CVE-2019-6851 Explained : Impact and Mitigation

The Modicon M580, Modicon M340, Modicon Premium, and Modicon Quantum (in all versions of their firmware) have a vulnerability called CWE-538 that exposes file and directory information, potentially leading to unauthorized disclosure of information when using the TFTP protocol.

Understanding CVE-2019-6851

This CVE identifies a vulnerability in Schneider Electric's Modicon series PLCs that could result in information exposure.

What is CVE-2019-6851?

The vulnerability in Modicon M580, Modicon M340, Modicon Premium, and Modicon Quantum allows unauthorized access to file and directory information via the TFTP protocol.

The Impact of CVE-2019-6851

The vulnerability could lead to the unauthorized disclosure of sensitive information stored in the controller, posing a risk to the confidentiality of data and system integrity.

Technical Details of CVE-2019-6851

Schneider Electric's Modicon series PLCs are affected by this vulnerability.

Vulnerability Description

The vulnerability, identified as CWE-538, exposes file and directory information, potentially leading to unauthorized data disclosure.

Affected Systems and Versions

Modicon M580
Modicon M340
Modicon Premium
Modicon Quantum
All firmware versions of the above systems

Exploitation Mechanism

The vulnerability can be exploited when the TFTP protocol is used, allowing unauthorized access to sensitive information stored in the controller.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Disable TFTP services if not essential for operations
Implement network segmentation to restrict access to critical systems
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update firmware and security patches provided by Schneider Electric
Conduct security assessments and penetration testing to identify and address vulnerabilities
Educate personnel on cybersecurity best practices to enhance overall security posture

Patching and Updates

Stay informed about security advisories and updates from Schneider Electric
Apply patches and firmware updates promptly to mitigate the risk of exploitation