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AUSCERT External Security Bulletin Redistribution
ESB-2023.1203
ICS Advisory | ICSA-23-054-01 PTC ThingWorx Edge
28 February 2023
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AusCERT Security Bulletin Summary
---------------------------------
Product: PTC ThingWorx Edge
Publisher: ICS-CERT
Operating System: Network Appliance
Resolution: Patch/Upgrade
CVE Names: CVE-2023-0755 CVE-2023-0754
Original Bulletin:
https://www.cisa.gov/news-events/ics-advisories/icsa-23-054-01
Comment: CVSS (Max): 9.8 CVE-2023-0755 (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-23-054-01)
PTC ThingWorx Edge
Release Date
February 23, 2023
1. EXECUTIVE SUMMARY
o CVSS v3 9.8
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: PTC
o Equipment: ThingWorx Edge
o Vulnerabilities: Improper Validation of Array Index, Integer Overflow or
Wraparound
2. RISK EVALUATION
Successful exploitation of these vulnerabilities could allow an attacker to
crash the device or could allow remote code execution.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
The following components of PTC ThingWorx are affected:
o ThingWorx Edge C-SDK: v2.2.12.1052 or lower
o .NET-SDK: v5.8.4.971 or lower
o ThingWorx Edge MicroServer (EMS): v5.4.10.0 or lower
o Kepware KEPServerEX: v6.12 or lower
o ThingWorx Kepware Server (formerly ThingWorx Industrial Connectivity):
v6.12 or lower
o ThingWorx Industrial Connectivity: All versions
o ThingWorx Kepware Edge: v1.5 or lower
o Rockwell Automation KEPServer Enterprise: v6.12 or lower
o GE Digital Industrial Gateway Server: v7.612 or lower
3.2 VULNERABILITY OVERVIEW
3.2.1 IMPROPER VALIDATION OF ARRAY INDEX CWE-129
The affected products are vulnerable to an improper validation of array index,
which could allow an attacker to crash the server and remotely execute
arbitrary code.
CVE-2023-0755 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 INTEGER OVERFLOW OR WRAPAROUND CWE-190
The affected products are vulnerable to an integer overflow or wraparound,
which could allow an attacker to crash the server and remotely execute
arbitrary code.
CVE-2023-0754 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
Chris Anastasio and Steven Seeley of Incite Team reported these vulnerabilities
to CISA.
4. MITIGATIONS
PTC released the following resolutions:
Update the impacted product to the latest version:
o ThingWorx Edge C-SDK: 3.0.0 or later.
o ThingWorx Edge MicroServer (EMS): v5.4.11 or later.
o .NET-SDK: v5.8.5 or later.
The vulnerability is mitigated for Kepware products if the ThingWorx Interface
is not enabled. To use the ThingWorx Interface without the vulnerability,
update to the latest version of the product:
o Kepware KEPServerEX: v6.13 or later.
o ThingWorx Kepware Server (formerly ThingWorx Industrial Connectivity):
v6.13 or later.
o ThingWorx Kepware Edge: v1.6 or later.
The following products should be upgraded as indicated or in accordance with
the applicable organization's recommendations if the ThingWorx Interface is in
use:
o Rockwell Automation KEPServer Enterprise: v6.13 or later.
o GE Digital Industrial Gateway Server: v7.613 or later.
o For more information, see PTC's Customer Support Article (login required).
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.
No known public exploits specifically target these vulnerabilities.
Please share your thoughts.
We recently updated our anonymous Product Feedback ; we'd welcome your
feedback.
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