CVE-2018-7830 : What You Need to Know

The embedded web servers in all Modicon M340, Premium, Quantum PLCs, and BMXNOR0200 by Schneider Electric SE are vulnerable to 'HTTP Response Splitting', allowing attackers to cause a temporary denial of service.

Understanding CVE-2018-7830

This CVE identifies a specific vulnerability affecting Schneider Electric SE's embedded web servers.

What is CVE-2018-7830?

The vulnerability known as 'HTTP Response Splitting' in the embedded web servers of certain Schneider Electric PLCs enables attackers to disrupt services temporarily.

The Impact of CVE-2018-7830

The vulnerability allows attackers to trigger a denial of service for approximately one minute by sending a maliciously crafted HTTP request.

Technical Details of CVE-2018-7830

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from improper neutralization of CRLF sequences in HTTP headers, leading to HTTP Response Splitting.

Affected Systems and Versions

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

Exploitation Mechanism

Attackers exploit this vulnerability by sending carefully crafted HTTP requests to the affected web servers.

Mitigation and Prevention

Protecting systems from CVE-2018-7830 is crucial to maintaining security.

Immediate Steps to Take

Apply security patches provided by Schneider Electric SE
Monitor network traffic for any suspicious HTTP requests
Implement firewall rules to filter out potentially harmful requests

Long-Term Security Practices

Regularly update and patch all PLCs and related systems
Conduct security audits and penetration testing to identify vulnerabilities
Educate staff on recognizing and responding to potential cyber threats

Patching and Updates

Ensure that all affected systems are updated with the latest patches and firmware releases to mitigate the CVE-2018-7830 vulnerability.