Privilege escalation in Windows Malicious Software Removal Tool

1) Input validation error

EUVDB-ID: #VU25249

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-2020-0733

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to incorrect handling of junctions in Windows Malicious Software Removal Tool (MSRT). A local user can run a specially crafted application to elevate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Windows Malicious Software Removal Tool (MSRT): before 5.80

External links

http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0733

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.