CVE-2019-18269 : Exploit Details and Defense Strategies

Omron's CS and CJ series PLCs have an unrestricted externally accessible lock vulnerability.

Understanding CVE-2019-18269

The lock vulnerability of Omron's CS and CJ series PLCs can be accessed externally without any restrictions.

What is CVE-2019-18269?

The vulnerability in Omron PLC CJ and CS series allows external control or influence over the lock, bypassing intended security measures.

The Impact of CVE-2019-18269

Attackers can manipulate the lock externally, compromising the security of the affected PLCs.

Technical Details of CVE-2019-18269

Vulnerability Description

CWE-412: Unrestricted Externally Accessible Lock

Affected Systems and Versions

Omron PLC CJ Series: all versions
Omron PLC CS series: all versions
Omron PLC NX1P2 series: not affected

Exploitation Mechanism

Actors outside the intended control sphere can influence the lock on the affected PLCs.

Mitigation and Prevention

Immediate Steps to Take

Filter FINS port with a firewall to block unnecessary remote access.
Filter IP addresses to restrict access to the PLC.

Long-Term Security Practices

Regularly update firmware and security patches.
Implement network segmentation to isolate critical devices.
Conduct security assessments and audits periodically.

Patching and Updates

Refer to Omron's security advisory for detailed mitigation measures.