SB2020021155 - Privilege escalation in Windows Installer

Description

This security bulletin contains information about 2 vulnerabilities.

1) Link following (CVE-ID: CVE-2020-0683)

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

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:A/U:Clear

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

The vulnerability exists within the Windows Installer when MSI packages process symbolic links. A local user can bypass access restrictions to add or remove files and escalate privileges on the system.

2) Link following (CVE-ID: CVE-2020-0686)

CWE-ID: CWE-59 - Improper Link Resolution Before File Access ('Link Following')

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 elevate privileges on the system.

The vulnerability exists within the Windows Installer when MSI packages process symbolic links. A local user can bypass access restrictions to add or remove files and escalate privileges on the system.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0683
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0686