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AUSCERT External Security Bulletin Redistribution
ESB-2016.2356
GE Bently Nevada 3500/22M Improper Authorization Vulnerability
10 October 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: GE Bently Nevada 3500/22M
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-5788
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-252-01
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Advisory (ICSA-16-252-01)
GE Bently Nevada 3500/22M Improper Authorization Vulnerability
Original release date: October 06, 2016
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/.
OVERVIEW
This advisory was originally posted to the US-CERT secure Portal library on
September 8, 2016, and is being released to the NCCIC/ICS-CERT web site.
GE has identified an improper authorization vulnerability in the GE Bently
Nevada 3500/22M monitoring system. GE has produced a new firmware version to
mitigate this vulnerability in the USB version of the GE Bently Nevada
3500/22M monitoring system.
This vulnerability could be exploited remotely.
AFFECTED PRODUCT
The following GE Bently Nevada 3500/22M firmware versions are affected:
- - GE Bently Nevada 3500/22M (USB version), all versions prior to firmware
Version 5.0, and
- - GE Bently Nevada 3500/22M (serial version), all versions.
IMPACT
Successful exploitation of the identified vulnerability may allow a remote
attacker to gain unauthorized access to the affected device with elevated
privileges.
Impact to individual organizations depends on many factors that are unique to
each organization. ICS-CERT recommends that organizations evaluate the impact
of this vulnerability based on their operational environment, architecture,
and product implementation.
BACKGROUND
GE Bently Nevada is a wholly owned subsidiary of GE, a US-based company that
maintains offices in several countries around the world.
The affected product, GE Bently Nevada 3500/22M, is a vibration monitoring
system. According to GE, the GE Bently Nevada 3500/22M is deployed across
several sectors including Chemical and Energy. GE estimates that these
products are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
IMPROPER AUTHORIZATION [a]
Several open ports have been identified on the affected device, which allow
unauthorized access to the device with elevated privileges.
CVE-2016-5788 [b] 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:H). [c]
VULNERABILITY DETAILS
EXPLOITABILITY
This vulnerability could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target this vulnerability.
DIFFICULTY
An attacker with a low skill would be able to exploit this vulnerability.
MITIGATION
GE has released a new firmware version for the GE Bently Nevada 3500/22M TDI
USB monitoring system, Version 5.0. GEs new firmware can only be applied to
the USB version of the GE Bently Nevada 3500/22M monitoring system. Users
registered with a GE Bently Nevada Technical Support Agreement can download
Version 5.0 and access GEs Technical Information Letter (TIL-149700250)
detailing further mitigation strategies at the following URL with a valid
account:
http://www.bntechsupport.com (link is external)
GE recommends that users using the serial version of the GE Bently Nevada
3500/22M upgrade the affected device.
Users who are concerned about the security of their GE Bently Nevada 3500
System should:
- - Employ system hardening techniques for GE Bently Nevadas 3500 System as
outlined in document 106M9733 - 3500 Hardening Guideline. This document is
available through www.bntechsupport.com (link is external).
- - Contact GE Bently Nevada for information regarding installations compliant
to IEC 62443-2-4 Level 1.
- - Implement a bump-in-the-wire solution to provide secure communication
between endpoints, which may enhance security.
- - Effectively segment networks and implement demilitarized zones (DMZs) with
properly configured firewalls to selectively control and monitor traffic
passed between zones.
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 at:
http://ics-cert.us-cert.gov/content/recommended-practices. 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
(http://ics-cert.us-cert.gov/).
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.
a. CWE-285: Improper Authorization,
http://cwe.mitre.org/data/definitions/285.html, web site last accessed October
06, 2016.
b. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-5788, NIST
uses this advisory to create the CVE web site report. This web site will be
active sometime after publication of this advisory.
c. CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed October 06, 2016.
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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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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