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7-Technologies IGSS Buffer Overflow

Act NowICS-CERT ICSA-11-355-01Sep 23, 2011
Summary

A buffer overflow vulnerability exists in 7-Technologies Interactive Graphical SCADA System (IGSS) version 9.0.0.11355 and earlier. The vulnerability is triggered by specially crafted input to an unspecified component and allows arbitrary code execution. Affected versions are no longer patched by the vendor, requiring defensive network measures and eventual migration away from the product.

What this means
What could happen
A buffer overflow in IGSS could allow an attacker to execute arbitrary code on the SCADA workstation, potentially gaining control of process monitoring and command functionality in energy generation, transmission, or distribution systems.
Who's at risk
Energy sector operators using IGSS in version 9.0.0.11355 or earlier should be concerned, including staff responsible for SCADA workstations in generation facilities, transmission control centers, and distribution automation systems. Any organization still running this version on Internet-connected or DMZ-accessible networks is at elevated risk.
How it could be exploited
An attacker with network access to the IGSS workstation could send a specially crafted message or input to the vulnerable component. The buffer overflow would allow code execution in the context of the IGSS application, bypassing normal operational controls.
Prerequisites
  • Network access to the IGSS workstation on the port used by the vulnerable component
  • No authentication required to trigger the buffer overflow
remotely exploitableno authentication requiredno patch availablebuffer overflow vulnerabilitymoderate exploit probability (20.2% EPSS)
Exploitability
High exploit probability (EPSS 20.2%)
Affected products (1)
ProductAffected VersionsFix Status
Interactive Graphical SCADA System: <=9.0.0.11355≤ 9.0.0.11355No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGImplement strict network segmentation to restrict access to IGSS workstations from untrusted network segments. Use firewalls to allow only essential administrative and operator traffic.
HARDENINGDeploy network-based intrusion detection/prevention system (IDS/IPS) rules to monitor for and block exploitation attempts targeting IGSS buffer overflow vulnerabilities.
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

WORKAROUNDConduct a risk assessment to determine if affected IGSS instances are still in use in critical operational roles. Prioritize transition away from affected versions where possible.
Mitigations - no patch available
0/1
Interactive Graphical SCADA System: <=9.0.0.11355 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGImplement application-level access controls and run IGSS under the principle of least privilege to limit the impact if code execution occurs.
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7-Technologies IGSS Buffer Overflow - OTPulse