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AUSCERT External Security Bulletin Redistribution
ESB-2017.1089
Advisory (ICSA-17-122-03) Advantech B+B SmartWorx MESR901
3 May 2017
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AusCERT Security Bulletin Summary
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Product: Advantech B+B SmartWorx Modbus MESR901
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Alternate Program
CVE Names: CVE-2017-7909
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-122-03
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Advisory (ICSA-17-122-03)
Advantech B+B SmartWorx MESR901
Original release date: May 02, 2017
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 9.8
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: Advantech B+B SmartWorx
Equipment: MESR901
Vulnerability: Use of Client-Side Authentication
AFFECTED PRODUCTS
The following versions of MESR901, a Modbus gateway, are affected:
MESR901 firmware versions 1.5.2 and prior.
IMPACT
Successful exploitation of this vulnerability could allow an unauthenticated
user to bypass authentication and access restricted pages.
MITIGATION
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.
VULNERABILITY OVERVIEW
USE OF CLIENT-SIDE AUTHENTICATION CWE-603
The web interface uses JavaScript to check client authentication and
redirect unauthorized users. Attackers may intercept requests and bypass
authentication to access restricted web pages.
CVE-2017-7909 has been assigned to this vulnerability. A CVSS v3
base score of 9.8 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
RESEARCHER
Maxim Rupp has identified the vulnerability.
BACKGROUND
Critical Infrastructure Sector: Critical Manufacturing
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Ottawa, Illinois, and Galway, Ireland
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
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Internet Email: auscert@auscert.org.au
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