Vulnerability identifier: #VU21669

Vulnerability risk: Low

CVSSv3.1: 5.1 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-1321

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Windows
Operating systems & Components / Operating system
Windows Server
Operating systems & Components / Operating system

Vendor: Microsoft

Description

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

The vulnerability exists due to the way Windows CloudStore handles file Discretionary Access Control List (DACL). A local user can create a malicious application, launch it on the system, overwrite a targeted file leading to an elevated status and take control of an affected system.

To exploit this vulnerability, an attacker would first have to log on to the system.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Windows: 10 1703 - 10 1903

Windows Server: 2019 - 2019 1903

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External links
http://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1321

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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.