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Freeze the Controller, Defrost the Food: Uncovering Vulnerabilities in Danfoss Refrigeration Controllers
TL;DR
Team82 discovered multiple vulnerabilities in the Danfoss AK-SM 800A refrigeration controllers, including a hidden authentication bypass and command injection flaws, leading to potential remote code execution. These vulnerabilities were disclosed to Danfoss, resulting in a firmware update to address the issues.
✦ Why It Matters
Ensure your refrigeration controllers are updated with the latest firmware to protect against these vulnerabilities.
Key Takeaways
- Regularly update firmware on all refrigeration controllers.
- Monitor for unauthorized access attempts on management interfaces.
- Implement network segmentation to limit exposure of critical systems.
- Conduct regular security assessments of embedded systems.
Full Summary
Danfoss AK-SM 800A controllers are critical for managing refrigeration in commercial settings like supermarkets and warehouses. Team82's research identified serious vulnerabilities in the embedded web management interface, including a hidden 'code-of-the-day' authentication bypass, a command-injection flaw allowing remote code execution, and a configuration injection issue that could disrupt web traffic.
The team analyzed the internet exposure of these devices, discovering thousands of publicly accessible interfaces. By reverse engineering the firmware, they traced vulnerabilities from HTTP request handlers to the underlying code.
These findings highlight how undocumented features and insecure configurations can create significant attack vectors in cyber-physical systems, emphasizing the need for robust security measures.