SB2025061080 - Multiple vulnerabilities in Microsoft Windows Installer

Description

This security bulletin contains information about 2 vulnerabilities.

1) Link following (CVE-ID: CVE-2025-33075)

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 escalate privileges on the system.

The vulnerability exists due to an insecure link following issue in Windows Installer. A local user can create a specially crafted symbolic link to a critical file on the system and overwrite it with privileges of the application.

2) Improper access control (CVE-ID: CVE-2025-32714)

CWE-ID: CWE-284 - Improper Access Control

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 gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in Windows Installer. A local user can bypass implemented security restrictions and gain elevated privileges on the system.

Remediation

Install update from vendor's website.

References

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33075
• https://www.zerodayinitiative.com/advisories/ZDI-25-332/
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-32714
• https://www.zerodayinitiative.com/advisories/ZDI-25-333/