CVE-2019-5637 : Vulnerability Insights and Analysis

Beckhoff TwinCAT Profinet Driver Divide-by-Zero Denial of Service

Understanding CVE-2019-5637

This CVE involves a denial of service vulnerability in Beckhoff TwinCAT due to a divide-by-zero issue in the Profinet driver.

What is CVE-2019-5637?

The vulnerability in Beckhoff TwinCAT allows attackers to disrupt the controller by sending a malformed UDP packet, affecting TwinCAT 2 and 3.1 versions.

The Impact of CVE-2019-5637

CVSS Base Score: 7.5 (High)
Attack Vector: Network
Availability Impact: High
No impact on Confidentiality or Integrity

Technical Details of CVE-2019-5637

This section provides specific technical details about the vulnerability.

Vulnerability Description

The flaw in the Profinet driver of Beckhoff TwinCAT enables a denial of service attack through the transmission of a faulty UDP packet.

Affected Systems and Versions

TwinCAT 2: Version 2304 and earlier
TwinCAT 3.1: Version 4204.0 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by sending a malformed UDP packet to the device, causing a divide-by-zero issue and leading to a denial of service.

Mitigation and Prevention

Protecting systems from CVE-2019-5637 requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor patches promptly
Implement network segmentation to limit exposure
Monitor network traffic for suspicious activities

Long-Term Security Practices

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

Patching and Updates

Beckhoff has released patches to address the vulnerability
Refer to the vendor's security advisories for patching instructions