CVE-2021-36934 PoC — Windows Elevation of Privilege Vulnerability

Title:Windows Elevation of Privilege Vulnerability (CVE-2021-36934)
Description:<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>

Windows Elevation of Privilege Vulnerability CVE-2021-36934

<p><strong>Windows Elevation of Privilege Vulnerability CVE-2021-36934&nbsp; &nbsp;#SeriousSAM</strong></p>
<p>Description see MS article:&nbsp;<a href="https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934">https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934</a></p>
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<p><strong><u>To deploy the workaround via GPO</u></strong></p>
<p>Copy paste the below commands in notepad, save as a batch file (.bat extension) and then use to push on to windows machines via GPO.</p>
<p><strong><em>@echo off icacls %windir%\system32\config*.&nbsp;/inheritance:e</em></strong></p>
<p><strong><em>vssadmin delete shadows /all /quiet</em></strong><strong>*</strong></p>
<p>As always, I would advise to test this first prior to mass deployment.</p>

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