CVE-2020-7564 : Exploit Details and Defense Strategies

A CWE-120 vulnerability exists in the Web Server on Modicon M340, Modicon Quantum, and Modicon Premium Legacy offers and their Communication Modules, potentially allowing unauthorized write access and command execution.

Understanding CVE-2020-7564

This CVE involves a Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in specific Schneider Electric devices.

What is CVE-2020-7564?

The CVE-2020-7564 vulnerability pertains to the Web Server on Modicon M340, Modicon Quantum, and Modicon Premium Legacy offers and their Communication Modules. It enables attackers to execute commands by uploading a malicious file via FTP.

The Impact of CVE-2020-7564

The vulnerability could lead to unauthorized write access and the execution of commands on the affected devices, potentially compromising their security and integrity.

Technical Details of CVE-2020-7564

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability is classified as CWE-120, a Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') issue, allowing attackers to exploit the affected devices.

Affected Systems and Versions

Product: Web Server on Modicon M340, Modicon Quantum, and Modicon Premium Legacy offers and their Communication Modules
Version: Web Server on Modicon M340, Modicon Quantum, and Modicon Premium Legacy offers and their Communication Modules

Exploitation Mechanism

Attackers can exploit this vulnerability by uploading a specially crafted file on the controller over FTP, enabling them to gain unauthorized access and execute commands.

Mitigation and Prevention

To address CVE-2020-7564, follow these mitigation strategies:

Immediate Steps to Take

Apply security patches provided by Schneider Electric.
Restrict FTP access to the affected devices.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update firmware and software on the devices.
Implement network segmentation to isolate critical systems.
Conduct regular security audits and penetration testing.

Patching and Updates

Ensure that all devices are updated with the latest security patches and firmware releases to mitigate the vulnerability effectively.