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Sielco Sistemi Winlog Buffer Overflow

Low RiskICS-CERT ICSA-11-298-01AJul 28, 2011
Summary

Sielco Sistemi Winlog Lite and Winlog PRO versions prior to 2.07.09 contain a buffer overflow vulnerability (CWE-119). The vulnerability can be triggered by crafted input, potentially leading to application crash or arbitrary code execution on the HMI workstation. Affected versions have no vendor patch available and are considered end-of-life or unsupported.

What this means
What could happen
A buffer overflow in Winlog could allow an attacker to crash the application or potentially execute arbitrary code on the workstation running the HMI/SCADA software, disrupting monitoring and control of industrial processes.
Who's at risk
Water authorities and utilities using Sielco Sistemi Winlog Lite or Winlog PRO for HMI (Human Machine Interface) or SCADA monitoring and control. This affects engineering workstations and control system terminals that rely on Winlog for real-time process visualization and operator interaction.
How it could be exploited
An attacker would need to send a specially crafted message or input to the Winlog application (likely via network communication or a malicious file). The overflow condition could corrupt memory and overwrite the program execution flow, allowing code execution or a denial of service.
Prerequisites
  • Access to the system running Winlog Lite or Winlog PRO
  • Ability to send crafted input to the Winlog application (network message, file, or local access)
no patch availablebuffer overflow vulnerabilityaffects HMI/SCADA softwarelow EPSS score but legacy system
Exploitability
Moderate exploit probability (EPSS 6.6%)
Affected products (2)
2 EOL
ProductAffected VersionsFix Status
Winlog Lite: <2.07.09<2.07.09No fix (EOL)
Winlog PRO: <2.07.09.<2.07.09.No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGIsolate Winlog systems from untrusted networks; restrict network access to HMI/SCADA workstations running Winlog to only authorized engineering and control devices
WORKAROUNDImplement input validation and firewall rules to block suspicious or malformed messages to Winlog systems
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HARDENINGMonitor Winlog application logs for unexpected crashes or errors that could indicate exploitation attempts
Mitigations - no patch available
0/1
The following products have reached End of Life with no planned fix: Winlog Lite: <2.07.09, Winlog PRO: <2.07.09.. Apply the following compensating controls:
HARDENINGEvaluate migration to alternative HMI/SCADA software with active vendor support and regular security updates
View full CISA ICS-CERT advisory
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Sielco Sistemi Winlog Buffer Overflow - OTPulse