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AUSCERT External Security Bulletin Redistribution
ESB-2021.2050
Advisory (icsa-21-159-06) Thales Sentinel LDK Run-Time Environment
9 June 2021
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AusCERT Security Bulletin Summary
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Product: Thales Sentinel LDK Run-Time Environment
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2021-32928
Original Bulletin:
https://us-cert.cisa.gov/ics/advisories/icsa-21-159-06
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ICS Advisory (ICSA-21-159-06)
Thales Sentinel LDK Run-Time Environment
Original release date: June 08, 2021
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 9.6
o ATTENTION: Exploitable remotely/low attack complexity
o Vendor: Thales
o Equipment: Thales Sentinel LDK Run-Time Environment (RTE)
o Vulnerability: Incomplete Cleanup
2. RISK EVALUATION
Products that have uninstalled software using the Sentinel LDK Run-Time
Environment, may have a port left open that may allow an attacker to connect.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Machines that previously ran and then uninstalled the following versions of
Sentinel LDK Run Time Environment are affected:
o Sentinel LDK Run-Time Environment: Versions 7.6 and prior
This RTE is used in products by many different vendors. As new instances are
discovered/reported, they will be added to this list of affected products.
3.2 VULNERABILITY OVERVIEW
3.2.1 INCOMPLETE CLEANUP CWE-459
The run-time environment installer adds a firewall rule named "Sentinel License
Manager" that allows incoming connections from private networks using TCP Port
1947. While uninstalling, the uninstaller fails to close Port 1947.
CVE-2021-32928 has been assigned to this vulnerability. A CVSS v3 base score of
9.6 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:R/S:C/
C:H/I:H/A:H ).
3.3 BACKGROUND
o CRITICAL INFRASTRUCTURE SECTORS: Multiple
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: France
3.4 RESEARCHER
This vulnerability was submitted to CISA anonymously.
4. MITIGATIONS
Thales recommends vendors and users to upgrade to RTE Version 8.15 or later .
If uninstalling with affected version, ensure "purge option" is selected. The
purge option removes the Sentinel License Manager and closes the port.
If the affected product has been uninstalled:
o Ensure TCP Port 1947 is closed.
o If possible, implement appropriate IDS/IPS measures against TCP Port 1947
For more information on products dependent on the affected RTE see the
following vendor security advisories or updates:
o Halliburton GOHFER: Update to Version 9.1.3.57 thru 9.2.x.xx and when
uninstalling select the purge option. Upon uninstalling, the purge option
removes the Sentinel License Manager and closes the port. Subsequent
versions of GOHFER will no longer use Sentinel LDK.
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 that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
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 on us-cert.cisa.gov . Several recommended 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 on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies .
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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