Siemens SIMATIC S7-1200 CSRF Vulnerability
Low RiskICS-CERT ICSA-15-239-02May 30, 2015
Summary
SIMATIC S7-1200 CPU family is vulnerable to Cross-Site Request Forgery (CSRF) attacks. The vulnerability allows attackers to perform unauthorized actions on the PLC via crafted web requests, affecting systems running firmware versions below V4.1.3.
What this means
What could happen
An attacker could trick an authenticated engineer into loading a malicious web page that sends unauthorized commands to the S7-1200, potentially altering controller parameters, process setpoints, or triggering program changes without the operator's knowledge or approval.
Who's at risk
Water authorities and electric utilities operating Siemens SIMATIC S7-1200 controllers in any automated process (pumping systems, substation automation, water treatment process control) should be concerned. This affects any facility using S7-1200 PLCs with the web interface enabled for remote engineering or monitoring access.
How it could be exploited
An attacker crafts a malicious web page containing hidden requests targeting the S7-1200's web interface. When an authenticated engineer visits the attacker's page in the same browser session where they are logged into the PLC, the forged request automatically executes with the engineer's credentials, bypassing normal authorization checks.
Prerequisites
- Engineer or authorized user must be authenticated to the S7-1200 web interface
- Engineer must visit an attacker-controlled web page while authenticated to the PLC
- Same browser session must have active session cookies for the S7-1200
requires authentication to exploitlow technical complexityno vendor patch availableengineer must be socially engineered or tricked
Exploitability
Moderate exploit probability (EPSS 4.4%)
Affected products (1)
ProductAffected VersionsFix Status
SIMATIC S7-1200 CPU family: <V4.1.3<V4.1.3No fix (EOL)
Remediation & Mitigation
0/5
Do now
0/3HARDENINGRestrict S7-1200 web interface access to internal networks; do not expose to external-facing systems or untrusted networks
WORKAROUNDImplement firewall rules to limit HTTP/HTTPS traffic to the S7-1200 to known authorized engineering workstations only
WORKAROUNDEducate engineering staff to avoid opening untrusted web pages and links while authenticated to the S7-1200
Schedule — requires maintenance window
0/1Patching may require device reboot — plan for process interruption
HARDENINGDisable or remove the S7-1200 web interface if it is not required for operations
Mitigations - no patch available
0/1SIMATIC S7-1200 CPU family: <V4.1.3 has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGImplement network segmentation to restrict access to S7-1200 web interface to authorized engineering workstations only
CVEs (1)
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