Privilege escalation in Microsoft Windows Win32k driver

1) Use-after-free

EUVDB-ID: #VU75900

Risk: High

CVSSv3.1: 8.4 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:H/RL:O/RC:C]

CVE-ID: CVE-2023-29336

CWE-ID: CWE-416 - Use After Free

Exploit availability: Yes

Description

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

The vulnerability exists due to a boundary error within the Win32k driver. A local user can trigger a use-after-free error and execute arbitrary code with SYSTEM privileges.

Note, the vulnerability is being actively exploited in the wild.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 10 Gold - 10

Windows Server: 2008 R2 - 2016 10.0.14393.10

CPE2.3

• cpe:2.3:o:microsoft:windows:10:Gold:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10:S:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10:Mobile:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 20H2:10.0.19042.572:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 21H1:10.0.19043.985:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 21H2:10.0.19044.1288:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 22H2:10.0.19045.2130:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1507:10.0.10240.16405:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1511:10.0.10586.3:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1607:10.0.14393.10:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows_server:*:*:*:*:*:*:*:

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2023-29336
http://www.numencyber.com/cve-2023-29336-win32k-analysis/

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.