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Optimalog Optima PLC Multiple Vulnerabilities

Act NowICS-CERT ICSA-12-271-02Jul 1, 2012
Summary

Optimalog Optima PLC versions 1.5.2 and earlier contain multiple vulnerabilities (CWE-476: null pointer dereference, CWE-835: infinite loop) that could allow an attacker to cause a denial of service or system crash.

What this means
What could happen
An attacker could crash or hang the Optima PLC, interrupting manufacturing processes and halting production until the device is manually recovered and restarted.
Who's at risk
Manufacturing facilities using Optimalog Optima PLC controllers should be concerned, as these devices are commonly used for process control, motion control, and safety-critical functions in production lines and assembly systems.
How it could be exploited
An attacker with network access to the PLC could send specially crafted packets or commands that trigger a null pointer dereference or infinite loop condition, causing the controller to become unresponsive or crash.
Prerequisites
  • Network access to the Optima PLC
  • No authentication required (if exposed on network)
remotely exploitableno authentication requiredlow complexityno patch availablehigh EPSS score (>10%)
Exploitability
High exploit probability (EPSS 13.1%)
Affected products (1)
ProductAffected VersionsFix Status
Optima PLC: <=1.5.2≤ 1.5.2No fix (EOL)
Remediation & Mitigation
0/5
Do now
0/2
HARDENINGImplement network segmentation and firewall rules to restrict network access to the Optima PLC from untrusted sources; allow only authorized engineering workstations and control systems to communicate with the device.
WORKAROUNDMonitor PLC status and implement automated restarts or failover to a redundant controller if the device becomes unresponsive.
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HARDENINGIsolate the Optima PLC on a separate VLAN or air-gapped network segment if possible to prevent direct exposure to untrusted networks.
WORKAROUNDReview vendor advisories and check for any future patches or end-of-life statements for the Optima PLC.
Mitigations - no patch available
0/1
Optima PLC: <=1.5.2 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGDeploy network-based intrusion detection or traffic filtering to monitor for and block abnormal or malicious communications to the PLC.
View full CISA ICS-CERT advisory
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Optimalog Optima PLC Multiple Vulnerabilities - OTPulse