NTLMv1 Downgrade
Client sends NTLMv1 response when LmCompatibilityLevel
exists and is 2
or lower, which can be downgraded to "NTLMv1 w/o SSP" when NtlmMinClientSec
is 0x20
or lower:
Check
Check with PowerShell:
Check with Seatbelt (example):
Exploit
Exploit with Responder with a known challenge of 1122334455667788
(see Authentication Coercion to trigger callbacks):
ntlmv1-multi + crack.sh
Calculate the token:
Check the final 2 bytes (4 characters) of the NT hash:
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