1. EXECUTIVE SUMMARY
- CVSS v3 8.8
- ATTENTION: Exploitable remotely/low skill level to exploit
- Vendor: Siemens
- Equipment: XHQ Operations Intelligence
- Vulnerabilities: Cross-site Request Forgery, Improper Neutralization of Script-Related HTML Tags in a Web Page, Improper Input Validation
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to read or modify contents of the web application.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports these vulnerabilities affects the following Operations Intelligence products:
- XHQ: All versions prior to v188.8.131.52
3.2 VULNERABILITY OVERVIEW
The web interface could allow a cross-site request forgery (CSRF) attack if an unsuspecting user is tricked into accessing a malicious link.
The web interface could allow for an attacker to craft the input in an unexpected form, causing the application to behave in unexpected ways for legitimate users.
The web application requests could be manipulated, causing the application to behave in unexpected ways for legitimate users.
- CRITICAL INFRASTRUCTURE SECTORS: Energy
- COUNTRIES/AREAS DEPLOYED: Worldwide
- COMPANY HEADQUARTERS LOCATION: Germany
Siemens reported these vulnerabilities to CISA.
Siemens recommends users update XHQ Operations Intelligence product line to v184.108.40.206 or later. To obtain the most recent version, please contact the local service organization.
Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk:
- Follow the XHQ documentation to implement a secure IIS configuration.
- Allow only HTTPS communications to XHQ.
As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens’ operational guidelines for industrial security, and follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at:
For more information on these vulnerabilities and more detailed mitigation instructions, please see Siemens security advisory SSA-525454 at the following location:
CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
- Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet.
- Locate control system networks and remote devices behind firewalls, and isolate them from the business network.
- When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices on the ICS webpage on us-cert.gov. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available on the ICS webpage on us-cert.gov in the Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:
- Do not click web links or open unsolicited attachments in email messages.
- Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
- Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks
No known public exploits specifically target these vulnerabilities.