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AUSCERT External Security Bulletin Redistribution
ESB-2022.0184
Advisory (icsa-22-013-06) Siemens SICAM PQ Analyzer
14 January 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SICAM PQ Analyzer
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-45460
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-013-06
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ICS Advisory (ICSA-22-013-06)
Siemens SICAM PQ Analyzer
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 3.4
o ATTENTION: Low attack complexity
o Vendor: Siemens
o Equipment: SICAM PQ Analyzer
o Vulnerability: Unquoted Search Path or Element
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to
achieve persistence on the system or cause a denial-of-service condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of SICAM PQ Analyzer power quality system software are
affected:
o All versions prior to v3.18
3.2 VULNERABILITY OVERVIEW
3.2.1 UNQUOTED SEARCH PATH OR ELEMENT CWE-428
A service is started by an unquoted registry entry. As there are spaces in this
path, attackers with write privilege to those directories could plant
executables that will run in place of the legitimate process. Attackers could
achieve persistence on the system ("backdoors") or cause a denial-of-service
condition.
CVE-2021-45460 has been assigned to this vulnerability. A CVSS v3 base score of
3.4 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:H/UI:N/S:U/
C:N/I:L/A:L ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Energy, Food and Agriculture,
Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
4. MITIGATIONS
Siemens has released an update for the SICAM PQ Analyzer and recommends users
update to Version 3.18 or later.
Siemens has identified the following specific workarounds and mitigations users
can apply to reduce the risk:
o Make sure these executables do not exist, cannot be created, or cannot be
executed (e.g., by Group Policy Software Restriction):
C:\Program.*
C:\Program Files.*
C:\Program Files (x86)\Siemens.*
C:\Program Files (x86)\Siemens Energy\SICAM\PQ.*
o Please note that blocking of e.g., "C:\Program.exe" is not sufficient, as
the attacker could plant "C:\Program.com", "C:\Program.msi" or an
executable with any other extension there.
Siemens recommends 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 protecting network
access with appropriate mechanisms (e.g., firewalls, segmentation, VPN). It is
advised users configure the environment according to Siemens operational
guidelines to run the devices in a protected IT environment.
For additional information, please refer to Siemens Security Advisory
SSA-173318
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. 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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