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AUSCERT External Security Bulletin Redistribution
ESB-2022.6570
Advisory (icsa-22-349-02) Siemens SCALANCE X-200RNA Switch Devices
16 December 2022
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AusCERT Security Bulletin Summary
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Product: Siemens SCALANCE X-200RNA
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-46355 CVE-2022-46354 CVE-2022-46353
CVE-2022-46352 CVE-2022-46351 CVE-2022-46350
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-22-349-02
Comment: CVSS (Max): 8.8 CVE-2022-46353 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
CVSS Source: ICS-CERT
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-22-349-02)
Siemens SCALANCE X-200RNA Switch Devices
Original release date: December 15, 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 8.8
o ATTENTION: Exploitable remotely/low attack complexity/public exploits
available
o Vendor: Siemens
o Equipment: SCALANCE
o Vulnerabilities: Improper Neutralization of Script-Related HTML Tags in a
Web Page (Basic XSS), Uncontrolled Resource Consumption, Use of
Insufficiently Random Values, Improper Access Control, Exposure of
Sensitive Information to an Unauthorized Actor
2. RISK EVALUATION
Exploitation of these vulnerabilities could result in a denial-of-service
condition, hijacking of web sessions, and the loss of confidential or sensitive
information.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following Siemens software is affected:
o SCALANCE X204RNA (HSR) (6GK5204-0BA00-2MB2): All versions prior to V3.2.7
o SCALANCE X204RNA (PRP) (6GK5204-0BA00-2KB2): All versions prior to V3.2.7
o SCALANCE X204RNA EEC (HSR) (6GK5204-0BS00-2NA3): All versions prior to
V3.2.7
o SCALANCE X204RNA EEC (PRP) (6GK5204-0BS00-3LA3): All versions prior to
V3.2.7
o SCALANCE X204RNA EEC (PRP/HSR) (6GK5204-0BS00-3PA3): All versions prior to
V3.2.7
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER NEUTRALIZATION OF SCRIPT-RELATED HTML TAGS IN A WEB PAGE (BASIC
XSS) CWE-80
The integrated web server could allow cross-site scripting (XSS) attacks if
unsuspecting users are tricked into accessing a malicious link, which an
attacker could use to trigger a malicious request on the affected device.
CVE-2022-46350 has been assigned to this vulnerability. A CVSS v3 base score of
7.9 has been calculated. the CVSS vector string is ( CVSS:3.1/AV:A/AC:H/PR:N/
UI:R/S:C/C:H/I:H/A:H )
3.2.2 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
Specially crafted PROFINET DCP packets could cause a denial-of-service
condition of affected products on a local Ethernet segment (Layer 2).
CVE-2022-46351 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated. the CVSS vector string is ( CVSS:3.1/AV:A/AC:L/PR:N/
UI:N/S:U/C:N/I:N/A:H )
3.2.3 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
Specially crafted PROFINET DCP packets could cause a denial-of-service
condition of affected products.
CVE-2022-46352 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated. the CVSS vector string is ( CVSS:3.1/AV:N/AC:L/PR:N/
UI:N/S:U/C:N/I:N/A:H )
3.2.4 USE OF INSUFFICIENTLY RANDOM VALUES CWE-330
The webserver of affected devices insecurely calculates session IDs and nonces.
This could allow an unauthenticated remote attacker to brute-force session IDs
and hijack existing sessions.
CVE-2022-46353 has been assigned to this vulnerability. A CVSS v3 base score of
8.8 has been calculated. the CVSS vector string is ( CVSS:3.1/AV:N/AC:L/PR:N/
UI:R/S:U/C:H/I:H/A:H )
3.2.5 IMPROPER ACCESS CONTROL CWE-284
The webservers of affected devices are missing specific security headers. This
could allow a remote attacker to extract confidential session information under
certain circumstances.
CVE-2022-46354 has been assigned to this vulnerability. A CVSS v3 base score of
2.6 has been calculated. the CVSS vector string is ( CVSS:3.1/AV:A/AC:H/PR:N/
UI:R/S:U/C:L/I:N/A:N )
3.2.6 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200
The affected products are vulnerable to an exposure of sensitive information to
an unauthorized actor vulnerability by leaking sensitive data in the HTTP
Referer.
CVE-2022-46355 has been assigned to this vulnerability. A CVSS v3 base score of
6.5 has been calculated. the CVSS vector string is ( CVSS:3.1/AV:N/AC:L/PR:N/
UI:R/S:U/C:H/I:N/A:N )
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy,
Food and Agriculture, and Water and Wastewater Systems
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported these vulnerabilities to CISA.
4. MITIGATIONS
Siemens released updates for the affected products and recommends updating to
the latest versions:
o Update to V3.2.7 or later version
Siemens identified the following specific workarounds and mitigations users can
apply to reduce risk:
o Restrict access to affected systems, especially to ports 22/TCP, 80/TCP,
443/TCP, and 161/UDP to only trusted IP addresses.
o Disable the simple network management protocol (SNMP) service if not
required and if the product supports disabling.
o Deactivate the webserver if not required and if the product supports
deactivation.
As a general security measure, Siemens 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 following the
recommendations in the product manuals.
Additional information on industrial security by Siemens can be found on the
Siemens Industrial Security webpage .
For further inquiries on security vulnerabilities in Siemens products, users
should contact Siemens ProductCERT .
For more information, see the associated Siemens security advisory SSA-363821
in HTML and CSAF .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability these vulnerabilities. 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 business networks.
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 at cisa.gov/ics . Several CISA products detailing cyber
defense best 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 at cisa.gov/ics in the technical information paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing suspected malicious activity should follow established
internal procedures and report findings to CISA for tracking and correlation
against other incidents.
CISA also recommends users take the following measures to protect themselves
from social engineering attacks:
o Do not click web links or open attachments in unsolicited email messages.
o Refer to Recognizing and Avoiding Email Scams for more information on
avoiding email scams.
o Refer to Avoiding Social Engineering and Phishing Attacks for more
information on social engineering attacks.
No known public exploits specifically target these vulnerabilities. These
vulnerabilities are exploitable remotely. These vulnerabilities have a low
attack complexity.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
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