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AUSCERT External Security Bulletin Redistribution
ESB-2017.0012
Fidelix FX-20 Series Controllers Path Traversal Vulnerability
3 January 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Fidelix FX-20
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-9364
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-357-01
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Advisory (ICSA-16-357-01)
Fidelix FX-20 Series Controllers Path Traversal Vulnerability
Original release date: December 22, 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
Researcher Semen Rozhkov of Kaspersky Lab has identified a path traversal
vulnerability in Fidelix's FX-20 series controllers. Fidelix has produced
a new software version to mitigate this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
Fidelix reports that the vulnerability affects the following versions of
FX-20 series controllers:
FX-20 series controllers, versions prior to 11.50.19
IMPACT
Successful exploitation of this vulnerability may give an attacker the
ability to read data from the device. The attacker cannot write data.
Impact to individual organizations depends on many factors that are unique
to each organization. NCCIC/ICS-CERT recommends that organizations evaluate
the impact of this vulnerability based on their operational environment,
architecture, and product implementation.
BACKGROUND
Fidelix is a Finland-based company.
The affected products, FX-20 series controllers, are building
controllers. According to Fidelix, FX-20 series controllers are deployed
across several sectors including Commercial Facilities. Fidelix estimates
that these products are used primarily in Europe.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
PATH TRAVERSAL[a]
Arbitrary file reading via path traversal allows an attacker to access
arbitrary files and directories on the server.
CVE-2016-9364[b] has been assigned to this vulnerability. A CVSS
v3 base score of 7.5 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N).[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
Fidelix has released a new software version, 11.50.19, to address this
vulnerability. Users can obtain the new version by contacting a local
distributor or Fidelix support at:
support@fidelix.fi
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.
a.
CWE-22: Improper Limitation of a Pathname to a Restricted Directory
('Path Traversal'), https://cwe.mitre.org/data/definitions/22.html,
web site last accessed December 22, 2016.
b.
NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9364,
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
c.
VSS 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 December 22, 2016.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
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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===========================================================================
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The University of Queensland
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Qld 4072
Internet Email: auscert@auscert.org.au
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