CVE-2021-43066 Explained : Impact and Mitigation

A detailed overview of a vulnerability in Fortinet FortiClientWindows versions that allows for privilege escalation via an external control of file name or path.

Understanding CVE-2021-43066

This CVE involves a security issue in various versions of Fortinet FortiClientWindows leading to privilege escalation.

What is CVE-2021-43066?

The vulnerability allows an attacker to escalate privilege through the MSI installer in Fortinet FortiClientWindows versions.

The Impact of CVE-2021-43066

CVSS Score: 8.4 (High)
Attack Vector: Local
Impact: High availability and integrity impact
Exploit Code Maturity: High
Scope: Changed

Technical Details of CVE-2021-43066

Expanding on the technical aspects of the vulnerability.

Vulnerability Description

Attackers can exploit an external control of file name or path to escalate privilege via the MSI installer.

Affected Systems and Versions

Fortinet FortiClientWindows versions 7.0.2 and below, 6.4.6 and below, 6.2.9 and below, 6.0.10 and below.

Exploitation Mechanism

Low attack complexity with low privileges required locally for exploitation.

Mitigation and Prevention

Guidelines to mitigate and prevent the exploitation of CVE-2021-43066.

Immediate Steps to Take

Disable FortiClientWindows until a patch is available.
Regularly monitor Fortinet security advisories.
Implement the principle of least privilege.

Long-Term Security Practices

Keep FortiClientWindows up to date with the latest security patches.
Conduct regular security assessments and penetration testing.

Patching and Updates

Apply security patches provided by Fortinet promptly.