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AUSCERT External Security Bulletin Redistribution
ESB-2017.0141
A vulnerability has been identified in Phoenix Contact mGuard devices
19 January 2017
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AusCERT Security Bulletin Summary
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Product: Phoenix Contact mGuard
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Administrator Compromise -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2017-5159
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-17-017-01
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Advisory (ICSA-17-017-01)
CVSS V3 9.8
Original release date: January 17, 2017
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/.
CVSS V3 9.8
ATTENTION: Remotely exploitable/low skill level to exploit
Vendor: Phoenix Contact
Equipment: mGuard
Vulnerability: Software update changes password to default
AFFECTED PRODUCTS
Phoenix Contact reports that the vulnerability affects the following mGuard
products:
Only devices that have been updated to Version 8.4.0 are affected.
IMPACT
This vulnerability could allow an attacker to log into the system with
administrative privileges.
MITIGATION
Phoenix Contact recommends users update to Version 8.4.1 (or higher, if
applicable). If an update to Version 8.4.0 already has been performed, please
change the admin password via WebUI or command line. If SSH or HTTPS access
was possible from untrusted sources after an update to Version 8.4.0, please
flash the device and exchange all private keys and passphrases in the
configuration.
To view the advisory published by Phoenix Contact, navigate to the product
page on www.phoenixcontact.com (link is external) and then find the document
in the various section of the product download page.
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
RESOURCE INJECTION CWE-99
When updating an mGuard device to Version 8.4.0 via the update-upload
facility, the update will succeed, but it will reset the password of the admin
user to its default value.
CVE-2017-5159 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
This vulnerability was discovered by Phoenix Contact.
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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The University of Queensland
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Internet Email: auscert@auscert.org.au
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