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AUSCERT External Security Bulletin Redistribution
ESB-2017.0013
WAGO Ethernet Web-based Management Authentication Bypass Vulnerability
3 January 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: WAGO 750-8202/PFC200
WAGO 750-881
WAGO 0758-0874-0000-0111
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Modify Arbitrary Files -- Remote/Unauthenticated
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-9362
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-357-02
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Advisory (ICSA-16-357-02)
WAGO Ethernet Web-based Management Authentication Bypass 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
Independent researcher Maxim Rupp has identified an authentication bypass
vulnerability in WAGO's Ethernet Web-based Management products. WAGO has
produced firmware and workarounds to mitigate this vulnerability.
This vulnerability could be exploited remotely.
AFFECTED PRODUCTS
WAGO reports that the vulnerability affects the following products:
WAGO 750-8202/PFC200 prior to FW04 (released August 2015),
WAGO 750-881 prior to FW09 (released August 2016), and
WAGO 0758-0874-0000-0111
IMPACT
An attacker who exploits this vulnerability could be able to view and edit
settings without authenticating.
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
WAGO is an international company based in Germany. They operate production
facilities in Germany, Switzerland, Poland, China, and India. WAGO maintains
offices worldwide.
According to WAGO, its products are deployed across several sectors including
Commercial Facilities, Critical Manufacturing, Energy, and Transportation
Systems. WAGO estimates that these products are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
AUTHENTICATION BYPASS ISSUE[a]
By accessing a specific uniform resource locator (URL) on the web server,
a malicious user is able to edit and to view settings without authenticating.
CVE-2016-9362[b] has been assigned to this vulnerability. A CVSS
v3 base score of 9.1 has been calculated; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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
WAGO recommends the following use conditions for Ethernet devices:
If not otherwise specified, Ethernet devices are intended for use on local
networks. Users should note the following when using Ethernet devices:
Do not connect control components and control networks to an open
network such as the Internet or an office network. WAGO recommends
putting control components and control networks behind a firewall.
Limit physical and electronic access to all automation components to
authorized personnel only.
Change the default passwords before first use. This will reduce the
risk of unauthorized access to systems.
Regularly change passwords. This will reduce the risk of unauthorized
access to systems.
If remote access to control components and control networks is required,
use a Virtual Private Network (VPN).
Regularly perform threat analyses. Check whether the measures taken
meet company security requirements.
Use "defense-in-depth" mechanisms in the system's security configuration
to restrict the access to and control of individual products and
networks.
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.
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 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
(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-592: Authentication Bypass Issues,
http://cwe.mitre.org/data/definitions/592.html, web site last accessed
December 22, 2016.
b.
NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9362,
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 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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