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AUSCERT External Security Bulletin Redistribution
ESB-2023.4622
ICS Advisory | ICSA-23-222-05 Siemens RUGGEDCOM CROSSBOW
11 August 2023
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AusCERT Security Bulletin Summary
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Product: Siemens RUGGEDCOM CROSSBOW
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-37373 CVE-2023-37372 CVE-2023-27411
CVE-2022-37971 CVE-2021-31239
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-23-222-05
Comment: CVSS (Max): 9.8 CVE-2023-37372 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:N/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-23-222-05)
Siemens RUGGEDCOM CROSSBOW
Release Date
August 10, 2023
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Siemens
o Equipment: RUGGEDCOM CROSSBOW
o Vulnerabilities: Out-of-bounds Read, Improper Privilege Management, SQL
Injection, Missing Authentication for Critical Function
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
execute arbitrary database queries via SQL injection attacks, create a
denial-of-service condition, or write arbitrary files to the application's file
system.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Siemens reports that the following server application is affected:
o RUGGEDCOM CROSSBOW: Versions prior to V5.4
3.2 VULNERABILITY OVERVIEW
3.2.1 OUT-OF-BOUNDS READ CWE-125
An issue found in SQLite3 v.3.35.4 that could allow a remote attacker to cause
a denial of service via the appendvfs.c function.
CVE-2021-31239 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 ).
3.2.2 IMPROPER PRIVILEGE MANAGEMENT CWE-269
Microsoft Windows Defender has an elevation of privilege vulnerability. An
attacker who successfully exploited this vulnerability could gain specific
limited SYSTEM privileges. This vulnerability could allow an attacker to delete
data, which could include data that results in the service being unavailable.
CVE-2022-37971 has been assigned to this vulnerability. A CVSS v3 base score of
7.1 has been calculated; the CVSS vector string is ( CVSS:3.1/AV:L/AC:L/PR:L/
UI:N/S:U/C:N/I:H/A:H ).
3.2.3 SQL INJECTION CWE-89
The affected application is vulnerable to SQL injection. This could allow an
authenticated remote attacker to execute arbitrary SQL queries on the server
database and escalate privileges.
CVE-2023-27411 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:L/
UI:N/S:U/C:H/I:H/A:H ).
3.2.4 SQL INJECTION CWE-89
The affected application is vulnerable to SQL injection. This could allow an
unauthenticated remote attacker to execute arbitrary SQL queries on the server
database.
CVE-2023-37372 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( CVSS:3.1/AV:N/AC:L/PR:N/
UI:N/S:U/C:H/I:H/A:H ).
3.2.5 MISSING AUTHENTICATION FOR CRITICAL FUNCTION CWE-306
The affected application accepts unauthenticated file write messages. An
unauthenticated remote attacker could write arbitrary files to the affected
application's file system.
CVE-2023-37373 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( CVSS:3.1/AV:N/AC:H/PR:N/
UI:R/S:U/C:N/I:H/A:N ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Germany
3.4 RESEARCHER
National Cyber Security Centre (NCSC) reported these vulnerabilities to
Siemens.
4. MITIGATIONS
iemens has released an update for RUGGEDCOM CROSSBOW and recommends updating to
the latest version:
o RUGGEDCOM CROSSBOW: Update to V5.4 or later versions.
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 the
Siemens' operational guidelines for industrial security and following product
manual recommendations.
Additional information on Siemens industrial security can be found on the
Siemens industrial security webpage .
For further inquiries on security vulnerabilities in Siemens products and
solutions, please contact the Siemens ProductCERT .
For more information, see the associated Siemens security advisory SSA-472630
in HTML and CSAF .
CISA recommends users take defensive measures to minimize the risk of
exploitation of 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 exploitation specifically targeting these vulnerabilities has
been reported to CISA at this time. These vulnerabilities are exploitable
remotely. These vulnerabilities have low attack complexity.
This product is provided subject to this Notification and this Privacy & Use
policy.
Vendor
Siemens
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