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AUSCERT External Security Bulletin Redistribution
ESB-2023.3943
ICS Advisory | ICSA-23-194-02 Siemens SiPass Integrated
14 July 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: Siemens SiPass Integrated
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2022-31810
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-23-194-02
Comment: CVSS (Max): 7.5 CVE-2022-31810 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N/S:U/C:N/I:N/A:H
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ICS Advisory (ICSA-23-194-02)
Siemens SiPass Integrated
Release Date
July 13, 2023
1. EXECUTIVE SUMMARY
o CVSS v3 7.5
o ATTENTION: Exploitable remotely / low attack complexity
o Vendor: Siemens
o Equipment: SiPass Integrated
o Vulnerability: Improper Input Validation
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an unauthenticated
remote attacker to crash the server application, creating a denial-of-service
condition.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports this vulnerability affects the following SiPass integrated
products:
o SiPass integrated: all versions prior to V2.90.3.8
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER INPUT VALIDATION CWE-20
Affected server applications improperly check the size of data packets received
for the configuration client login, causing a stack-based buffer overflow. This
could allow an unauthenticated remote attacker to crash the server application,
creating a denial-of-service condition.
CVE-2022-31810 has been assigned to this vulnerability. A CVSS v3 base score of
7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:N/I:N/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
Siemens reported this vulnerability to CISA.
4. MITIGATIONS
Siemens has released update V2.90.3.8 for SiPass integrated and recommends
updating to the latest version.
As a general security measure Siemens strongly recommends protecting network
access to affected products with appropriate mechanisms. It is advised to
follow recommended security practices in order to run the devices in a
protected IT environment.
For further inquiries on security vulnerabilities in Siemens products and
solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert
/advisories
For more information see the associated Siemens security advisory SSA-924149 in
HTML and CSAF .
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 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.
No known public exploits specifically target this vulnerability. This
vulnerability is exploitable remotely. This vulnerability has low attack
complexity.
This product is provided subject to this Notification and this Privacy & Use
policy.
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