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Microsoft has announced a high severity vulnerability impacting multiple versions of the Windows 10 operating system. The vulnerability is tracked as CVE-2021-36934 and is alternatively referred to as HiveNightmare and SeriousSAM. It is a Local Privilege Escalation (LPE) vulnerability; exploitation may allow a previously authenticated threat actor the ability to escalate their privileges on a vulnerable device and potentially install programs, change or delete data, or create new user accounts. Microsoft has not released security patches for this vulnerability. Organizations are strongly recommended to apply the relevant mitigations until security patches are made available.
HiveNightmare impacts all versions of Windows 10 since version 1809, released October 17th, 2017. Proof-of-Concept (PoC) exploit code for this vulnerability is publicly available, but currently only allows for Denial-of-Service (DoS) attacks. It is highly likely that threat actors will alter the PoC code and employ it in real world attacks in the immediate future. As exploitation requires previous compromise, organizations are recommended to ensure that an endpoint monitoring solution is widely deployed in order to identify threat actor initial access attempts.
Mitigations from Microsoft: