CVE-2020-7539 : Exploit Details and Defense Strategies

A CWE-754 vulnerability exists in the Web Server on Modicon M340, causing a denial of service when a specially crafted packet is sent over HTTP.

Understanding CVE-2020-7539

This CVE involves an Improper Check for Unusual or Exceptional Conditions vulnerability in the Web Server on Modicon M340.

What is CVE-2020-7539?

The vulnerability in the Web Server on Modicon M340 could lead to a denial of service when a specially crafted packet is sent to the controller over HTTP.

The Impact of CVE-2020-7539

The vulnerability could be exploited to cause a denial of service, disrupting the normal operation of the affected systems.

Technical Details of CVE-2020-7539

This section provides more technical insights into the CVE.

Vulnerability Description

The CWE-754 vulnerability allows for a denial of service attack by exploiting an improper check for unusual or exceptional conditions in the Web Server on Modicon M340.

Affected Systems and Versions

Product: Web Server on Modicon M340, Legacy Offers Modicon Quantum and Modicon Premium
Versions: See security notification for affected versions

Exploitation Mechanism

The vulnerability can be triggered by sending a specially crafted packet to the controller over HTTP.

Mitigation and Prevention

Protecting systems from CVE-2020-7539 is crucial for maintaining security.

Immediate Steps to Take

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

Long-Term Security Practices

Regularly update and patch all software and firmware
Conduct security assessments and penetration testing
Educate users on safe browsing habits and security best practices

Patching and Updates

Ensure that all affected systems are updated with the latest patches to mitigate the vulnerability.