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AUSCERT External Security Bulletin Redistribution
ESB-2023.3946
ICS Advisory | ICSA-23-194-06 Honeywell Experion PKS, LX and PlantCruise
14 July 2023
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AusCERT Security Bulletin Summary
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Product: Honeywell Experion PKS, LX and PlantCruise
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-26597 CVE-2023-25948 CVE-2023-25770
CVE-2023-25178 CVE-2023-25078 CVE-2023-24480
CVE-2023-24474 CVE-2023-23585 CVE-2023-22435
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-23-194-06
Comment: CVSS (Max): 9.8 CVE-2023-25948 (CVSS:3.0/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/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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ICS Advisory (ICSA-23-194-06)
Honeywell Experion PKS, LX and PlantCruise
Release Date
July 13, 2023
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Honeywell
o Equipment: Experion PKS, LX, and PlantCruise
o Vulnerabilities: Heap-based Buffer Overflow, Stack-based Buffer Overflow,
Out-of-bounds Write, Uncontrolled Resource Consumption, Improper Encoding
or Escaping of Output, Deserialization of Untrusted Data, Improper Input
Validation, Incorrect Comparison
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could cause a
denial-of-service condition, allow privilege escalation or allow remote code
execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Honeywell reports these vulnerabilities affect the following versions of
Experion PKS, LX, and PlantCruise:
o Experion PKS: versions prior to R520.2
o Experion LX: versions prior to R520.2
o Experion PlantCruise: versions prior to R520.2
3.2 VULNERABILITY OVERVIEW
3.2.1 HEAP-BASED BUFFER OVERFLOW CWE-122
Experion Server or Console Station could experience a denial-of-service
condition due to a heap overflow during the handling of a specially crafted
message for a specific configuration operation.
CVE-2023-23585 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.2 STACK-BASED BUFFER OVERFLOW CWE-121
Experion Server or Console Station could experience a denial-of-service
condition or remote code execution due to a stack overflow during the handling
of a specially crafted message for a specific configuration operation.
CVE-2023-25078 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.3 UNEXPECTED STATUS CODE OR RETURN VALUE CWE-394
C300 could leak configuration data when an error is generated in response to a
specially crafted message.
CVE-2023-25948 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.4 UNCONTROLLED RESOURCE CONSUMPTION CWE-400
C300 could experience a denial-of-service condition due to a buffer overflow in
the handling of a specially crafted message received by the controller.
CVE-2023-26597 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 ).
3.2.5 IMPROPER ENCODING OR ESCAPING OF OUTPUT CWE-116
C300 could experience a denial-of-service condition due to a stack overflow
when decoding a message from the server.
CVE-2023-24480 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.6 DESERIALIZATION OF UNTRUSTED DATA CWE-502
C300 could experience a denial-of-service condition due to a buffer overflow
when an error is generated in response to a specially crafted message.
CVE-2023-25770 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.7 INSUFFICIENT VERIFICATION OF DATA AUTHENTICITY CWE-345
C300 may be loaded with malicious firmware which could enable remote code
execution.
CVE-2023-25178 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:H/I:N/A:N ).
3.2.8 INCORRECT COMPARISON CWE-697
Experion Server may experience a denial-of-service condition due to an
incorrect comparison when handling a specially crafted message.
CVE-2023-22435 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.2.9 HEAP-BASED BUFFER OVERFLOW CWE-122
Experion Server may experience a denial-of-service condition due to a heap
overflow which could occur when handling a specially crafted message.
CVE-2023-24474 has been assigned to this vulnerability. A CVSS v3 base score of
9.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: United States
3.4 RESEARCHER
ARMIS cyber researchers reported these vulnerabilities to Honeywell.
4. MITIGATIONS
Honeywell recommends users upgrade Experion Platforms to version R520.2.
Download information includes the following:
o Product: Experion PKS, LX, & PlantCruise
o Version: R520.2
o For instructions on this process:
? Go to the Honeywell Website and sign in.
? Select “Support” at the top of the web page.
? Select “Product Documents & Downloads.”
? In the given search box, search for: “Experion PKS R520.2”, “Experion
LX R520.2″ or “Experion PlantCruise R520.2” and select the hyperlink
for the given Experion platform.
Honeywell advises users to follow security best practices for Experion platform
environments to ensure access is limited to authorized users only. Users should
ensure the backup files are maintained in a network location or physical drive
with access limited to authorized users only and should not share them.
Honeywell Security Notifications are available on the Honeywell website. For
access, users should visit the Honeywell website and sign in, select the search
icon at the top of the web page, and search for “SN2023-06-22”.
CISA recommends users take defensive measures to minimize the risk of
exploitation of these vulnerabilities. Specifically, users should:
o Ensure the least-privilege user principle is followed.
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 these vulnerabilities. These
vulnerabilities are exploitable remotely. These vulnerabilities have a low
attack complexity.
This product is provided subject to this Notification and this Privacy & Use
policy.
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