SB2020101348 - Multiple vulnerabilities in Microsoft Windows Application Compatibility Client Library

Description

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-16876)

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

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

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

The vulnerability exists due to the way Windows Application Compatibility Client Library handles registry operations. A local user can create a malicious application, launch it on the system and gain elevated privileges.

To exploit the vulnerability, an attacker would first need code execution on a victim system.

2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-16920)

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

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to the way Windows Application Compatibility Client Library handles registry operations. A local user can create a malicious application, launch it on the system and gain elevated privileges.

To exploit the vulnerability, an attacker would first need code execution on a victim system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16876
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-16920