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AUSCERT External Security Bulletin Redistribution
ESB-2021.3098
Advisory (icsa-21-257-06) Siemens SIMATIC CP
15 September 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SIMATIC CP
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2021-33716
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-257-06
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ICS Advisory (ICSA-21-257-06)
Siemens SIMATIC CP
Original release date: September 14, 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 6.5
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: SIMATIC CP 1543-1 (incl. SIPLUS variants) and SIMATIC CP 1545-1
o Vulnerability: Cleartext Storage of Sensitive Information
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an attacker to read
sensitive information.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following versions of SIMATIC, a communication processor, are affected:
o SIMATIC CP 1543-1 (incl. SIPLUS variants): All versions prior to v3.0
o SIMATIC CP 1545-1: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 CLEARTEXT STORAGE OF SENSITIVE INFORMATION CWE-312
An attacker with access to the subnet of the affected device could retrieve
sensitive information stored in cleartext.
CVE-2021-33716 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been assigned; 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: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported this vulnerability to CISA.
4. MITIGATIONS
For SIMATIC CP 1543-1 (incl. SIPLUS variants), Siemens recommends affected
users update to v3.0 or later and migrate the TIA Portal engineering project to
v17. After migrating the project successfully, compilation and download to the
device is required. See this product's Siemens Product Support entry for more
information.
For SIMATIC CP 1545-1, Siemens has not identified any additional specific
workarounds or mitigations.
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as its connected devices.
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.
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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