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Siemens WinCC TIA Portal Vulnerabilities

Low RiskICS-CERT ICSA-13-213-02May 4, 2013
Summary

Siemens WinCC TIA Portal versions 11 and early versions of 12 are vulnerable to cross-site request forgery (CSRF) and open redirect attacks (CWE-352, CWE-601). These flaws allow an attacker to trick an authorized engineer into performing unintended actions on the engineering workstation, such as modifying PLC programs or process setpoints. An attacker could craft a malicious link that, when clicked by an engineer with an active WinCC session, sends unauthorized commands to the workstation.

What this means
What could happen
An attacker could perform unauthorized actions on a WinCC TIA Portal engineering workstation through cross-site request forgery or open redirect attacks, potentially allowing modification of industrial process configurations without proper authorization logging.
Who's at risk
WinCC TIA Portal users in manufacturing, water treatment, power generation, and other industrial environments who use the software for engineering and maintaining Siemens PLC systems. This affects anyone designing or modifying automation logic and process controls.
How it could be exploited
An attacker could trick an engineer with WinCC TIA Portal open in a browser into clicking a malicious link or visiting a compromised website. The attack exploits cross-site request forgery or open redirect flaws to send unauthorized commands to the WinCC workstation, potentially modifying PLC programs or process parameters.
Prerequisites
  • WinCC TIA Portal must be running on the target engineering workstation
  • Engineer must have an active WinCC web session or be logged into the engineering environment
  • Attacker must be able to get the engineer to click a malicious link (social engineering or compromised website)
Affects engineering workstations (high-trust targets)No patch available for V11 (end-of-life)Limited patch availability (V12 SP1 not yet released at time of advisory)Could allow unauthorized process configuration changes
Exploitability
Low exploit probability (EPSS 0.5%)
Affected products (2)
1 with fix1 EOL
ProductAffected VersionsFix Status
WinCC (TIA Portal) V12: <V12_SP1<V12 SP1V12_SP1
WinCC (TIA Portal) V11: vers:all/*All versionsNo fix (EOL)
Remediation & Mitigation
0/5
Do now
0/1
WORKAROUNDEducate engineers on security risks: warn against clicking links from untrusted sources while WinCC sessions are active
Schedule — requires maintenance window
0/1

Patching may require device reboot — plan for process interruption

WinCC (TIA Portal) V12: <V12_SP1
HOTFIXUpgrade WinCC TIA Portal V12 to SP1 or later when available
Mitigations - no patch available
0/3
WinCC (TIA Portal) V11: vers:all/* has reached End of Life. The vendor will not release a patch. Apply the following compensating controls:
HARDENINGImplement browser security controls: disable auto-open of untrusted links, configure Content Security Policy headers if WinCC supports them
HARDENINGRestrict engineering workstation access: only authorized personnel should have network access to WinCC systems; segment engineering workstations from general corporate network
HARDENINGEnforce strong authentication and session management: require re-authentication for sensitive operations like program uploads to PLCs
View full CISA ICS-CERT advisory
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