modules/nopac.py
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@ -8,31 +8,49 @@ from binascii import unhexlify
from impacket.krb5.kerberosv5 import getKerberosTGT
from impacket.krb5 import constants
from impacket.krb5.types import Principal
import logging
class CMEModule:
name = 'nopac'
name = "nopac"
description = "Check if the DC is vulnerable to CVE-2021-42278 and CVE-2021-42287 to impersonate DA from standard domain user"
supported_protocols = ['smb']
supported_protocols = ["smb"]
opsec_safe = True
multiple_hosts = True
def options(self, context, module_options):
'''
'''
"""
"""
def on_login(self, context, connection):
userName = Principal(connection.username, type=constants.PrincipalNameType.NT_PRINCIPAL.value)
tgt_with_pac, cipher, oldSessionKey, sessionKey = getKerberosTGT(userName, connection.password, connection.domain,
unhexlify(connection.lmhash), unhexlify(connection.nthash), connection.aesKey,
connection.host, requestPAC=True)
user_name = Principal(connection.username, type=constants.PrincipalNameType.NT_PRINCIPAL.value)
try:
tgt_with_pac, cipher, old_session_key, session_key = getKerberosTGT(
user_name,
connection.password,
connection.domain,
unhexlify(connection.lmhash),
unhexlify(connection.nthash),
connection.aesKey,
connection.host,
requestPAC=True
)
context.log.highlight("TGT with PAC size " + str(len(tgt_with_pac)))
tgt_no_pac, cipher, oldSessionKey, sessionKey = getKerberosTGT(userName, connection.password, connection.domain,
unhexlify(connection.lmhash), unhexlify(connection.nthash), connection.aesKey,
connection.host, requestPAC=False)
tgt_no_pac, cipher, old_session_key, session_key = getKerberosTGT(
user_name,
connection.password,
connection.domain,
unhexlify(connection.lmhash),
unhexlify(connection.nthash),
connection.aesKey,
connection.host,
requestPAC=False
)
context.log.highlight("TGT without PAC size " + str(len(tgt_no_pac)))
if len(tgt_no_pac) < len(tgt_with_pac):
context.log.highlight("")
context.log.highlight("VULNERABLE")
context.log.highlight("Next step: https://github.com/Ridter/noPac")
except OSError as e:
logging.debug(f"Error connecting to Kerberos (port 88) on {connection.host}")