Westermo MRD-305-DIN, MRD-315, MRD-355, and MRD-455
ICSA： ICS Advisory (ICSA-17-236-01)
CVSS v3 10.0
ATTENTION: Remotely exploitable/low skill level to exploit
Equipment: MRD-305-DIN, MRD-315, MRD-355, and MRD-455
Vulnerabilities: Cross-Site Request Forgery (CSRF), Use of Hard-Coded Credentials, and Use of Hard-Coded Cryptographic Key
The following Westermo router models and firmware versions are affected:
- MRD-305-DIN versions older than 22.214.171.124, and
- MRD-315, MRD-355, MRD-455 versions older than 126.96.36.199
Successful exploitation of these vulnerabilities could allow a remote attacker to obtain hard-coded cryptographic keys, hard-coded credentials, or trick a user into submitting a malicious request, resulting in the attacker gaining unauthorized access to the device and running arbitrary code.
Westermo recommends that users update to the latest firmware version 188.8.131.52. The new version can be downloaded at:
Westermo has also released a security advisory that can be found at:
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. 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 these vulnerabilities.
The application does not verify whether a request was intentionally provided by the user, making it possible for an attacker to trick a user into making a malicious request to the server.
The device utilizes hard-coded credentials, which could allow for unauthorized local low privileged access to the device.
The device utilizes hard-coded private cryptographic keys that may allow an attacker to decrypt traffic from any other source.
Mandar Jadhav from Qualys Security has identified the vulnerabilities.
Critical Infrastructure Sectors: Commercial Facilities, Critical Manufacturing, and Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Sweden