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Siemens SIMATIC S7-1200 Improper Input Validation Vulnerabilities

Low RiskICS-CERT ICSA-14-079-01Dec 21, 2014
Summary

SIMATIC S7-1200 PLC family (firmware versions below V4.0.0) contains improper input validation vulnerabilities in network communication handling. An attacker can send specially crafted network input that the PLC does not properly validate, potentially causing malfunction or denial of service. The vulnerabilities are in the PLC's handling of incoming network packets on its industrial protocol interface. No vendor patch is available for affected versions.

What this means
What could happen
An attacker with network access to a SIMATIC S7-1200 PLC could send specially crafted input to exploit improper validation, potentially causing the device to malfunction, stop responding to legitimate commands, or behave unpredictably in ways that could disrupt manufacturing processes.
Who's at risk
Manufacturing facilities using SIMATIC S7-1200 PLCs for process control, including discrete manufacturing, batch processing, and assembly lines. Any organization relying on S7-1200 as a critical control device should prioritize mitigation. This includes automotive, pharmaceutical, food processing, and general industrial automation sectors.
How it could be exploited
An attacker with network access to the PLC sends malformed or unexpected input via the network interface. The PLC fails to properly validate this input before processing it, leading to unexpected behavior or denial of service. The attack requires knowledge of the PLC's communication protocol but no authentication.
Prerequisites
  • Network connectivity to SIMATIC S7-1200 PLC on its industrial network or remotely accessible port
  • Knowledge of Siemens S7 communication protocol (S7 protocol or equivalent)
No patch available (end-of-life product)Remotely exploitable if network-accessibleLow complexity attackAffects critical control logicDefault or predictable S7 communication protocols
Exploitability
Low exploit probability (EPSS 0.3%)
Affected products (1)
ProductAffected VersionsFix Status
SIMATIC S7-1200 PLC family: <V4.0.0<V4.0.0No fix (EOL)
Remediation & Mitigation
0/4
Do now
0/2
HARDENINGImplement network segmentation to isolate SIMATIC S7-1200 PLCs from untrusted networks; restrict access to the PLC to only authorized engineering workstations and control systems
WORKAROUNDDeploy network access controls (firewall rules, ACLs) to block unauthorized connections to the PLC's communication ports (typically port 102 for S7 protocol)
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HARDENINGMonitor network traffic to and from S7-1200 PLCs for anomalous or malformed packets
Mitigations - no patch available
0/1
SIMATIC S7-1200 PLC family: <V4.0.0 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGEvaluate migration to newer SIMATIC S7-1200 hardware versions (V4.0.0 or later) or alternative PLC platforms with vendor support for security patches
View full CISA ICS-CERT advisory
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Siemens SIMATIC S7-1200 Improper Input Validation Vulnerabilities - OTPulse