This updated advisory is a follow-up to the original advisory titled ICSA-16-343-05 Rockwell Automation Logix5000 Programmable Automation Controller Buffer Overflow Vulnerability that was published January 5, 2017, on the NCCIC/ICS-CERT web site.
Rockwell Automation has identified a buffer overflow vulnerability in Rockwell Automation’s Logix5000 Programmable Automation Controller product line.
Rockwell Automation has produced new firmware versions to mitigate this vulnerability in the affected products. This is true with the following exceptions: 1) the FlexLogix controller, which has been discontinued and is no longer supported and 2) the PowerFlex 700S drives with Phase II control and embedded DriveLogix 5730 controller option installed.
This vulnerability could be exploited remotely.
The following firmware versions for the Logix5000 Controller product line are affected, excluding all firmware versions prior to FRN 16.00, which are not affected:
Successful exploitation of this vulnerability may allow a remote attacker to cause a denial of service at a controller or execute code on a target controller.
Impact to individual organizations depends on many factors that are unique to each organization. ICS-CERT recommends that organizations evaluate the impact of this vulnerability based on their operational environment, architecture, and product implementation.
Rockwell Automation, which is a US-based company, provides industrial automation control and information products worldwide across a wide range of industries.
The affected products in the Logix5000 Controller product line are PLCs. According to Rockwell Automation, the Logix5000 Controllers are deployed across several sectors including Critical Manufacturing, Food and Agriculture Sector, Water and Wastewater Systems, and others.
The DriveLogix 5370 controller is an optional embedded controller for the PowerFlex 700S drives with Phase II control.
Rockwell Automation estimates that these products are used worldwide.
By sending malformed common industrial protocol (CIP) packet, an attacker may be able to overflow a buffer and execute code on the controller or initiate a nonrecoverable fault resulting in a denial of service.
CVE-2016-9343b has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).c
This vulnerability could be exploited remotely.
No known public exploits specifically target this vulnerability.
An attacker with low skill would be able to exploit this vulnerability.
Rockwell Automation has released new firmware versions to mitigate the identified vulnerability in the affected Logix5000 Controllers, with the exception of the FlexLogix controller, which has been discontinued and no longer supported, and the PowerFlex 700S drives with Phase II control and embedded DriveLogix 5730 controller option installed.
Rockwell Automation has not released a new firmware version to mitigate the identified vulnerability in the DriveLogix platform, which is used with PowerFlex 700S Drives with Phase II Control. Rockwell Automation recommends that users apply the compensating controls discussed in Rockwell Automation’s security notification, Logix5000 Programmable Automation Controller Denial of Service/Buffer Overflow Vulnerability.
Rockwell Automation encourages users to install the new firmware versions, which are as follows:
Rockwell Automation’s new firmware versions are available at the following URL:
<http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx>
Rockwell Automation’s security notification is available at the following URL, with a valid account:
<https://rockwellautomation.custhelp.com/app/answers/detail/a_id/970074>
Rockwell Automation recommends that users apply additional precautions and risk mitigation strategies to this type of attack, when possible, which could include the following:
ICS-CERT recommends, as quality assurance, that users test the update in a test development environment that reflects their production environment prior to installation. In addition, users should:
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page. 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 in the ICS‑CERT Technical Information Paper, ICS-TIP-12-146-01B–Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
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