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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-17-236-01) Westermo MRD-305-DIN, MRD-315,
MRD-355, and MRD-455
25 August 2017
AusCERT Security Bulletin Summary
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
Cross-site Request Forgery -- Remote with User Interaction
Unauthorised Access -- Existing Account
CVE Names: CVE-2017-12709 CVE-2017-12703 CVE-2017-5816
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Westermo MRD-305-DIN, MRD-315, MRD-355, and MRD-455
Original release date: August 24, 2017
All information products included in http://ics-cert.us-cert.gov are provided
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contained within. DHS does not endorse any commercial product or service,
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For
more information about TLP, see http://www.us-cert.gov/tlp/.
CVSS v3 7.3
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:
http://www.westermo.com (link is external)
Westermo has also released a security advisory that can be found at:
http://www.westermo.com/solutions/cyber-security/resource-centre (link is
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 ICSCERT 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.
CROSS-SITE REQUEST FORGERY (CSRF) CWE-352
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.
CVE-2017-12703 has been assigned to this vulnerability. A CVSS v3 base score
of 8.8 has been assigned; the CVSS vector string is
USE OF HARD-CODED CREDENTIALS CWE-798
The device utilizes hard-coded credentials, which could allow for unauthorized
local low privileged access to the device.
CVE-2017-12709 has been assigned to this vulnerability. A CVSS v3 base score
of 5.9 has been assigned; the CVSS vector string is
USE OF HARD-CODED CRYTPGRAPHIC KEY CWE-321
The device utilizes hard-coded private cryptographic keys that may allow an
attacker to decrypt traffic from any other source.
CVE-2017-5816 has been assigned to this vulnerability. A CVSS v3 base score of
10.0 has been assigned; the CVSS vector string is
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
For any questions related to this report, please contact ICS-CERT at:
Email: firstname.lastname@example.org (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
ICS-CERT continuously strives to improve its products and services. You can
help by choosing one of the links below to provide feedback about this
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