CVE-2021-27451 Explained : Impact and Mitigation

This article provides an overview of CVE-2021-27451, a vulnerability in Mesa Labs AmegaView Versions 3.0 and prior that allows attackers to gain unauthorized access due to an easily reversible passcode generation algorithm.

Understanding CVE-2021-20657

CVE-2021-27451 is an improper authentication vulnerability discovered in Mesa Labs AmegaView, impacting versions 3.0 and below.

What is CVE-2021-27451?

The vulnerability arises from the use of an easily reversible algorithm to generate passcodes in Mesa Labs AmegaView devices, potentially granting unauthorized users access to the affected device.

The Impact of CVE-2021-27451

With a CVSS base score of 7.3, this vulnerability poses a high-severity risk, allowing attackers to bypass authentication mechanisms and gain unauthorized access to the vulnerable device.

Technical Details of CVE-2021-27451

The technical details of CVE-2021-27451 include:

Vulnerability Description

Mesa Labs AmegaView Versions 3.0 and earlier utilize a passcode generation algorithm that is easily reversible, enabling attackers to exploit the vulnerability and access the device.

Affected Systems and Versions

The affected product is AmegaView by Mesa Labs, specifically impacting versions 3.0 and below.

Exploitation Mechanism

Attackers can exploit this vulnerability by leveraging the flawed passcode generation algorithm to gain unauthorized access to the vulnerable device.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-27451, users can take the following measures:

Immediate Steps to Take

Mesa Labs has scheduled AmegaView for end-of-life at the end of 2021. Users are advised to upgrade to the newer ViewPoint software compatible with AmegaView hardware.
Minimize network exposure for control system devices, ensuring they are not accessible from the internet.
Isolate control system networks behind firewalls and separate them from the business network.
When remote access is necessary, use secure methods such as Virtual Private Networks (VPNs) with updated versions.

Long-Term Security Practices

Regularly update software and firmware to address vulnerabilities.
Implement strong access controls and authentication mechanisms.
Conduct security training for users to raise awareness about potential threats.

Patching and Updates

Due to the end-of-life status of AmegaView, Mesa Labs does not plan to release updates. Users are advised to transition to the newer ViewPoint software for enhanced security.