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             AUSCERT External Security Bulletin Redistribution

Siemens SIPROTEC 4, SIPROTEC Compact, and Reyrolle Devices using the EN100
                               9 March 2018


        AusCERT Security Bulletin Summary

Product:           Siemens SIPROTEC 4, SIPROTEC Compact, and Reyrolle Devices using the EN100
Publisher:         ICS-CERT
Operating System:  Network Appliance
Impact/Access:     Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-4838  

Original Bulletin: 

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Siemens SIPROTEC 4, SIPROTEC Compact, and Reyrolle Devices using the EN100

Ethernet Communication Module Extension

Original release date: March 08, 2018

Legal Notice

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referenced in this product or otherwise. Further dissemination of this
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header. For more information about TLP, see http://www.us-cert.gov/tlp/.

CVSS v3 7.5

ATTENTION: Exploitable remotely/low skill level to exploit.

Vendor: Siemens

Equipment: SIPROTEC 4, SIPROTEC Compact, and Reyrolle devices using the
EN100 Ethernet communication module extension

Vulnerability: Missing Authentication for Critical Function


Siemens reports that the vulnerability affects the following EN100 Ethernet
module products:

    EN100 Ethernet module IEC 61850 variant: All versions prior to V4.30,
    EN100 Ethernet module PROFINET IO variant: All versions,
    EN100 Ethernet module Modbus TCP variant: All versions,
    EN100 Ethernet module DNP3 variant: All versions, and
    EN100 Ethernet module IEC 104 variant: All versions.


Successful exploitation of this vulnerability could allow an attacker
to either upgrade or downgrade the firmware of the device, including
downgrading to older versions with known vulnerabilities.


For EN100 Ethernet module IEC 61850 variant (All versions prior to V4.30),
Siemens recommends users update to V4.30, which can be located here:


All other affected products, Siemens has identified the following specific
workarounds and mitigations that users can apply to reduce the risk. As
a general security measure Siemens strongly recommends to protect network
access with appropriate mechanisms (e.g., firewalls, segmentation, VPN). It
is advised to configure the environment according to Siemens' operational
guidelines in order to run the devices in a protected IT environment.

Recommended security guidelines to Secure Substations and Defense-in-Depth
can be found at:


For further inquiries on vulnerabilities in Siemens products and solutions,
please contact the Siemens ProductCERT:


For more information on this vulnerability and associated software updates,
please see Siemens security notification SSA-845879 on their website:


NCCIC recommends 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.

NCCIC reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.

NCCIC 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 NCCIC Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies, that is available for download from the ICS-CERT website.

Organizations observing any suspected malicious activity should follow
their established internal procedures and report their findings to NCCIC
for tracking and correlation against other incidents.

No known public exploits specifically target this vulnerability.



Successful exploitation of this vulnerability could allow an attacker
to either upgrade or downgrade the firmware of the device, including
downgrading to older versions with known vulnerabilities.

CVE-2018-4838 has been assigned to this vulnerability. A CVSS v3
base score of 7.5 has been calculated; the CVSS vector string is


Ilya Karpov and Alexey Stennikov from Positive Technologies reported this
vulnerability to Siemens.


Critical Infrastructure Sectors: Energy

Countries/Areas Deployed: Worldwide

Company Headquarters Location: Germany

Contact Information

For any questions related to this report, please contact the NCCIC at:

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 product.

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