Privilege escalation in Microsoft Windows Services and Controller App

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU52149

Risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-27086

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

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 the Windows Services and Controller App, 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 - 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-2021-27086

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.