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GE Proficy HMI/SCADA Cimplicity Integer Overflow

Low RiskICS-CERT ICSA-12-341-01Sep 9, 2012
Summary

GE Proficy HMI/SCADA CIMPLICITY contains an integer overflow vulnerability (CWE-20) in versions 4.01 and later. An integer overflow condition could be triggered by specially crafted input, potentially causing application crashes and loss of HMI functionality. The vulnerability affects all versions of Proficy Process Systems with CIMPLICITY and Proficy HMI/SCADA CIMPLICITY from version 4.01 onwards. No patch has been released by GE Vernova for this issue.

What this means
What could happen
An attacker with network access to the HMI/SCADA system could trigger an integer overflow condition that may cause the Cimplicity application to crash, disrupting plant visibility and potentially halting remote monitoring and control of critical process equipment.
Who's at risk
Energy and manufacturing operators using GE Proficy HMI/SCADA Cimplicity systems for process monitoring and control should be concerned. This affects all versions of Cimplicity and Proficy Process Systems with Cimplicity at version 4.01 and later. These systems typically manage visibility and control of critical infrastructure including power generation, distribution, and industrial manufacturing processes.
How it could be exploited
An attacker with network connectivity to the Cimplicity server could send a specially crafted input that triggers an integer overflow in the application. This could cause memory corruption or an unhandled exception, leading to application crash and loss of HMI functionality.
Prerequisites
  • Network access to Cimplicity HMI/SCADA server
  • Ability to send malformed input to the vulnerable component
No patch availableRemotely exploitableAffects visibility and control systemsLow EPSS score but long-standing unfixed issue
Exploitability
Low exploit probability (EPSS 0.5%)
Affected products (2)
2 EOL
ProductAffected VersionsFix Status
Proficy HMI/SCADA – CIMPLICITY: >=4.01≥ 4.01No fix (EOL)
Proficy Process Systems with CIMPLICITY: vers:all/*All versionsNo fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGImplement network segmentation and firewall rules to restrict access to Cimplicity servers to only authorized engineering workstations and control systems
WORKAROUNDDisable unnecessary network services on Cimplicity systems if not required for operations
Schedule — requires maintenance window
0/2

Patching may require device reboot — plan for process interruption

HARDENINGMonitor Cimplicity system stability and process logs for unexplained crashes or error conditions that could indicate exploitation attempts
HOTFIXContact GE Vernova to inquire about available security updates or patches for Cimplicity versions in your environment
View full CISA ICS-CERT advisory
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GE Proficy HMI/SCADA Cimplicity Integer Overflow - OTPulse