Siemens SIMATIC STEP 7 TIA Portal Vulnerabilities (Update A)
Low RiskICS-CERT ICSA-15-050-01ANov 22, 2015
Summary
Siemens SIMATIC STEP 7 (TIA Portal) versions V13 (prior to SP1 Update 1) and V12 (prior to SP1 Update 5) contain vulnerabilities related to insecure communication (CWE-300) and use of insufficiently random values (CWE-916). These flaws could allow an attacker with network access to intercept or manipulate communication between engineering workstations and PLCs, potentially enabling unauthorized modification of control programs or device configurations.
What this means
What could happen
An attacker with access to the engineering workstation could modify PLC programs or device configurations during development, potentially altering control logic or safety settings. This could result in unintended process behavior or unsafe operations.
Who's at risk
Water and electric utility operators who use Siemens SIMATIC STEP 7 TIA Portal for programming and configuring PLCs in treatment plants, substations, and distribution networks. This affects engineering teams and system integrators responsible for control system development and maintenance.
How it could be exploited
An attacker with network access to a SIMATIC STEP 7 engineering workstation could intercept or manipulate unencrypted communication between the workstation and connected PLCs, allowing modification of control program content or device settings without authorization.
Prerequisites
- Network access to the engineering workstation running SIMATIC STEP 7 TIA Portal
- Access to the same network segment where PLC communication occurs
- Ability to intercept or modify network traffic between workstation and PLC
No patch availableAffects control system engineering toolsPotential to modify safety-critical control logic
Exploitability
Low exploit probability (EPSS 0.4%)
Affected products (2)
2 EOL
ProductAffected VersionsFix Status
SIMATIC STEP 7 (TIA Portal) V13: <V13_SP1_Upd1<V13 SP1 Upd1No fix (EOL)
SIMATIC STEP 7 (TIA Portal) V12: <V12_SP1_Upd5<V12 SP1 Upd5No fix (EOL)
Remediation & Mitigation
0/5
Do now
0/2HARDENINGRestrict access to engineering workstations to authorized personnel only; use strong authentication and access controls
WORKAROUNDUse VPN or encrypted tunnels when transferring programs or configurations between engineering workstations and PLCs
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
WORKAROUNDVerify program and configuration integrity after download to PLCs using checksums or digital signatures when available
Mitigations - no patch available
0/2The following products have reached End of Life with no planned fix: SIMATIC STEP 7 (TIA Portal) V13: <V13_SP1_Upd1, SIMATIC STEP 7 (TIA Portal) V12: <V12_SP1_Upd5. Apply the following compensating controls:
HARDENINGIsolate engineering workstations running SIMATIC STEP 7 on a dedicated, physically separate network segment with restricted access from production facilities
HARDENINGImplement network monitoring and intrusion detection on engineering workstations to detect unauthorized modification attempts
CVEs (2)
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