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AUSCERT External Security Bulletin Redistribution
ESB-2022.1713
Advisory (icsa-22-104-06) Siemens PROFINET Stack Integrated
on Interniche Stack
20 April 2022
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens PROFINET Stack Integrated on Interniche Stack
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-25622
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-104-06
Comment: CVSS (Max): 5.3 CVE-2022-25622 (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
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ICS Advisory (ICSA-22-104-06)
Siemens PROFINET Stack Integrated on Interniche Stack
Original release date: April 14, 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 5.3
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: PROFINET Stack Integrated on Interniche Stack
o Vulnerability: Uncontrolled Resource Consumption
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow a denial-of-service
condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following products are affected:
o SIMATIC CFU DIQ (6ES7655-5PX31-1XX0): All versions
o SIMATIC CFU PA (6ES7655-5PX11-0XX0): All versions
o SIMATIC S7-300 CPU family (incl. related ET200 CPUs and SIPLUS variants):
All versions
o SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants): All versions prior
to v6.0.10
o SIMATIC S7-400 PN/DP V7 CPU family (incl. SIPLUS variants): All versions
o SIMATIC S7-410 V8 CPU family (incl. SIPLUS variants): All versions
o SIMATIC S7-410 V10 CPU family (incl. SIPLUS variants): All versions
o SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants):
All versions prior to v2.0.0
o SIMATIC TDC CP51M1: All versions
o SIMATIC TDC CPU555: All versions
o SIMATIC WinAC RTX: All versions
o SIMIT Simulation Platform: All versions
3.2 VULNERABILITY OVERVIEW
3.2.1 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
The PROFINET (PNIO) stack, when integrated with the Interniche IP stack,
improperly handles internal resources for TCP segments where the minimum
TCP-Header length is less than defined. This could allow an attacker to create
a denial-of-service condition for TCP services on affected devices by sending
specially crafted TCP segments.
CVE-2022-25622 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:L ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported this vulnerability to CISA.
4. MITIGATIONS
Siemens recommends the following workarounds and mitigations users can apply to
reduce risk:
o SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants): Update to v6.0.10
or later version.
o SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants):
Update to v2.0.0 or later version.
o Limit access to Port 102/TCP to trusted users and systems only.
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 to
follow the recommendations in the product manuals. Additional information on
industrial security by Siemens can be found at: https://www.siemens.com/
industrialsecurity
For further inquiries on security vulnerabilities in Siemens products and
solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert
/advisories
For additional information, please refer to Siemens Security Advisory
SSA-446448 - PDF Version, SSA-446448 - TXT Version, or SSA-446448 - CSAF
Version.
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 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 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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