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IOServer Master Station Improper Input Validation

Low RiskICS-CERT ICSA-13-213-03May 4, 2013
Summary

IOServer Master Station contains improper input validation in Beta2041.exe and driver19.exe that could allow an attacker to send malformed data to the station. The vulnerability exists in how the software processes input, potentially causing unexpected behavior or crashes. No vendor patches are available for this issue.

What this means
What could happen
Improper input validation in IOServer Master Station could allow an attacker to send malformed data to the station, potentially causing unexpected behavior, crashes, or process disruption in industrial control systems that rely on this software.
Who's at risk
Water utilities, electric utilities, and other critical infrastructure operators using IOServer Master Station for industrial process control and field device communication. This affects any organization relying on Beta2041.exe or driver19.exe for supervisory control operations.
How it could be exploited
An attacker with network access to the IOServer Master Station could send specially crafted input that bypasses validation checks, causing the application to malfunction or crash, disrupting communication with connected field devices and control systems.
Prerequisites
  • Network access to IOServer Master Station
  • Knowledge of IOServer communication protocol or input format
no patch availableremotely exploitableaffects control system communicationslegacy software
Exploitability
Low exploit probability (EPSS 0.5%)
Affected products (2)
2 pending
ProductAffected VersionsFix Status
IOServer: Beta2041.exeBeta2041.exeNo fix yet
IOServer: <driver19.exe<driver19.exeNo fix yet
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDDeploy a firewall rule to limit inbound connections to IOServer Master Station to known trusted networks and restrict unnecessary ports
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HARDENINGMonitor IOServer processes (Beta2041.exe, driver19.exe) for unexpected crashes or unusual behavior that may indicate exploitation attempts
Long-term hardening
0/2
HARDENINGImplement network segmentation to restrict access to IOServer Master Station to authorized engineering and operations staff only
HARDENINGEvaluate replacing or upgrading IOServer with a supported version or alternative software, as vendor has not provided patches for this vulnerability
View full CISA ICS-CERT advisory
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IOServer Master Station Improper Input Validation - OTPulse