CVE-2018-7831 Explained : Impact and Mitigation

A vulnerability in the embedded web servers of Schneider Electric's Modicon M340, Premium, Quantum PLCs, and BMXNOR0200 allows attackers to execute a password change on the web server.

Understanding CVE-2018-7831

This CVE involves an improper neutralization of script-related HTML tags in web pages, known as Basic XSS.

What is CVE-2018-7831?

Basic XSS vulnerability in embedded web servers of Schneider Electric PLCs
Allows authenticated attackers to execute a password change via a crafted URL

The Impact of CVE-2018-7831

Attackers can compromise user accounts and potentially disrupt industrial processes
Unauthorized access to critical systems and data

Technical Details of CVE-2018-7831

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

Basic XSS vulnerability in Schneider Electric's Modicon M340, Premium, Quantum PLCs, and BMXNOR0200
Allows attackers to manipulate web server behavior through specially crafted URLs

Affected Systems and Versions

Embedded Web Servers in all Modicon M340, Premium, Quantum PLCs, and BMXNOR0200

Exploitation Mechanism

Attacker sends a specifically designed URL to an authenticated user on the web server
Enables the attacker to execute a password change on the web server

Mitigation and Prevention

Protecting systems from CVE-2018-7831 is crucial for maintaining cybersecurity.

Immediate Steps to Take

Apply security patches provided by Schneider Electric
Monitor web server activity for suspicious behavior
Educate users on identifying and avoiding phishing attempts

Long-Term Security Practices

Regularly update and patch all PLCs and related systems
Implement network segmentation to limit the impact of potential breaches

Patching and Updates

Schneider Electric has released security advisories and patches to address the vulnerability