CVE-2021-41526 Explained : Impact and Mitigation

A vulnerability has been reported in the Windows Installer (MSI) built with InstallScript custom action that may allow privilege escalation during the 'repair' process.

Understanding CVE-2021-41526

This CVE involves a security flaw in the Windows Installer that can potentially lead to privilege escalation.

What is CVE-2021-41526?

CVE-2021-41526 is a vulnerability in the Windows Installer (MSI) that arises with the execution of 'repair' involving InstallScript custom action. The flaw allows attackers to escalate privileges.

The Impact of CVE-2021-41526

The vulnerability could be exploited by an attacker to elevate privileges on a system where the affected MSI repair process is triggered.

Technical Details of CVE-2021-41526

This section provides specific technical details about the CVE.

Vulnerability Description

The flaw in the Windows Installer (MSI) with InstallScript custom action allows malicious actors to manipulate the 'repair' process and gain elevated privileges.

Affected Systems and Versions

Vendor: Not applicable (n/a)
Product: Not applicable (n/a)
Versions: All versions are affected.

Exploitation Mechanism

The vulnerability can be exploited through the 'repair' function of the affected MSI when it contains an InstallScript custom action.

Mitigation and Prevention

Here are steps to mitigate the CVE-2021-41526 vulnerability.

Immediate Steps to Take

Avoid running MSI files from untrusted sources.
Monitor system logs for any unusual repair activities.
Implement least privilege access to limit the impact of privilege escalation.

Long-Term Security Practices

Regularly update and patch the Windows Installer to the latest version.
Conduct security training to raise awareness of potential threats related to MSI files.

Patching and Updates

Ensure that security patches addressing CVE-2021-41526 are promptly applied when made available.