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# SSA-203306: Password Vulnerabilities in SIPROTEC 4 and SIPROTEC Compact Relay
Families

Publication Date:        2018-03-08
Last Update:             2021-07-13
Current Version:         1.5
CVSS v3.1 Base Score:    7.5

SUMMARY
=======

SIPROTEC 4 and SIPROTEC Compact devices could allow access authorization
passwords to be reconstructed or overwritten via engineering mechanisms
that involve DIGSI 4 and EN100 Ethernet communication modules.

Siemens has released updates for several affected products, and
recommends specific countermeasures for the remaining products.


AFFECTED PRODUCTS AND SOLUTION
==============================

For customers who are currently using the discontinued EN100-E or
EN100-O modules, Siemens recommends to upgrade to EN100-E+ or EN100-O+
modules in order to apply the firmware updates.


* DIGSI 4 
  - Affected versions:
       All versions < V4.92
  - Remediation:
       Update to V4.92
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109740980

* EN100 Ethernet module DNP3 variant 
  - Affected versions:
       All versions < V1.05.00
  - Remediation:
       Update to V1.05.00 and configure DIGSI 4 connection password
  - Download:
       https://support.industry.siemens.com/cs/us/en/view/109745821

* EN100 Ethernet module IEC 104 variant 
  - Affected versions:
       All versions
  - Remediation:
       See recommendations from section "Workarounds and Mitigations"

* EN100 Ethernet module IEC 61850 variant 
  - Affected versions:
       All versions < V4.30
  - Remediation:
       Update to V4.30 and configure DIGSI 4 connection password
  - Download:
       https://support.industry.siemens.com/cs/us/en/view/109745821

* EN100 Ethernet module Modbus TCP variant 
  - Affected versions:
       All versions
  - Remediation:
       See recommendations from section "Workarounds and Mitigations"

* EN100 Ethernet module PROFINET IO variant 
  - Affected versions:
       All versions
  - Remediation:
       See recommendations from section "Workarounds and Mitigations"

* Other SIPROTEC 4 relays 
  - Affected versions:
       All versions
  - Affected by vulnerabilities:
    - CVE-2018-4839
  - Remediation:
       See recommendations from section "Workarounds and Mitigations"

* Other SIPROTEC Compact relays 
  - Affected versions:
       All versions
  - Affected by vulnerabilities:
    - CVE-2018-4839
  - Remediation:
       See recommendations from section "Workarounds and Mitigations"

* SIPROTEC 4 7SD80 
  - Affected versions:
       All versions < V4.70
  - Affected by vulnerabilities:
    - CVE-2018-4839
  - Remediation:
       Update to V4.70
  - Download:
       https://support.industry.siemens.com/cs/us/en/view/109742758

* SIPROTEC 4 7SJ61 
  - Affected versions:
       All versions < V4.96
  - Affected by vulnerabilities:
    - CVE-2018-4839
  - Remediation:
       Update to V4.96
  - Download:
       https://support.industry.siemens.com/cs/us/en/view/109743551

* SIPROTEC 4 7SJ62 
  - Affected versions:
       All versions < V4.96
  - Affected by vulnerabilities:
    - CVE-2018-4839
  - Remediation:
       Update to V4.96
  - Download:
       https://support.industry.siemens.com/cs/us/en/view/109743551

* SIPROTEC 4 7SJ64 
  - Affected versions:
       All versions < V4.96
  - Affected by vulnerabilities:
    - CVE-2018-4839
  - Remediation:
       Update to V4.96
  - Download:
       https://support.industry.siemens.com/cs/us/en/view/109743551

* SIPROTEC 4 7SJ66 
  - Affected versions:
       All versions < V4.30
  - Affected by vulnerabilities:
    - CVE-2018-4839
  - Remediation:
       Update to V4.30
  - Download:
       https://support.industry.siemens.com/cs/us/en/view/109743555

* SIPROTEC Compact 7SJ80 
  - Affected versions:
       All versions < V4.77
  - Affected by vulnerabilities:
    - CVE-2018-4839
  - Remediation:
       Update to V4.77
  - Download:
       https://support.industry.siemens.com/cs/us/en/view/109742699

* SIPROTEC Compact 7SK80 
  - Affected versions:
       All versions < V4.77
  - Affected by vulnerabilities:
    - CVE-2018-4839
  - Remediation:
       Update to V4.77
  - Download:
       https://support.industry.siemens.com/cs/us/en/view/109742712


WORKAROUNDS AND MITIGATIONS
===========================

Siemens has identified the following specific workarounds and mitigations that
customers can apply to reduce the risk:

* Apply secure substation concept and Defense-in-Depth (see
https://www.siemens.com/gridsecurity) or contact customer care to find
specific solutions.



