ESB-2017.2135 - ALERT [Appliance] Westermo MRD: Multiple vulnerabilities 2017-08-25

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             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

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        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

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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.

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