CVE-2019-6819 : Exploit Details and Defense Strategies

A vulnerability identified as CWE-754 in Modicon Controllers, Modicon M340, Modicon M580, Modicon Quantum, and Modicon Premium could lead to a denial of service situation when specific Modbus frames are transmitted.

Understanding CVE-2019-6819

This CVE involves an improper check for exceptional conditions in Schneider Electric's Modicon products.

What is CVE-2019-6819?

The vulnerability, categorized as CWE-754, allows attackers to trigger a denial of service by sending specific Modbus frames to affected controllers.

The Impact of CVE-2019-6819

The vulnerability poses a risk of denial of service, potentially disrupting operations relying on the affected Modicon products.

Technical Details of CVE-2019-6819

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability stems from an improper check for exceptional conditions, potentially leading to a denial of service scenario.

Affected Systems and Versions

Modicon Controllers, Modicon M340: firmware versions prior to V3.01
Modicon M580: firmware versions prior to V2.80
Modicon Quantum and Modicon Premium: all firmware versions

Exploitation Mechanism

Attackers can exploit this vulnerability by sending specific Modbus frames to the affected controllers, triggering a denial of service.

Mitigation and Prevention

Protecting systems from CVE-2019-6819 is crucial for maintaining security.

Immediate Steps to Take

Apply vendor-supplied patches promptly to mitigate the vulnerability.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly update firmware and software to address security vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses.

Patching and Updates

Stay informed about security advisories from Schneider Electric and apply patches as soon as they are available.