Vulnerability Details : CVE-2021-36934
<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 user rights.</p>
<p>An attacker must have the ability to execute code on a victim system to exploit this vulnerability.</p>
<p>After installing this security update, you <em>must</em> manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. <strong>Simply installing this security update will not fully mitigate this vulnerability.</strong> See <a href="https://support.microsoft.com/topic/1ceaa637-aaa3-4b58-a48b-baf72a2fa9e7">KB5005357- Delete Volume Shadow Copies</a>.</p>
Vulnerability category: Execute codeGain privilege
Products affected by CVE-2021-36934
- cpe:2.3:o:microsoft:windows_10_21h1:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_10_20h2:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_10_2004:*:*:*:*:*:*:*:*
CVE-2021-36934 is in the CISA Known Exploited Vulnerabilities Catalog
CISA vulnerability name:
Microsoft Windows SAM Local Privilege Escalation Vulnerability
CISA required action:
Apply updates per vendor instructions.
CISA description:
If a Volume Shadow Copy (VSS) shadow copy of the system drive is available, users can read the SAM file which would allow any user to escalate privileges to SYSTEM level.
Notes:
https://nvd.nist.gov/vuln/detail/CVE-2021-36934
Added on
2022-02-10
Action due date
2022-02-24
Exploit prediction scoring system (EPSS) score for CVE-2021-36934
0.36%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 73 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-36934
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.6
|
MEDIUM | AV:L/AC:L/Au:N/C:P/I:P/A:P |
3.9
|
6.4
|
NIST | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
NIST | |
|
7.8
|
HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.8
|
5.9
|
Microsoft Corporation |
References for CVE-2021-36934
-
http://packetstormsecurity.com/files/164006/HiveNightmare-AKA-SeriousSAM.html
HiveNightmare AKA SeriousSAM ≈ Packet StormThird Party Advisory;VDB Entry
-
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-36934
CVE-2021-36934 - Security Update Guide - Microsoft - Windows Elevation of Privilege VulnerabilityPatch;Vendor Advisory
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