Privilege escalation in Microsoft Defender

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU50489

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-2021-24092

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 Microsoft Defender, which leads to security restrictions bypass and privilege escalation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Microsoft Endpoint Protection: All versions

Microsoft Security Essentials: All versions

Windows Defender: on Windows Server 2008 - for Windows 10, Windows 10 1511, Windows 10 1607, Windows Server 2016, Windows 10 1703

CPE2.3

• cpe:2.3:a:microsoft:microsoft_endpoint_protection:*:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:microsoft_security_essentials:*:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:windows_defender:on Windows Server 2008:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:windows_defender:on Windows Server 2012:*:*:*:*:*:*:
• cpe:2.3:a:microsoft:windows_defender:for Windows Server 2019:*:*:*:*:*:*:

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-24092

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.