7.8

CVE-2021-36934

Warning

<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>

Data is provided by the National Vulnerability Database (NVD)
Microsoft ≫ Windows 10 1809 Version < 10.0.17763.2114
Microsoft ≫ Windows 10 1909 Version < 10.0.18363.1734
Microsoft ≫ Windows 10 2004 Version < 10.0.19041.1165
Microsoft ≫ Windows 10 20h2 Version < 10.0.19042.1165
Microsoft ≫ Windows 10 21h1 Version < 10.0.19043.1165

10.02.2022: CISA Known Exploited Vulnerabilities (KEV) Catalog

Microsoft Windows SAM Local Privilege Escalation Vulnerability

Vulnerability

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.

Description

Apply updates per vendor instructions.

Required actions
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 90.27% 0.996
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 4.6 3.9 6.4
AV:L/AC:L/Au:N/C:P/I:P/A:P
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
secure@microsoft.com 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H