Privilege escalation in Microsoft Windows CloudStore

Published: 2019-10-09 | Updated: 2019-10-09
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-1321
CWE ID CWE-264
Exploitation vector Local
Public exploit N/A
Vulnerable software Windows Subscribe
Windows Server
Vendor Microsoft

Security Advisory

This security advisory describes one low risk vulnerability.

1) Permissions, Privileges, and Access Controls

Severity: Low

CVSSv3: 5.1 [CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:L/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-1321

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

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 1709, 10 1803, 10 1809, 10 1903

Windows Server: 1803, 1903, 2019

CPE External links

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

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.