CVE-2019-5636 Explained : Impact and Mitigation
Learn about CVE-2019-5636, a denial of service vulnerability in Beckhoff TwinCAT Runtime due to corrupted UDP packets. Find out affected versions, impact, and mitigation steps.
Beckhoff TwinCAT Discovery Service Denial of Service
Understanding CVE-2019-5636
This CVE involves a denial of service vulnerability in Beckhoff TwinCAT Runtime when receiving corrupted UDP packets, affecting specific versions of TwinCAT 2 and TwinCAT 3.1.
What is CVE-2019-5636?
If a corrupted UDP packet is received by the Beckhoff TwinCAT Runtime, the ADS Discovery Service is disabled, impacting specific versions of TwinCAT 2 and TwinCAT 3.1.
The Impact of CVE-2019-5636
- Base Score: 5.3 (Medium Severity)
- Attack Vector: Network
- Attack Complexity: Low
- Availability Impact: Low
- No impact on Confidentiality or Integrity
- No privileges required
- User Interaction: None
Technical Details of CVE-2019-5636
Vulnerability Description
When TwinCAT Runtime receives a malformed UDP packet, the ADS Discovery Service shuts down, affecting specific versions of TwinCAT 2 and TwinCAT 3.1.
Affected Systems and Versions
- TwinCAT 2 version 2304 or earlier
- TwinCAT 3.1 version 4204.0 or earlier
Exploitation Mechanism
The vulnerability is exploited by sending corrupted UDP packets to the Beckhoff TwinCAT Runtime, triggering the ADS Discovery Service shutdown.
Mitigation and Prevention
Immediate Steps to Take
- Apply patches provided by Beckhoff to address the vulnerability
- Monitor network traffic for any suspicious activity
Long-Term Security Practices
- Regularly update and patch all software and firmware
- Implement network segmentation and access controls
Patching and Updates
- Beckhoff has released patches to mitigate the vulnerability