SB2020021161 - Privilege escalation in Microsoft Windows

Description

This security bulletin contains information about 2 vulnerabilities.

1) Buffer overflow (CVE-ID: CVE-2020-0737)

CWE-ID: CWE-119 - Memory corruption

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 privilege so the system.

The vulnerability exists due to a boundary error in the tapisrv.dll when handling objects in memory. A local user can create a specially crafted application, trigger memory corruption and execute arbitrary code on the target system with elevated privileges.

2) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-0739)

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 in the way that the dssvc.dll handles file creation allowing for a file overwrite or creation in a secured location. A local user can run a specially crafted application to execute code with elevated permissions.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0737
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0739