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# SSA-415783: Insecure SSL configuration in SICAM A8000 CP-8000, CP-8021 and CP-8022

Publication Date:        2020-12-08
Last Update:             2020-12-08
Current Version:         1.0
CVSS v3.1 Base Score:    8.1

SUMMARY
=======

Some firmware versions of the affected products use outdated and
insecure ciphers or can be downgraded to use outdated and insecure
ciphers.


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


* SICAM A8000 CP-8000 
  - Affected versions:
       All versions < V16
  - Remediation:
       Update to V16
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109782344

* SICAM A8000 CP-8021 
  - Affected versions:
       All versions < V16
  - Remediation:
       Update to V16
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109782344

* SICAM A8000 CP-8022 
  - Affected versions:
       All versions < V16
  - Remediation:
       Update to V16
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109782344


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

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

* Configure the browser to accept only secure ciphers.
  


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
===================

The SICAM A8000 RTUs (Remote Terminal Units) series is a modular device
range for telecontrol and automation applications in all areas of energy
supply.

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-2020-28396

  A web server misconfiguration of the affected device can cause insecure
  ciphers usage by a user´s browser. An attacker in a privileged position
  could decrypt the communication and compromise confidentiality and
  integrity of the transmitted information.

  CVSS v3.1 Base Score: 8.1
  CVSS Vector:          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-693: Protection Mechanism Failure


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

Siemens thanks the following parties for their efforts:

   * Sam Hamra from KTH Royal Institute of Technology 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 (2020-12-08): Publication Date

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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