CVE-2021-36934 Windows Elevation of Privilege

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.

Recent assessments:

Dviros at July 25, 2021 9:35am UTC reported:

Vulnerability is easy to exploit – by interacting with the local ShadowCopy volume, and copying it to a local folder, attackers can easily elevate their privileges.
Several exploits were already released, allowing to parse the hashes while copying the SAM\SECURITY\SYSTEM hives:
<https://github.com/cube0x0/CVE-2021-36934&gt;
<https://github.com/HuskyHacks/ShadowSteal&gt;

This vulnerability occurs due to the permissive “C:\Windows\System32\Config*.*” privileges, “BUILTIN\Users”, allowing any user to read and execute the files.

ccondon-r7 at July 21, 2021 4:24pm UTC reported:

Vulnerability is easy to exploit – by interacting with the local ShadowCopy volume, and copying it to a local folder, attackers can easily elevate their privileges.
Several exploits were already released, allowing to parse the hashes while copying the SAM\SECURITY\SYSTEM hives:
<https://github.com/cube0x0/CVE-2021-36934&gt;
<https://github.com/HuskyHacks/ShadowSteal&gt;

This vulnerability occurs due to the permissive “C:\Windows\System32\Config*.*” privileges, “BUILTIN\Users”, allowing any user to read and execute the files.

Assessed Attacker Value: 5
Assessed Attacker Value: 5Assessed Attacker Value: 5