CVE-2020-7563 : Security Advisory and Response

A CWE-787 vulnerability exists in the Web Server on Modicon M340, Modicon Quantum, and Modicon Premium Legacy offers and their Communication Modules, potentially leading to data corruption, crashes, or code execution.

Understanding CVE-2020-7563

This CVE involves an Out-of-bounds Write vulnerability in specific Schneider Electric devices.

What is CVE-2020-7563?

The CVE-2020-7563 vulnerability is an Out-of-bounds Write issue in the Web Server on Modicon M340, Modicon Quantum, and Modicon Premium Legacy offers and their Communication Modules. This flaw could be exploited by uploading a specially crafted file over FTP, resulting in various malicious activities.

The Impact of CVE-2020-7563

The vulnerability could allow an attacker to corrupt data, cause system crashes, or potentially execute arbitrary code on the affected devices, posing a significant security risk.

Technical Details of CVE-2020-7563

This section provides more in-depth technical insights into the CVE.

Vulnerability Description

The CWE-787 vulnerability in the Web Server on Modicon M340, Modicon Quantum, and Modicon Premium Legacy offers and their Communication Modules allows for out-of-bounds write operations, which can lead to severe consequences when exploited maliciously.

Affected Systems and Versions

The affected systems include the Web Server on Modicon M340, Modicon Quantum, and Modicon Premium Legacy offers and their Communication Modules. The specific versions impacted are detailed in the notification.

Exploitation Mechanism

The vulnerability can be exploited by uploading a specially crafted file on the controller over FTP, triggering the out-of-bounds write operation and potentially enabling unauthorized access or control.

Mitigation and Prevention

To address CVE-2020-7563, immediate actions and long-term security practices are crucial.

Immediate Steps to Take

Apply security patches provided by Schneider Electric promptly.
Implement network segmentation to limit exposure of vulnerable devices.
Monitor network traffic for any suspicious activities.

Long-Term Security Practices

Regularly update and patch all software and firmware on the affected devices.
Conduct security assessments and penetration testing to identify and address vulnerabilities proactively.

Patching and Updates

Ensure that all relevant security patches and updates released by Schneider Electric are applied to the affected systems to mitigate the risk of exploitation.