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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-17-341-03) PHOENIX CONTACT FL COMSERVER, FL
COM SERVER, and PSI-MODEM/ETH
8 December 2017
AusCERT Security Bulletin Summary
Product: FL COMSERVER
FL COM SERVER
Operating System: Network Appliance
Impact/Access: Cross-site Scripting -- Remote with User Interaction
CVE Names: CVE-2017-16723
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PHOENIX CONTACT FL COMSERVER, FL COM SERVER, and PSI-MODEM/ETH
Original release date: December 07, 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 8.2
ATTENTION: Remotely exploitable/low skill level to exploit.
Vendor: PHOENIX CONTACT
Equipment: FL COMSERVER, FL COM SERVER, and PSI-MODEM/ETH
Vulnerability: Cross-site Scripting
The following models running firmware versions prior to 1.99, 2.20, or 2.40 of
FL COMSERVER, FL COM SERVER, and PSI-MODEM/ETH, industrial networking
equipment, are affected:
FL COMSERVER BASIC 232/422/485,
FL COMSERVER UNI 232/422/485,
FL COMSERVER BAS 232/422/485-T,
FL COMSERVER UNI 232/422/485-T,
FL COM SERVER RS232,
FL COM SERVER RS485, and
Successful exploitation of this vulnerability may allow a remote attacker to
change configuration variables on the device.
PHOENIX CONTACT has released new firmware versions for the affected devices.
The latest download links can be found at:
https://cert.vde.com/de-de/advisories/vde-2017-004 (link is external)
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 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 this vulnerability.
IMPROPER NEUTRALIZATION OF INPUT DURING WEB PAGE GENERATION ('CROSS-SITE
The cross-site scripting vulnerability has been identified, which may allow
remote code execution.
CVE-2017-16723 has been assigned to this vulnerability. A CVSS v3 base score
of 8.2 has been assigned; the CVSS vector string is
Maxim Rupp reported the vulnerability to ICS-CERT. CERT@VDE (link sends
e-mail) coordinated the disclosure with Mr. Rupp and 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:
Email: NCCICCUSTOMERSERVICE@hq.dhs.gov (link sends e-mail)
Toll Free: 1-888-282-0870
For industrial control systems cybersecurity information:
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
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