Bypass NTLM Message Integrity Check – Drop the MIC
Summary
This article details a method to bypass NTLM Message Integrity Check, building upon previous research into exploiting LLMNR and SMB Message Signing. The technique focuses on compromising SMB signing requirements for potential exploitation.
IFF Assessment
This technique allows attackers to bypass a crucial security mechanism (NTLM Message Integrity Check), potentially leading to further compromise and data theft.
Severity
This is an estimated CVSS score based on the potential for network-based attacks with moderate complexity that could lead to significant impact through unauthorized access and data manipulation.
Defender Context
This research highlights a vulnerability related to SMB signing, a critical security control. Defenders should ensure SMB signing is enforced across their networks to mitigate risks associated with such bypass techniques. Regularly reviewing and hardening network protocols is essential.