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             AUSCERT External Security Bulletin Redistribution

  WAGO Ethernet Web-based Management Authentication Bypass Vulnerability
                              3 January 2017


        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: 

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Advisory (ICSA-16-357-02)

WAGO Ethernet Web-based Management Authentication Bypass Vulnerability

Original release date: December 22, 2016

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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.


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


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.


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.




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



This vulnerability could be exploited remotely.


No known public exploits specifically target this vulnerability.


An attacker with a low skill would be able to exploit this vulnerability.


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

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

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.

    CWE-592: Authentication Bypass Issues,
    http://cwe.mitre.org/data/definitions/592.html, web site last accessed
    December 22, 2016.
    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.
    CVSS Calculator,
    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:

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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