CVE-2022-29958 : Security Advisory and Response

JTEKT TOYOPUC PLCs through 2022-04-29 have a vulnerability that does not ensure data integrity, allowing attackers to execute arbitrary machine code on the PLC's CPU module.

Understanding CVE-2022-29958

This CVE affects JTEKT TOYOPUC PLCs due to the unauthenticated CMPLink/TCP protocol used for engineering purposes.

What is CVE-2022-29958?

JTEKT TOYOPUC PLCs are vulnerable to attacks that can lead to the execution of arbitrary machine code on the CPU module, granting attackers full control over the CPU.

The Impact of CVE-2022-29958

The vulnerability allows attackers to bypass cryptographic authentication, potentially causing severe damage to the PLC's operations.

Technical Details of CVE-2022-29958

The vulnerability arises from the lack of cryptographic authentication in downloading control logic to the PLC.

Vulnerability Description

Control logic is downloaded block-by-block to the PLC without cryptographic authentication, enabling attackers to run unauthorized machine code on the CPU.

Affected Systems and Versions

All JTEKT TOYOPUC PLCs through 2022-04-29 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit the unauthenticated CMPLink/TCP protocol to download malicious control logic to the PLC, gaining full control over the CPU.

Mitigation and Prevention

It is crucial to take immediate steps to secure vulnerable JTEKT TOYOPUC PLCs and implement long-term security practices.

Immediate Steps to Take

Disable the unauthenticated CMPLink/TCP protocol and implement network segmentation to limit access to PLCs.

Long-Term Security Practices

Regularly update firmware, monitor network traffic for anomalies, and conduct security audits to ensure the integrity of PLC operations.

Patching and Updates

Apply patches provided by the vendor to address the vulnerability and enhance the security of JTEKT TOYOPUC PLCs.