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# SSA-646841: Recoverable Password from Configuration Storage in SCALANCE X Switches

Publication Date:        2019-06-11
Last Update:             2021-02-09
Current Version:         1.2
CVSS v3.1 Base Score:    7.1

SUMMARY
=======

A vulnerability exists in several SCALANCE X switches that could allow
external entities to reconstruct passwords for users of the affected
devices if an attacker is able to obtain a backup of the device
configuration.

Siemens has released updates for several affected products and
recommends to update to the latest versions. Siemens recommends specific
countermeasures for products where updates are not, or not yet
available.


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


* SCALANCE X-200 switch family (incl. SIPLUS NET variants) 
  - Affected versions:
       All Versions < V5.2.4
  - Remediation:
       Update to V5.2.4 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109767965

* SCALANCE X-200IRT switch family (incl. SIPLUS NET variants) 
  - Affected versions:
       All versions < V5.5.0
  - Remediation:
       Update to V5.5.0 or later version
  - Download:
       https://support.industry.siemens.com/cs/ww/en/view/109792534/

* SCALANCE X-300 switch family (incl. X408 and SIPLUS NET variants) 
  - Affected versions:
       All versions < V4.1.3
  - Remediation:
       Update to V4.1.3 or later version
  - Download:
       https://support.industry.siemens.com/cs/document/109773547

* SCALANCE X-414-3E 
  - Affected versions:
       All versions
  - Remediation:
        See recommendations from section Workarounds and Mitigations


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

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

* Restrict access to config backups or archived device configuration files
  
* Restrict or disable network access to mechanisms that allow to retrieve
the device configuration, if enabled.
  
* Restrict access to device configuration module C-PLUG, if in use.
  
* SCALANCE X-414-3E: Migrate to SCALANCE XM-400 product line
  


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

As a general security measure, Siemens strongly recommends to protect
network access to devices with appropriate mechanisms. In order to
operate the devices in a protected IT environment, Siemens recommends to
configure the environment according to Siemens' operational guidelines
for Industrial Security (Download:
https://www.siemens.com/cert/operational-guidelines-industrial-security),
and to follow the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found
at: https://www.siemens.com/industrialsecurity

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

SCALANCE X switches are used to connect industrial components like
Programmable Logic Controllers (PLCs) or Human Machine Interfaces
(HMIs).

SIPLUS extreme products are designed for reliable operation under
extreme conditions and are based on SIMATIC, LOGO!, SITOP, SINAMICS,
SIMOTION, SCALANCE or other devices. SIPLUS devices use the same
firmware as the product they are based on.

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-2019-6567

  The affected devices store passwords in a recoverable format. An
  attacker may extract and recover device passwords from the device
  configuration.
  
  Successful exploitation requires access to a device configuration backup
  and impacts confidentiality of the stored passwords.

  CVSS v3.1 Base Score: 7.1
  CVSS Vector:          CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N/E:P/RL:O/RC:C
  CWE:                  CWE-257: Storing Passwords in a Recoverable Format


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

Siemens thanks the following parties for their efforts:

   * Christopher Wade from Pen Test Partners for coordinated disclosure
   * Artem Zinenko from Kaspersky for pointing out that SIPLUS should also be mentioned



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 (2019-06-11): Publication Date
V1.1 (2020-01-14): SIPLUS devices now explicitly mentioned in the list of affected
products; added update information for SCALANCE X-300/X408
V1.2 (2021-02-09): Added solution for SCALANCE X-200IRT switch family

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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