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AUSCERT External Security Bulletin Redistribution
ESB-2022.0182
Advisory (icsa-22-013-04) Siemens SIPROTEC 5 Devices
14 January 2022
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AusCERT Security Bulletin Summary
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Product: Siemens SIPROTEC 5 Devices
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-41769
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-013-04
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ICS Advisory (ICSA-22-013-04)
Siemens SIPROTEC 5 Devices
Original release date: January 13, 2022
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 6.5
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: SIPROTEC 5 products
o Vulnerability : Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an unauthenticated
attacker to read device information.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports this vulnerability affects the following SIPROTEC 5 products:
o Devices with the hardware variants CP050, CP100, and CP300
o A full list of the affected devices was published in the Siemens Security
Advisory SSA-439673
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
An improper input validation vulnerability in the web server could allow an
unauthenticated user to access device information.
CVE-2021-41769 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/
C:H/I:N/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Energy
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported this vulnerability to CISA.
4. MITIGATIONS
Siemens recommends updating to v8.83 or later versions
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, and supervision by trained
staff of the update process in the target environment.
As a general security measure Siemens strongly recommends protecting network
access with appropriate mechanisms (e.g., firewalls, segmentation, VPN).
Siemens also encourages users to configure the environment according to Siemens
operational guidelines for industrial security in order to run the devices in a
protected IT environment.
Siemens also recommends following security guidelines for Digital Grid Products
.
For additional information, please refer to Siemens Security Advisory
SSA-439673
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 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 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.
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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