Siemens SIMATIC WinCC OA Multiple Vulnerabilities
Low RiskICS-CERT ICSA-14-035-01Nov 7, 2014
Summary
SIMATIC WinCC OA versions prior to 3.12_P002 contain multiple vulnerabilities including code injection (CWE-94), path traversal (CWE-23), insufficient input validation (CWE-20), and improper resource validation (CWE-916). These flaws could allow remote attackers to execute arbitrary code on operator workstations or access sensitive files without authentication.
What this means
What could happen
Multiple vulnerabilities in SIMATIC WinCC OA could allow an attacker to execute arbitrary code or manipulate process parameters on the operator interface system, potentially disrupting plant operations or enabling unauthorized process changes.
Who's at risk
Water and electrical utilities, chemical plants, and any industrial facility using SIMATIC WinCC OA as an operator interface system. This affects human-machine interface (HMI) systems that monitor and control critical processes like water treatment, power distribution, or industrial automation.
How it could be exploited
An attacker with network access to WinCC OA could exploit code injection (CWE-94) or path traversal (CWE-23) flaws to execute commands on the operator workstation or access protected files. This could be combined with insufficient input validation (CWE-20) to bypass security controls.
Prerequisites
- Network access to SIMATIC WinCC OA system (port 4999 or web interface)
- SIMATIC WinCC OA version earlier than 3.12_P002
remotely exploitableno authentication required for some vectorsno patch availablemultiple vulnerability types (code injection, path traversal, input validation)
Exploitability
Moderate exploit probability (EPSS 4.5%)
Affected products (1)
ProductAffected VersionsFix Status
SIMATIC WinCC OA: <3.12_P002<3.12 P002No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/1WORKAROUNDDisable or restrict remote access to WinCC OA if not required for operations; use firewall rules to allow only known operator workstations
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HARDENINGMonitor WinCC OA systems for suspicious process execution or file access attempts using audit logs and SIEM
Mitigations - no patch available
0/2SIMATIC WinCC OA: <3.12_P002 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGImplement network segmentation to isolate WinCC OA operator workstations from untrusted networks and limit access to authorized engineering/operations staff only
HARDENINGApply input validation and access controls at the firewall level to monitor and restrict unusual connections to WinCC OA ports
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