CVE-2021-41028 : Security Advisory and Response

A use of hard-coded cryptographic key vulnerability in FortiClientEMS and an improper certificate validation vulnerability in FortiClientWindows, FortiClientLinux, and FortiClientMac may lead to a man-in-the-middle attack.

Understanding CVE-2021-41028

A combination of cryptographic key and certificate validation vulnerabilities in Fortinet products.

What is CVE-2021-41028?

This CVE encompasses the exploitation of vulnerabilities in FortiClientEMS, FortiClientWindows, FortiClientLinux, and FortiClientMac, potentially allowing unauthorized interception between EMS and FCT.

The Impact of CVE-2021-41028

CVSS Base Score: 8.2 (High)
Attack Vector: Adjacent Network
Confidentiality Impact: Low
Integrity Impact: High
Availability Impact: High

Technical Details of CVE-2021-41028

A detailed look into the technical aspects of the CVE.

Vulnerability Description

This CVE combines a hard-coded cryptographic key vulnerability in FortiClientEMS with an improper certificate validation vulnerability in other Fortinet clients.

Affected Systems and Versions

Products: Fortinet FortiClientEMS, FortiClientWindows, FortiClientLinux, FortiClientMac
Versions: FortiClientEMS 7.0.1 and below, 6.4.6 and below

Exploitation Mechanism

The vulnerability may allow unauthenticated adjacent network attackers to conduct man-in-the-middle attacks via the telemetry protocol.

Mitigation and Prevention

Steps to address and prevent exploitation of CVE-2021-41028.

Immediate Steps to Take

Update affected Fortinet products to patched versions.
Implement network security measures to detect and prevent man-in-the-middle attacks.

Long-Term Security Practices

Regularly monitor for security advisories and updates from Fortinet.
Conduct security assessments to identify and address vulnerabilities proactively.

Patching and Updates

Apply patches released by Fortinet promptly to mitigate the risk of exploitation.