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Siemens PNI

Act Now9.8ICS-CERT ICSA-23-320-12Nov 14, 2023
Attack VectorNetwork
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

SINEC PNI before version 2.0 contains input validation (CWE-20) and buffer overflow (CWE-787) vulnerabilities. An attacker can send a crafted network request that bypasses input validation, causing memory corruption and allowing remote code execution on the PNI device with no authentication required. This affects all SINEC PNI installations running versions earlier than 2.0.

What this means
What could happen
An attacker with network access to SINEC PNI could execute arbitrary code on the device, potentially compromising the ability to manage industrial network traffic and connectivity across your plant.
Who's at risk
Water and electric utilities with Siemens industrial networks should care about this. It affects SINEC PNI appliances used to manage network communication and traffic in distributed control environments, particularly in plants using SIMATIC systems or Siemens networking infrastructure.
How it could be exploited
An attacker sends a crafted network request to SINEC PNI on its network port. The device fails to validate the input properly (CWE-20) and the malformed data overwrites memory (CWE-787), allowing the attacker to run arbitrary commands on the PNI device.
Prerequisites
  • Network access to SINEC PNI on its listening port
  • No authentication or credentials required
remotely exploitableno authentication requiredlow complexityhigh EPSS score (92.5%)affects network communication infrastructure
Exploitability
High exploit probability (EPSS 92.5%)
Affected products (1)
ProductAffected VersionsFix Status
SINEC PNI<V2.02.0
Remediation & Mitigation
0/3
Do now
0/1
WORKAROUNDRestrict network access to SINEC PNI using firewall rules; allow only authorized engineering workstations and control system devices to connect
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate SINEC PNI to version 2.0 or later
Long-term hardening
0/1
HARDENINGPlace SINEC PNI on a segmented industrial network isolated from business network and internet access
View full CISA ICS-CERT advisory
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