CVE-2021-36934 on CISA KEV

<p>An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. An attacker who successfully exploited this vulnerability could run arbitrary code wi

01What CISA says about this vulnerability

<p>An elevation of privilege vulnerability exists because of overly permissive Access Control Lists (ACLs) on multiple system files, including the Security Accounts Manager (SAM) database. An attacker who successfully exploited this vulnerability could run arbitrary code with SYSTEM privileges. An attacker could then install programs; view, change, or delete data; or create new accounts with full…

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• portal.msrc.microsoft.com — https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-3693…
• packetstormsecurity.com — http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Microsoft	Windows 10 Version 1809	10.0.0
Microsoft	Windows 10 Version 1909	10.0.0
Microsoft	Windows 10 Version 21H1	10.0.0
Microsoft	Windows 10 Version 2004	10.0.0
Microsoft	Windows 10 Version 20H2	10.0.0

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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