ICS Advisory (ICSA-21-119-03)

Johnson Controls Exacq Technologies exacqVision

Click to Tweet.
Click to send to Facebook.
Click to Share.

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

  • CVSS v3 7.0
  • Vendor: Exacq Technologies, Inc., a subsidiary of Johnson Controls, Inc.
  • Equipment: exacqVision
  • Vulnerability: Off-by-one Error

2. RISK EVALUATION

A local attacker could exploit this vulnerability to obtain “Super User” access to the underlying Ubuntu Linux operating system.

3. TECHNICAL DETAILS

3.1 AFFECTED PRODUCTS

Johnson Controls reports the vulnerability affects the following products running on unpatched versions of the Ubuntu operating system:

  • Linux based Z-Series and A-Series
  • Q-Series
  • G-Series
  • Legacy LC-Series
  • Legacy ELP-Series
  • exacqVision Network Video Recorders (NVR)
  • Linux based C-Series Workstations
  • S-Series Storage Servers

3.2 VULNERABILITY OVERVIEW

3.2.1    OFF-BY-ONE ERROR CWE-193

The affected product calculates or uses an incorrect maximum or minimum value that is one more or one less than the correct value.

CVE-2021-3156 has been assigned to this vulnerability. A CVSS v3 base score of 7.0 has been calculated; the CVSS vector string is (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

3.3 BACKGROUND

  • CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
  • COUNTRIES/AREAS DEPLOYED: Worldwide
  • COMPANY HEADQUARTERS LOCATION: Ireland

3.4 RESEARCHER

Johnson Controls reported this vulnerability to CISA.

4. MITIGATIONS

Johnson Controls recommends users install the latest security updates for the Ubuntu Linux operating system.

Users may contact Exacq technical support for assistance with updating their operating system.

For more detailed mitigation instructions, please see Johnson Controls Product Security Advisory JCI-PSA-2021-04

CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:

  • Ensure the least-privilege user principle is followed.

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. This vulnerability is not exploitable remotely. High attack complexity.


Contact Information

For any questions related to this report, please contact the CISA at:

Email: CISAservicedesk@cisa.dhs.gov
Toll Free: 1-888-282-0870

For industrial control systems cybersecurity information:  https://us-cert.cisa.gov/ics 
or incident reporting:  https://us-cert.cisa.gov/report

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.

This product is provided subject to this Notification and this Privacy & Use policy.

Please share your thoughts.

We recently updated our anonymous product survey; we'd welcome your feedback.