CVE-2020-12526 Explained : Impact and Mitigation
Learn about CVE-2020-12526 affecting TwinCAT OPC UA Server and IPC Diagnostics UA Server by Beckhoff. Find out the impact, affected versions, and mitigation steps to secure your systems.
TwinCAT OPC UA Server and IPC Diagnostics UA Server by Beckhoff are vulnerable to denial of service attacks. Learn about the impact, technical details, and mitigation steps.
Understanding CVE-2020-12526
What is CVE-2020-12526?
TwinCAT OPC UA Server and IPC Diagnostics UA Server versions up to specified versions are susceptible to denial of service attacks due to crafted requests.
The Impact of CVE-2020-12526
The vulnerability allows attackers to render the OPC UA server unresponsive to client requests, affecting system availability.
Technical Details of CVE-2020-12526
Vulnerability Description
Crafted requests to the OPC UA server cause unresponsiveness without affecting real-time IPC functionality.
Affected Systems and Versions
- TwinCAT OPC UA Server <= 2.3.0.12
- IPC Diagnostics UA Server <= 3.1.0.1
- TF6100 <= 3.3.18
Exploitation Mechanism
- Attacker sends specific requests to the OPC UA server, leading to unresponsiveness.
Mitigation and Prevention
Immediate Steps to Take
- Update Windows devices with recent OPC UA server versions.
- For Windows CE devices, request and apply a recent image from Beckhoff's support.
- Use specified firmware version for CX8091.
Long-Term Security Practices
- Consider disabling IPC Diagnostics Server or limit access to the TCP port.
Patching and Updates
- Regularly update systems with the latest OPC UA server versions.