Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies g. ICS-CERT also provides a section for control systems security recommended practices on the US-CERT Web page. When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPN is only as secure as the connected devices.Locate control system networks and remote devices behind firewalls, and isolate them from the business network.Critical devices should not directly face the Internet. Minimize network exposure for all control system devices.ICS-CERT encourages asset owners to take additional defensive measures to protect against this and other cybersecurity risks. Deactivate the S7-1200 Web server wherever possible.įor this version of firmware (3.0.2), Siemens has also removed the HTTP PUT functionality, because it is not used by the S7-1200 Web server.Utilize a modern Web browser with integrated XSS filtering mechanisms.Disable JavaScript within the Web browser used to access the S7-1200 Web server.
SIEMENS WEB SECURITY FOR PLC UPDATE
Siemens also advises users who are unable to apply this firmware update to use the following mitigations. It recommends users obtain the new updated firmware for Versions 3.0.0 and 3.0.1 of the S7-1200 by contacting Technical Support in their region: Siemens has released a security advisory f DifficultyĪn attacker with medium skill level would be able to exploit this vulnerability. No known public exploits specifically target this vulnerability. This vulnerability could be exploited remotely. A CVSS v2 base score of 8.3 has been assigned the CVSS vector string is (AV:N/AC:M/Au:N/C:P/I:P/A:C). Various actions could be triggered by running malicious JavaScript code, including modification of browser content delivered from the PLC stealing data, such as session cookies issuing commands in the guise of the user to the PLC’s Web server.
SIEMENS WEB SECURITY FOR PLC CODE
If a user is enticed into passing specially crafted, malicious input to the S7-1200 Web application via an HTTP request (e.g., by clicking on a malicious URL with embedded JavaScript), JavaScript code can be returned and may then be executed by the user’s browser. The Web application does not filter user input in a way that prevents cross-site scripting. Vulnerability Characterization Vulnerability Overview Cross-Site Scripting c Products in the Siemens SIMATIC S7-1200 PLC family have been designed for process control in industrial environments such as manufacturing, power generation and distribution, food and beverages, and chemical industries worldwide. ICS-CERT recommends that organizations evaluate the impact of these vulnerabilities based on their operational environment, architecture, and product implementation. Impact to individual organizations depends on many factors that are unique to each organization. Malicious code can execute various actions such as modify browser contents delivered from the PLC, steal session data, and issue commands from the PLC’s Web server. Siemens reports that the vulnerabilities affect the following versions of S7-1200 PLCs:Īn attacker that successfully exploits this vulnerability can run malicious JavaScript code on the target machine. This vulnerability can be exploited remotely. This vulnerability affects the electric, critical manufacturing, chemical, and food and beverage sectors. Siemens has provided mitigations and a firmware update to fix this vulnerability.Įxploitation of this vulnerability would allow an attacker to partially modify application data and limit the availability of the device. Positive Technologies bĭiscovered this vulnerability and reported it directly to Siemens. This advisory provides mitigation details provided by Siemens for a vulnerability that impacts the Siemens S7-1200 Web Application Module.Ī cross-site scripting (XSS) vulnerability in Siemens’s S7-1200 Programmable Logic Controllers (PLCs).
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