Privilege escalation in Microsoft Windows Kerberos

1) Buffer overflow

EUVDB-ID: #VU72201

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-21817

CWE-ID: CWE-119 - Memory corruption

Exploit availability: No

Description

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

The vulnerability exists due to a boundary error in Windows Kerberos implementation. A local user can trigger memory corruption and execute arbitrary code with SYSTEM privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 10 - 11 22H2 10.0.22621.521

Windows Server: 2008 - 2022 20H2

CPE2.3

• cpe:2.3:o:microsoft:windows:10 1809:10.0.17763.1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 20H2:10.0.19042.572:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:11 21H2:10.0.22000.194:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1607:10.0.14393.10:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:11 22H2:10.0.22621.521:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 22H2:10.0.19045.2130:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10:1706:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 21H2:10.0.19044.1288:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 21H1:10.0.19043.985:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10:S:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1507:10.0.10240.16405:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10:Mobile:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 2004:10.0.19041.264:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1909:10.0.18363.476:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1903:10.0.18362.116:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1803:10.0.17134.48:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1709:10.0.16299.19:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1703:10.0.15063.138:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10 1511:10.0.10586.3:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows:10:Gold:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2019:10.0.17763.1:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2022:10.0.20348.202:*:*:*:*:*:*
• cpe:2.3:o:microsoft:windows_server:2016:10.0.14393.10:*:*:*:*:*:*

External links

http://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21817

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?

No. We are not aware of malware exploiting this vulnerability.