SB2021071337 - Multiple vulnerabilities in Microsoft Windows Installer

Description

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2021-34511)

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 application does not properly impose security restrictions in the Windows Installer, which leads to security restrictions bypass and privilege escalation.

2) Spoofing attack (CVE-ID: CVE-2021-33765)

CWE-ID: CWE-451 - User Interface (UI) Misrepresentation of Critical Information (Clickjacking, spoofing)

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

The vulnerability allows a local attacker to perform spoofing attack.

The vulnerability exists due to incorrect processing of user-supplied data in the Windows Installer. A local attacker can spoof page content.

Remediation

Install update from vendor's website.

References

• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34511
• https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-33765