Microsoft fixes new PetitPotam Windows NTLM Relay attack vector

By Lawrence Abrams, Bleeping Computer

A recent security update for a Windows NTLM Relay Attack has been confirmed to be a previously unfixed vector for the PetitPotam attack.

During the May 2022 Patch Tuesday, Microsoft released a security update for an actively exploited NTLM Relay Attack labeled as a 'Windows LSA Spoofing Vulnerability' and tracked as CVE-2022-26925.

"An unauthenticated attacker could call a method on the LSARPC interface and coerce the domain controller to authenticate to the attacker using NTLM. This security update detects anonymous connection attempts in LSARPC and disallows it."

An NTLM Relay Attack allows threat actors to force devices, even domain controllers, to authenticate against malicious servers they control. Once a device authenticates, the malicious server can impersonate the device and gain all of its privileges.

These attacks are significant problems as they could allow a threat actor to gain complete control over the domain.

While Microsoft did not share too many details about the bug, they stated that the fix affected the EFS API OpenEncryptedFileRaw(A/W) function, which indicated that this might be another unpatched vector for the PetitPotam attack.

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