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CVSS v3 9.8
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: Advantech B+B SmartWorx
Vulnerability: Use of Client-Side Authentication
The following versions of MESR901, a Modbus gateway, are affected:
- MESR901 firmware versions 1.5.2 and prior.
Successful exploitation of this vulnerability could allow an unauthenticated user to bypass authentication and access restricted pages.
Advantech B+B SmartWorx is unable to provide mitigations for this product and is working to replace the product with a new model. Advantech B+B SmartWorx recommends that users place the device behind a firewall.
NCCIC/ICS-CERT recommends that 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.
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page. 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 in the ICS‑CERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
Maxim Rupp has identified the vulnerability.
Critical Infrastructure Sector: Critical Manufacturing
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Ottawa, Illinois, and Galway, Ireland
For any questions related to this report, please contact the NCCIC at:
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