CVE-2019-6844 : Exploit Details and Defense Strategies

A vulnerability exists in Modicon M580, Modicon M340, and Modicon BMxCRA / 140CRA modules that could lead to a Denial of Service attack on the PLC when upgrading the controller with a firmware package containing an invalid web server image using FTP protocol.

Understanding CVE-2019-6844

This CVE involves an Improper Handling of Exceptional Conditions vulnerability in Schneider Electric's Modicon devices.

What is CVE-2019-6844?

The vulnerability in Modicon M580, Modicon M340, and Modicon BMxCRA / 140CRA modules allows for a Denial of Service attack during controller firmware upgrades.

The Impact of CVE-2019-6844

The vulnerability can result in a Denial of Service attack on the PLC, affecting the availability and functionality of the industrial control system.

Technical Details of CVE-2019-6844

This section provides technical details about the vulnerability.

Vulnerability Description

CWE-755: Improper Handling of Exceptional Conditions in Modicon M580, Modicon M340, and Modicon BMxCRA / 140CRA modules

Affected Systems and Versions

Products affected: Modicon M580, Modicon M340, and Modicon BMxCRA / 140CRA modules
All firmware versions are vulnerable

Exploitation Mechanism

The vulnerability occurs when upgrading the controller with a firmware package containing an invalid web server image using FTP protocol.

Mitigation and Prevention

Protecting systems from CVE-2019-6844 is crucial for maintaining security.

Immediate Steps to Take

Apply patches and updates provided by Schneider Electric
Implement network segmentation to isolate critical systems
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update firmware and software to the latest versions
Conduct security assessments and penetration testing on industrial control systems

Patching and Updates

Stay informed about security advisories from Schneider Electric
Apply recommended patches promptly to mitigate the vulnerability