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             AUSCERT External Security Bulletin Redistribution

                               ESB-2020.3080
           Advisory (icsa-20-252-07) Siemens Industrial Products
                             9 September 2020

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Siemens Industrial Products
Publisher:         US-CERT
Operating System:  Network Appliance
Impact/Access:     Access Confidential Data -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2020-0543  

Reference:         ESB-2020.2057
                   ESB-2020.2004
                   ESB-2020.1994

Original Bulletin: 
   https://us-cert.cisa.gov/ics/advisories/icsa-20-252-07

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ICS Advisory (ICSA-20-252-07)

Siemens Industrial Products

Original release date: September 08, 2020

Legal Notice

All information products included in https://us-cert.gov/ics are provided"as
is" for informational purposes only. The Department of Homeland Security (DHS)
does not provide any warranties of any kind regarding any information contained
within. DHS does not endorse any commercial product or service, referenced in
this product or otherwise. Further dissemination of this product is governed by
the Traffic Light Protocol (TLP) marking in the header. For more information
about TLP, see https://www.us-cert.gov/tlp/ .



1. EXECUTIVE SUMMARY

  o CVSS v3 5.5
  o ATTENTION: Low skill level to exploit
  o Vendor: Siemens
  o Equipment: Siemens Industrial Products containing certain processors
  o Vulnerability: Exposure of Sensitive Information to an Unauthorized Actor

2. RISK EVALUATION

Successful exploitation of this vulnerability may allow an authenticated user
to enable information disclosure via local access.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

  o SIMATIC Field PG M4: All versions.
  o SIMATIC Field PG M5: All versions
  o SIMATIC Field PG M6: All versions
  o SIMATIC IPC3000 SMART: All versions
  o SIMATIC IPC347E: All versions
  o SIMATIC IPC427D (incl. SIPLUS variants): All versions
  o SIMATIC IPC427E (incl. SIPLUS variants): All versions
  o SIMATIC IPC477D: All versions
  o SIMATIC IPC477E: All versions
  o SIMATIC IPC477E Pro: All versions
  o SIMATIC IPC527G: All versions
  o SIMATIC IPC547E: All versions
  o SIMATIC IPC547G: All versions
  o SIMATIC IPC627D: All versions
  o SIMATIC IPC627E: All versions
  o SIMATIC IPC647D: All versions
  o SIMATIC IPC647E: All versions
  o SIMATIC IPC677D: All versions
  o SIMATIC IPC677E: All versions
  o SIMATIC IPC827D: All versions
  o SIMATIC IPC847D: All versions
  o SIMATIC IPC847E: All versions
  o SIMATIC ITP1000: All versions
  o SIMOTION P320-4E: All versions
  o SIMOTION P320-4S: All versions
  o SINUMERIK 828D (PPU.4 / PPU1740): All versions
  o SINUMERIK 840D sl (NCU730.3B): All versions
  o SINUMERIK ONE (NCU1750 / NCU1760): All versions

3.2 VULNERABILITY OVERVIEW

3.2.1 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED CWE-200

Incomplete cleanup from specific special register read operations in some Intel
processors may allow an authenticated user to potentially enable information
disclosure via local access.

CVE-2020-0543 has been assigned to this vulnerability. A CVSS v3 base score of
5.5 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
C:H/I:N/A:N ).

3.3 BACKGROUND

  o CRITICAL INFRASTRUCTURE SECTORS: Critical manufacturing
  o COUNTRIES/AREAS DEPLOYED: Worldwide
  o COMPANY HEADQUARTERS LOCATION: Germany

3.4 RESEARCHER

Alyssa Milburn, Hany Ragab, Kaveh Razavi, Herbert Bos, and Cristiano Giuffrida
from the VUSec group at VU Amsterdam reported this vulnerability to Intel.

4. MITIGATIONS

Siemens is preparing updates and recommends the following specific workarounds
and mitigations users can apply to reduce the risk until fixes are available.

  o As a prerequisite for an attack, an attacker must be able to run untrusted
    code on affected systems. Siemens recommends limiting the possibilities to
    run untrusted code if possible.
  o Applying a defense-in-depth concept can help to reduce the probability that
    untrusted code is run on the system. Siemens recommends applying the
    defense-in-depth concept .

As a general security measure, Siemens strongly recommends protecting network
access to devices with appropriate mechanisms. In order to operate the devices
in a protected IT environment, Siemens recommends configuring the environment
according to Siemens' operational guidelines for Industrial Security , and
following the recommendations in the product manuals.

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

For more information on these vulnerabilities and the associated mitigations,
please see Siemens security advisory SSA-534763

CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. CISA reminds organizations to perform
proper impact analysis and risk assessment prior to deploying defensive
measures.

CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.gov . 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
on the ICS webpage on us-cert.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .

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

No known public exploits specifically target this vulnerability. This
vulnerability is not exploitable from adjacent networks.

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

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

CISA 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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