OTPulse

ICSA-19-192-03 Siemens TIA Administrator (TIA Portal)

Plan PatchCVSS 8ICS-CERT ICSA-19-192-03Jul 9, 2019
Siemens
Attack path
Attack VectorLocal
Auth RequiredNone
ComplexityLow
User InteractionNone needed
Summary

TIA Administrator versions prior to v1.0 SP1 Upd1 contain a privilege escalation vulnerability (CWE-306) that allows an attacker with local system access to execute arbitrary code or commands with elevated privileges. The vulnerability has a CVSS score of 8.0 (high severity) with potential for significant impact on system configuration and safety logic. No public exploits are currently known, and the vulnerability is not remotely exploitable. Siemens recommends updating to v1.0 SP1 Upd1 or later and restricting network access to port 8888/TCP.

What this means
What could happen
An attacker with local access to a machine running TIA Administrator could execute arbitrary commands or modify configuration data, potentially altering engineering settings or disabling safety-critical automation logic on connected Siemens systems.
Who's at risk
This affects Siemens automation engineers and operators who use TIA Portal (TIA Administrator) to program and maintain Siemens S7 PLCs, drives, and other industrial automation equipment. Any organization using Siemens TIA Portal for SCADA, process control, or safety system engineering should assess their exposure.
How it could be exploited
An attacker must have local code execution or direct terminal access on the engineering workstation running TIA Administrator. They can then exploit the privilege escalation vulnerability to gain elevated rights and modify industrial automation configurations or execute commands with system privileges.
Prerequisites
  • Local access to the TIA Administrator workstation (physical or remote desktop/SSH)
  • TIA Administrator version earlier than v1.0 SP1 Upd1 installed on the target machine
  • Ability to execute code or commands on the local system
Low complexity exploitationRequires local access (not remotely exploitable)Affects engineering/configuration workstations which often have high-privileged access to production systems
Exploitability
Some exploitation risk — EPSS score 5.8%
Public Proof-of-Concept (PoC) on GitHub (1 repository)
Affected products (1)
ProductAffected VersionsFix Status
TIA Administrator<V1.0 SP1 Upd1v1.0 SP1 Upd1
Remediation & Mitigation
0/4
Do now
0/1
WORKAROUNDRestrict network access to port 8888/TCP to localhost only (block external connections to this port)
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

HOTFIXUpdate TIA Administrator to version 1.0 SP1 Upd1 or later
Long-term hardening
0/2
HARDENINGIsolate engineering workstations running TIA Administrator from the business network; keep them on a dedicated engineering network behind a firewall
HARDENINGLimit physical and remote access to machines running TIA Administrator to authorized engineering personnel only
View full CISA ICS-CERT advisory
API: /api/v1/advisories/8078d9c3-d681-4b96-ad9b-78dd4af7a02b

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ICSA-19-192-03 Siemens TIA Administrator (TIA Portal) | CVSS 8 - OTPulse