CVE-2021-20597 : Vulnerability Insights and Analysis

A detailed analysis of CVE-2021-20597, an Insufficiently Protected Credentials vulnerability in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules and SIL2 Process CPU modules.

Understanding CVE-2021-20597

This section provides insights into the impact, technical details, and mitigation strategies for CVE-2021-20597.

What is CVE-2021-20597?

The CVE-2021-20597 vulnerability involves Insufficiently Protected Credentials in Mitsubishi Electric MELSEC iQ-R series Safety CPU modules and SIL2 Process CPU modules, allowing unauthorized login by capturing network traffic.

The Impact of CVE-2021-20597

The vulnerability permits remote unauthenticated attackers to access the target system without proper authorization, potentially compromising sensitive information and system integrity.

Technical Details of CVE-2021-20597

This section delves into the specifics of the vulnerability, including the description, affected systems, and exploitation mechanism.

Vulnerability Description

The flaw exists in the firmware versions "26" and earlier of Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU, and all versions of SIL2 Process CPU modules R08/16/32/120PSFCPU, enabling malicious actors to intercept credentials during user registration or password changes.

Affected Systems and Versions

Impacted systems include Mitsubishi Electric MELSEC iQ-R series Safety CPU modules R08/16/32/120SFCPU with firmware versions "26" and earlier, as well as SIL2 Process CPU modules R08/16/32/120PSFCPU in all versions.

Exploitation Mechanism

The vulnerability can be exploited remotely by sniffing network traffic and intercepting credentials, leading to unauthorized access.

Mitigation and Prevention

In this section, best practices to address CVE-2021-20597 are outlined, including immediate steps and long-term security measures.

Immediate Steps to Take

Users are advised to update affected modules to the latest firmware immediately.
Employ network encryption and monitoring to prevent credential interception.

Long-Term Security Practices

Implement strong password policies and regular password changes.
Conduct security awareness training to educate users on phishing and credential theft.

Patching and Updates

Stay informed about security advisories from Mitsubishi Electric and apply patches promptly to mitigate the CVE-2021-20597 risk.