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Open Automation Software OPC Systems.NET Vulnerability

Act NowICS-CERT ICSA-12-012-01AOct 15, 2012
Summary

OPC Systems.NET versions before 5.0 contain input validation and buffer handling flaws (CWE-20, CWE-119) that can be exploited via network access. A remote attacker can send malformed data to the OPC service to cause a denial of service or potentially execute arbitrary code. No patch is available from the vendor.

What this means
What could happen
An attacker could send specially crafted data to the OPC Systems.NET service, causing a crash or potentially executing arbitrary code on the device. This could disrupt communications between engineering workstations and industrial controllers, halting real-time process monitoring and control.
Who's at risk
Water utilities, power distributors, and manufacturing plants that rely on OPC Systems.NET for real-time data transfer between SCADA systems, PLCs, and engineering workstations are affected. This includes any organization using legacy OPC Classic infrastructure for process monitoring or control on industrial networks.
How it could be exploited
An attacker on the network sends malformed input to the OPC Systems.NET service (typically on port 135 or custom port, depending on configuration). The vulnerability is in input validation (CWE-20) and buffer handling (CWE-119), so oversized or specially formatted data triggers a crash or memory corruption, allowing code execution if the attacker is skilled enough to craft a payload.
Prerequisites
  • Network access to the OPC Systems.NET service port
  • No authentication required
remotely exploitableno authentication requiredlow complexityno patch availablehigh EPSS score (11.2%)
Exploitability
High exploit probability (EPSS 11.2%)
Affected products (1)
ProductAffected VersionsFix Status
OPC Sytems.NET: <5.0<5.0No fix yet
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGIsolate OPC Systems.NET servers from untrusted networks using network segmentation or firewall rules; restrict access to known engineering workstations and SCADA systems only
WORKAROUNDDisable OPC Systems.NET if it is not actively used in your process
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HARDENINGMonitor OPC service for unexpected crashes or connection attempts from unknown sources
HOTFIXEvaluate upgrade to a supported alternative OPC solution
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Open Automation Software OPC Systems.NET Vulnerability - OTPulse