SB2020031110 - Privilege escalation in Windows Installer
Published: March 11, 2020
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 5 secuirty vulnerabilities.
1) Link following (CVE-ID: CVE-2020-0779)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to insecure processing of symbolic links in MSI packages within the Windows Installer. A local user can create a specially crafted symbolic link and elevate privileges on the system.
2) Insecure DLL loading (CVE-ID: CVE-2020-0798)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to Windows Installer fails to properly sanitize input leading to an insecure library loading behavior. A local user can place a malicious library on the affected filesystem and escalate privileges on the system.
3) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-0814)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to the way Windows Installer handles certain filesystem operations. A local user can escalate privileges on the system.
4) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-0842)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to the way Windows Installer handles certain filesystem operations. A local user can escalate privileges on the system.
5) Permissions, Privileges, and Access Controls (CVE-ID: CVE-2020-0843)
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to the way Windows Installer handles certain filesystem operations. A local user can escalate privileges on the system.
Remediation
Install update from vendor's website.
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0779
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0798
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0814
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0842
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-0843