Main Vulnerability Database Vulnerabilities #VU47553

Buffer overflow in Microsoft Windows and Windows Server - CVE-2020-16939

Published: October 13, 2020 / Updated: October 28, 2020

Vulnerability identifier: #VU47553

CSH Severity: Low

CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-16939

CWE-ID: CWE-119

Exploitation vector: Local access

Exploit availability: Public exploit is available

Vulnerability details

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

The vulnerability exists due to a boundary error when Group Policy improperly checks access. A local user can use a specially crafted application to trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Affected software

Microsoft Windows
Windows Server
Solutions Enabler Virtual Appliance
Solutions Enabler
Unisphere for PowerMax Virtual Appliance
Unisphere for PowerMax

How to mitigate CVE-2020-16939

Install update from vendor's website.

Solutions Enabler Virtual Appliance - addressed in versions 9.1.0.17, 9.2.2.0
Solutions Enabler - addressed in versions 9.1.0.17, 9.2.2.0
Unisphere for PowerMax Virtual Appliance - addressed in versions 9.1.0.28, 9.2.2.2
Unisphere for PowerMax - addressed in versions 9.1.0.28, 9.2.2.2

Links to Public Exploits and PoC-codes

Exploit #4755 - CVE-2020-16939 (PoC code for CVE-2020-16939 Windows Group Policy DACL Overwrite Privilege Escalation) (October 28, 2020)

External References

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16939