#VU70998 Permissions, Privileges, and Access Controls in Windows and Windows Server - CVE-2023-21746

Vulnerability identifier: #VU70998

Vulnerability risk: Low

CVSSv4.0: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Clear]

CVE-ID: CVE-2023-21746

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to application does not properly impose security restrictions in Windows NTLM, which leads to security restrictions bypass and privilege escalation.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Windows: 10 20H2 10.0.19042.572, 8.1, 8.1 RT, 10, 10 Gold, 10 S, 10 Mobile, 10 21H1 10.0.19043.985, 10 21H2 10.0.19044.1288, 10 22H2 10.0.19045.2130, 10 1507 10.0.10240.16405, 10 1511 10.0.10586.3, 10 1607 10.0.14393.10, 10 1703 10.0.15063.138, 10 1706, 10 1709 10.0.16299.19, 10 1803 10.0.17134.48, 10 1809 10.0.17763.1, 10 1903 10.0.18362.116, 10 1909 10.0.18363.476, 10 2004 10.0.19041.264, 11, 11 21H2 10.0.22000.194, 11 22H2 10.0.22621.521

Windows Server: 2008 R2, 2012, 2012 R2, 2016 10.0.14393.10, 2019 10.0.17763.1, 2019 20H2, 2019 1709, 2019 1803, 2019 1903, 2019 1909, 2019 2004, 2022 10.0.20348.202

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External links
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-21746

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

Yes. This vulnerability is being exploited in the wild.