Trihedral Engineering Limited VTScada Integer Overflow Vulnerability
Low RiskICS-CERT ICSA-14-343-02Sep 11, 2014
Summary
Integer overflow vulnerability in Trihedral Engineering Limited VTScada affecting versions 6.5 through 11.1.07. The vulnerability exists in the message processing logic and could be exploited by a network-connected attacker to cause denial of service or potentially execute code. No vendor patch has been released for any affected version branch.
What this means
What could happen
An integer overflow in VTScada could allow an attacker to cause a denial of service or potentially execute arbitrary code on the SCADA server, disrupting monitoring and control of industrial processes.
Who's at risk
Energy sector organizations operating Trihedral VTScada systems (versions 6.5 through 11.1.07) should assess their exposure. This affects any facility using VTScada for SCADA applications including electric utilities, water systems, and industrial control environments where the server is network-connected.
How it could be exploited
An attacker with network access to the VTScada server would send a specially crafted message that triggers an integer overflow condition in the application, potentially overwriting memory or causing a crash that halts the SCADA system.
Prerequisites
- Network access to the VTScada server
- Knowledge of the specific message format that triggers the overflow
no patch availableaffects SCADA systemsinteger overflow can lead to denial of service or code executionold advisory with limited details
Exploitability
Moderate exploit probability (EPSS 1.5%)
Affected products (3)
3 EOL
ProductAffected VersionsFix Status
VTS: >=6.5|<=9.1.19≥ 6.5|≤ 9.1.19No fix (EOL)
VTS: >=10|<=10.2.21≥ 10|≤ 10.2.21No fix (EOL)
VTScada: >=11.0|<=11.1.07≥ 11.0|≤ 11.1.07No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2HARDENINGNetwork segmentation: Restrict VTScada server access to only authorized engineering workstations and control networks. Block external network access to the SCADA server from the internet and untrusted networks.
WORKAROUNDFirewall rules: Implement firewall rules to limit inbound connections to the VTScada server to only necessary ports and IP addresses. Monitor and log all connection attempts.
Schedule — requires maintenance window
0/2Patching may require device reboot — plan for process interruption
HARDENINGMonitor for suspicious activity: Implement logging and alerting for unexpected messages or crashes on the VTScada server. Review system logs regularly for signs of exploitation attempts.
HARDENINGContact Trihedral Engineering for security guidance: Engage the vendor to understand available mitigations or potential patches for your specific deployed version.
CVEs (1)
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