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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-18-011-03) PHOENIX CONTACT FL SWITCH
12 January 2018
AusCERT Security Bulletin Summary
Product: PHOENIX CONTACT FL SWITCH
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Access Privileged Data -- Existing Account
CVE Names: CVE-2017-16743 CVE-2017-16741
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PHOENIX CONTACT FL SWITCH
Original release date: January 11, 2018
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: PHOENIX CONTACT
Equipment: FL SWITCH
Vulnerabilities: Improper Authorization, Information Exposure
All FL SWITCH 3xxx, 4xxx, and 48xxx Series products running firmware Version
1.0 to 1.32 are affected.
Successful exploitation of these vulnerabilities may allow an unauthenticated
remote attacker to gain administrative privileges and expose information to
PHOENIX CONTACT recommends that affected users upgrade to firmware Version 1.33
or higher. The updated firmware may be downloaded from the following locations:
o FL SWITCH 3005:
o FL SWITCH 3005T:
o FL SWITCH 3004T-FX
o FL SWITCH 3004T-FX ST
o FL SWITCH 3008
o FL SWITCH 3008T
o FL SWITCH 3006T-2FX
o FL SWITCH 3006T-2FX ST
o FL SWITCH 3012E-2SFX
o FL SWITCH 3016E
o FL SWITCH 3016
o FL SWITCH 3016T
o FL SWITCH 3006T-2FX SM
o FL SWITCH 4008T-2SFP
o FL SWITCH 4008T-2GT-4FX SM
o FL SWITCH 4008T-2GT-3FX SM
o FL SWITCH 4808E-16FX LC-4GC
o FL SWITCH 4808E-16FX SM-4GC
o FL SWITCH 4808E-16FX SM ST-4GC
o FL SWITCH 4808E-16FX ST-4GC
o FL SWITCH 4808E-16FX-4GC
o FL SWITCH 4808E-16FX SM LC-4GC
o FL SWITCH 4012T 2GT 2FX
o FL SWITCH 4012T-2GT-2FX ST
o FL SWITCH 4824E-4GC
o FL SWITCH 4800E-24FX-4GC
o FL SWITCH 4800E-24FX SM-4GC
o FL SWITCH 4800E-24FX SM-4GC
o FL SWITCH 3012E-2FX SM
o FL SWITCH 4000T-8POE-2SFP-R
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the
risk of exploitation of these vulnerabilities. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet.
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o 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 these vulnerabilities.
IMPROPER AUTHORIZATION CWE-285
A remote unauthenticated attacker may be able to craft special HTTP requests
allowing an attacker to bypass web-service authentication allowing the attacker
to obtain administrative privileges on the device.
CVE-2017-16743 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/
INFORMATION EXPOSURE CWE-200
A remote unauthenticated attacker may be able to use Monitor Mode on the device
to read diagnostic information.
CVE-2017-16741 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:L/
Ilya Karpov and Evgeniy Druzhinin of Positive Technologies discovered these
vulnerabilities. PHOENIX CONTACT reported to CERT@VDE that their products are
affected. CERT@VDE coordinated these vulnerabilities with ICS-CERT.
Critical Infrastructure Sectors: Communications, Critical Manufacturing,
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
For any questions related to this report, please contact the NCCIC at:
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information: http://
or incident reporting: https://ics-cert.us-cert.gov/Report-Incident?
The NCCIC 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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