CVE-2018-7843 : Security Advisory and Response

The Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium are affected by a CWE-248 vulnerability that can lead to denial of service when manipulating memory blocks.

Understanding CVE-2018-7843

This CVE involves multiple vulnerabilities affecting various Schneider Electric Modicon devices.

What is CVE-2018-7843?

A CWE-248 vulnerability in Modicon M580, M340, Quantum, and Premium devices can cause denial of service by reading memory blocks incorrectly via the Modbus controller.

The Impact of CVE-2018-7843

Denial of service situation due to incorrect data size or offset
All versions of the affected devices are susceptible

Technical Details of CVE-2018-7843

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability allows attackers to trigger a denial of service by manipulating memory blocks improperly.

Affected Systems and Versions

Products: Modicon M580, M340, Quantum, Premium
Versions: All versions of the mentioned products

Exploitation Mechanism

Attackers can exploit the vulnerability by attempting to read memory blocks with incorrect data size or offset via the Modbus controller.

Mitigation and Prevention

Protecting systems from CVE-2018-7843 is crucial for maintaining security.

Immediate Steps to Take

Apply security patches provided by Schneider Electric
Implement network segmentation to limit exposure
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update firmware and software
Conduct security assessments and penetration testing
Educate users on secure practices

Patching and Updates

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