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AUSCERT External Security Bulletin Redistribution
ESB-2021.0498
Advisory (icsa-21-040-08) Siemens SIMARIS configuration
11 February 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SIMARIS configuration
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Increased Privileges -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-28392
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-040-08
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ICS Advisory (ICSA-21-040-08)
Siemens SIMARIS configuration
Original release date: February 09, 2021
Legal Notice
All information products included in https://us-cert.cisa.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://us-cert.cisa.gov/tlp/ .
1. EXECUTIVE SUMMARY
o CVSS v3 4.4
o ATTENTION: Low skill level to exploit
o Vendor: Siemens
o Equipment: SIMARIS configuration
o Vulnerability: Incorrect Default Permissions
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to gain
persistence or escalate privileges within the system.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of SIMARIS configuration, an electrical planning
software, are affected:
o SIMARIS configuration: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 INCORRECT DEFAULT PERMISSIONS CWE-276
During installation to default target folder, incorrect permissions are
configured for the application folder and subfolders, which may allow an
attacker to gain persistence or potentially escalate privileges if a user with
elevated credentials logs onto the machine.
CVE-2020-28392 has been assigned to this vulnerability. A CVSS v3 base score of
4.4 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/
C:N/I:L/A:L ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Richard Davy from ECSC Group reported this vulnerability to Siemens.
4. MITIGATIONS
Siemens has identified the following specific workarounds and mitigations
customers can apply to reduce the risk:
o Set installation path to a folder inside %APPDATA% for your user.
o Apply the principle of least privileges operation of SIMARIS configuration
and especially do not use any administrative accounts for executing the
software.
Siemens strongly recommends protecting network access to devices with
appropriate mechanisms. To operate the devices in a protected IT environment,
Siemens recommends configuring the environment according to Siemens'
operational guidelines for Industrial Security and follow the recommendations
in the product manuals.
Additional information on industrial security by Siemens can be found at:
https://www.siemens.com/Industrialsecurity
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.cisa.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.cisa.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 remotely.
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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