CVE-2021-36934
Description
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. An attacker must have the ability to execute code on a victim system to exploit this vulnerability. After installing this security update, you must manually delete all shadow copies of system files, including the SAM database, to fully mitigate this vulnerabilty. Simply installing this security update will not fully mitigate this vulnerability. See KB5005357- Delete Volume Shadow Copies.
How to fix
Apply updates per vendor instructions.
CISA due date: Feb 24, 2022- microsoft windows_10_180910.0.17763.2114 or later
- microsoft windows_10_190910.0.18363.1734 or later
- microsoft windows_10_200410.0.19041.1165 or later
- microsoft windows_10_20h210.0.19042.1165 or later
- microsoft windows_10_21h110.0.19043.1165 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft windows_10_1809 | v < 10.0.17763.2114 | 10.0.17763.2114 |
| microsoft windows_10_1909 | v < 10.0.18363.1734 | 10.0.18363.1734 |
| microsoft windows_10_2004 | v < 10.0.19041.1165 | 10.0.19041.1165 |
| microsoft windows_10_20h2 | v < 10.0.19042.1165 | 10.0.19042.1165 |
| microsoft windows_10_21h1 | v < 10.0.19043.1165 | 10.0.19043.1165 |
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Attack Surface Management
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