GENERAL SECURITY RECOMMENDATIONS
================================

Operators of critical power systems (e.g. TSOs or DSOs) worldwide are
usually required by regulations to build resilience into the power grids
by applying multi-level redundant secondary protection schemes. It is
therefore recommended that the operators check whether appropriate
resilient protection measures are in place. The risk of cyber incidents
impacting the grid's reliability can thus be minimized by virtue of the
grid design.

Siemens strongly recommends applying the provided security updates using
the corresponding tooling and documented procedures made available with
the product. If supported by the product, an automated means to apply
the security updates across multiple product instances may be used.
Siemens strongly recommends prior validation of any security update
before being applied, and supervision by trained staff of the update
process in the target environment.

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 our operational guidelines in order to run the devices in a protected
IT environment.

Recommended security guidelines to Digital Grid Products can be found
at:

https://www.siemens.com/gridsecurity

PRODUCT DESCRIPTION
===================

DIGSI 4 is the operation and configuration software for SIPROTEC 4 and
SIPROTEC Compact protection devices.

SIPROTEC 4 and SIPROTEC Compact devices provide a wide range of
integrated protection, control, measurement, and automation functions
for electrical substations and other fields of application.

The EN100 Ethernet modules are used for enabling process communication
on either IEC 61850, PROFINET IO, Modbus TCP, DNP3 TCP or IEC 104
protocols via electrical/optical 100 Mbit interfaces on SIPROTEC 4,
SIPROTEC Compact, Reyrolle and SWT3000 devices.

VULNERABILITY CLASSIFICATION
============================

The vulnerability classification has been performed by using the CVSS scoring
system in version 3.1 (CVSS v3.1) (https://www.first.org/cvss/). The CVSS
environmental score is specific to the customer's environment and will impact
the overall CVSS score. The environmental score should therefore be
individually defined by the customer to accomplish final scoring.

An additional classification has been performed using the CWE classification, a
community-developed list of common software security weaknesses. This serves as
a common language and as a baseline for weakness identification, mitigation,
and prevention efforts. A detailed list of CWE classes can be found at:
https://cwe.mitre.org/.



* Vulnerability CVE-2018-4839

  An attacker with local access to the engineering system or in a
  privileged network position and able to obtain certain network traffic
  could possibly reconstruct access authorization passwords.

  CVSS v3.1 Base Score: 4.0
  CVSS Vector:          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-326: Inadequate Encryption Strength

* Vulnerability CVE-2018-4840

  The device engineering mechanism allows an unauthenticated remote user
  to upload a modified device configuration overwriting access
  authorization passwords.

  CVSS v3.1 Base Score: 7.5
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-306: Missing Authentication for Critical Function


ACKNOWLEDGMENTS
===============

Siemens thanks the following parties for their efforts:

   * Ilya Karpov and Dmitry Sklyarov from Positive Technologies for coordinated disclosure



ADDITIONAL INFORMATION
======================

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

https://www.siemens.com/cert/advisories


HISTORY DATA
============

V1.0 (2018-03-08): Publication Date
V1.1 (2018-03-08): Corrected product name SIPROTEC 4 7SJ66
V1.2 (2018-04-17): Added update for DNP3 TCP
V1.3 (2018-05-15): Added update for 7SD80
V1.4 (2019-03-12): Added updates for 7SJ61, 7SJ62 and 7SJ64, and recommendation to contact
customer care for products without solution
V1.5 (2021-07-13): Corrected update version for DNP3

TERMS OF USE
============

Siemens Security Advisories are subject to the terms and conditions contained
in Siemens' underlying license terms or other applicable agreements previously
agreed to with Siemens (hereinafter "License Terms"). To the extent applicable
to information, software or documentation made available in or through a
Siemens Security Advisory, the Terms of Use of Siemens' Global Website
(https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in
particular Sections 8-10 of the Terms of Use, shall apply additionally. In case
of conflicts, the License Terms shall prevail over the Terms of Use.
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