Privilege escalation in Microsoft Windows

1) Buffer overflow

EUVDB-ID: #VU52164

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-2021-28310

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 within win32k.sys driver in Microsoft Windows. A local user can run a specially crafted program to trigger memory corruption and execute arbitrary code with elevated privileges.

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

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows: 10 20H2 10.0.19042.572 - 10 2004 10.0.19041.264

Windows Server: 2019 10.0.17763.1 - 2019 2004

CPE2.3

• cpe:2.3:o:microsoft:windows:10 20H2:10.0.19042.572:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1803:10.0.17134.48:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1809:10.0.17763.1:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 1909:10.0.18363.476:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows:10 2004:10.0.19041.264:*:*:*:*:*:
• cpe:2.3:o:microsoft:windows_server:2019 2004:*:*:*:*:*:*:

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-28310

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.