Microsoft quietly fixes ShadowCoerce Windows NTLM Relay bug

Microsoft has confirmed it fixed a previously disclosed ‘ShadowCoerce’ vulnerability as part of the June 2022 updates that enabled attackers to target Windows servers in NTLM relay attacks.

This NTLM relay attack method can be used by threat actors to force unpatched servers to authenticate against servers under the attacker’s control, leading to a takeover of the Windows domain.

As BleepingComputer was told by a Microsoft spokesperson, while there was no public announcement made regarding this issue, the “MS-FSRVP coercion abuse PoC aka ‘ShadowCoerce’ was mitigated with CVE-2022-30154, which affected the same component.”

BleepingComputer emailed Redmond after ACROS Security CEO Mitja Kolsek discovered that ShadowCoerce was silently patched while researching it with the 0Patch team to issue a micropatch.

While it is good that Microsoft has fixed this vulnerability, they have not yet provided any details publicly and is yet to assign a CVE ID.

This has prompted security firms and researchers [1, 2, 3, 4] to ask Redmond for more transparency and to include more info on what’s fixed in its security bulletins.

Article Beeping Computer

Roy Miehe | MspPortal Partners Inc. | Ceo/President

Security Software Distributor: Bitdefender , Barracuda, RackSpace, Axcient

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