Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2135 Advisory (ICSA-17-236-01) Westermo MRD-305-DIN, MRD-315, MRD-355, and MRD-455 25 August 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: MRD-305-DIN MRD-315 MRD-355 MRD-455 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote/Unauthenticated Cross-site Request Forgery -- Remote with User Interaction Unauthorised Access -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2017-12709 CVE-2017-12703 CVE-2017-5816 Reference: ESB-2017.1615.2 ESB-2017.1221 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-236-01 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-236-01) Westermo MRD-305-DIN, MRD-315, MRD-355, and MRD-455 Original release date: August 24, 2017 Legal Notice All information products included in http://ics-cert.us-cert.gov are provided "as is" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information 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 Vendor: Westermo 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 AFFECTED PRODUCTS The following Westermo router models and firmware versions are affected: MRD-305-DIN versions older than 1.7.5.0, and MRD-315, MRD-355, MRD-455 versions older than 1.7.5.0 IMPACT 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. MITIGATION Westermo recommends that users update to the latest firmware version 1.7.7.0. 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 external) 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. VULNERABILITY OVERVIEW 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 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H). 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 (AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). 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 (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N). RESEARCHER Mandar Jadhav from Qualys Security has identified the vulnerabilities. BACKGROUND Critical Infrastructure Sectors: Commercial Facilities, Critical Manufacturing, and Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: Sweden Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) Toll Free: 1-877-776-7585 International Callers: (208) 526-0900 For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov 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 product. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWZ9r8ox+lLeg9Ub1AQiTAhAAnRl9NfiZpE736zLLwpL5XFW59D0FlhWn Wv/V8aOjGAKXGgE4MIFzmQNkJyPJ+wK0k6Ssy5gbMgWbW6jbSCtlQkNZS/DKJzwV C2nMgnrA21p+WCBMPHhduXze9r/Bzcu42Tocrg85i3OfHIN3LErNIxJH3s+DYGXy HXFOWFoBu/d5DKnm4KWcu93Po45tpcw57bIQE3ODH1EH6yF3hOc/5LN7W3SDhhWK ZJjvdD9G2X+xx6WlDdMYNfKbcA0eGpUmSeDFwwcBXLX9QbTa88ngpmfsx3+GhUR5 LTazpb5/YyhoqNQ2HH5O76cl8ILOm4VjWF4Dt4OmlHbdgOMcEQYq1RitoHlb/24H aQWhAk075+tQRiLtdmxqqVdijiDvuKwwGA2b4vlODbFhDinIfYQ/KXYOm/ikyN6N vOIsa6QljtD5gGL8LNiz4e9fAXESxjHxb1luppp3vaE0xFxvnchzOLKcSXDUaWK/ lR4Yb8wJGe+gUrtrbIo2etFkRAJw5EMpKquhlodUme9e+IaOTa2RBKYUGVSVuNT1 jFTFkA5Ik6B9zotz3tSZ6SaJoxePRnyHhMbuzuj7E/BJDrXWNLkYO9P63ft4xj// X53FBKHxI8eMKc/YowgTgTeXo63vXKnYsdweqGtAoTJGUUg5i3bL0+lUp5vgMRl1 lOsehtPYmeM= =59Tg -----END PGP SIGNATURE-----