Rockwell Automation Logix5000 Programmable Automation Controller Buffer Overflow Vulnerability (Update A)

OVERVIEW

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.

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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.

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This vulnerability could be exploited remotely.

AFFECTED PRODUCTS

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:

• FRN 16.00

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• PowerFlex 700S drives with Phase II control and the embedded DriveLogix 5730 controller option installed (V16.020 through V16.022),

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• ControlLogix 5560 controllers (V16.020 through V16.022),
• ControlLogix L55 controllers (V16.020 through V16.022),
• ControlLogix 5560 Redundant controllers (all versions ),
• GuardLogix 5560 controllers (all versions),
• FlexLogix L34 controllers (all versions),
• 1769 CompactLogix L23x controllers (all versions),
• 1769 CompactLogix L3x controllers (V16.020 through V16.023), and
• 1768 CompactLogix L4x controllers, (V16.020 through V16.025).
• FRN 17.00

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• PowerFlex 700S drives with Phase II control and the embedded DriveLogix 5730 controller option installed (V17.003 and V17.004),

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• SoftLogix 5800 controllers (all versions),
• ControlLogix 5560 controllers (all versions),
• GuardLogix 5560 controllers (all versions),
• 1769 CompactLogix L23x controllers (all versions),
• 1769 CompactLogix L3x controllers (all versions), and
• 1768 CompactLogix L4x controllers (all versions).
• FRN 18.00
• SoftLogix 5800 controllers (all versions),
• RSLogix Emulate 5000 (all versions),
• ControlLogix 5560 controllers (all versions),
• ControlLogix 5570 controllers (all versions),
• GuardLogix 5560 controllers (all versions),
• 1769 CompactLogix L23x controllers (all versions),
• 1769 CompactLogix L3x controllers (all versions),
• 1768 CompactLogix L4x controllers (all versions) , and
• 1768 Compact GuardLogix L4xS (all versions).
• FRN 19.00
• SoftLogix 5800 controllers (all versions),
• RSLogix Emulate 5000 (all versions),
• ControlLogix 5560 controllers (all versions),
• ControlLogix 5570 controllers (all versions),
• ControlLogix 5560 Redundant controllers (all versions),
• GuardLogix 5560 controllers (all versions),
• 1769 CompactLogix L23x controllers (all versions),
• 1769 CompactLogix L3x controllers (all versions),
• 1768 CompactLogix L4x controllers (all versions), and
• 1768 Compact GuardLogix L4xS controllers (all versions).
• FRN 20.00
• SoftLogix 5800 controllers (all versions),
• RSLogix Emulate 5000 (all versions),
• ControlLogix 5560 controllers (V20.010 through V20.013),
• ControlLogix 5570 controllers (V20.010 through V20.013),
• ControlLogix 5560 Redundant controllers (V20.050 through V20.055),
• ControlLogix 5570 Redundant controllers (V20.050 through V20.055),
• GuardLogix 5560 controllers (V20.010 through V20.017),
• GuardLogix 5570 controllers (V20.010 through V20.017),
• 1769 CompactLogix L23x controllers (V20.010 through V20.013),
• 1769 CompactLogix L3x controllers (V20.010 through V20.013),
• 1769 CompactLogix 5370 L1 controllers (V20.010 through V20.013),
• 1769 CompactLogix 5370 L2 controllers (V20.010 through V20.013),
• 1769 CompactLogix 5370 L3 controllers (V20.010 through V20.013),
• 1768 CompactLogix L4x controllers (V20.011 through V20.016), and
• 1768 Compact GuardLogix L4xS controllers (V20.011 through V20.013).
• FRN 21.00
• SoftLogix 5800 controllers (all versions),
• RSLogix Emulate 5000 (all versions),
• ControlLogix 5570 controllers (all versions),
• ControlLogix 5570 Redundant controllers (all versions),
• GuardLogix 5570 controllers (all versions),
• 1769 CompactLogix 5370 L1 controllers (all versions),
• 1769 CompactLogix 5370 L2 controllers (all versions), and
• 1769 CompactLogix 5370 L3 controllers (all versions).

IMPACT

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.

BACKGROUND

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.

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The DriveLogix 5370 controller is an optional embedded controller for the PowerFlex 700S drives with Phase II control.

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Rockwell Automation estimates that these products are used worldwide.

VULNERABILITY CHARACTERIZATION

VULNERABILITY OVERVIEW

STACK-BASED BUFFER OVERFLOWa

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

VULNERABILITY DETAILS

EXPLOITABILITY

This vulnerability could be exploited remotely.

EXISTENCE OF EXPLOIT

No known public exploits specifically target this vulnerability.

DIFFICULTY

An attacker with low skill would be able to exploit this vulnerability.

MITIGATION

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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.

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Rockwell Automation encourages users to install the new firmware versions, which are as follows:

• SoftLogix 5800, FRN 23 (Catalog Number: 1789-Lx), the product fix is incorporated into FRN 23.00 and above;
• RSLogix Emulate 5000, FRN 23 (Catalog Number: 9310-Wx), the product fix is incorporated into FRN 23.00 and above;
• ControlLogix L55, FRN 16 (Catalog Number: 1756-L55x), the product fix is incorporated into FRN 16.023 and above;
• ControlLogix 5560, FRN 16 (Catalog Number: 1756-L6), the product fix is incorporated into FRN 16.023 and above;
• ControlLogix 5560, FRN 20 (Catalog Number: 1756-L6), the product fix is incorporated into FRN 20.014 and above;
• ControlLogix 5570, FRN 20 (Catalog Number: 1756-L7), the product fix is incorporated into FRN 20.014 and above;
• ControlLogix 5570, FRN 23 (Catalog Number: 1756-L7), the product fix is incorporated into FRN 23.012 and above;
• ControlLogix 5570, FRN 24 (Catalog Number: 1756-L7), the product fix is incorporated into FRN 24 and above;
• ControlLogix 5560 Redundant, FRN 20 (Catalog Number: 1756-L6), the product fix is incorporated into FRN 20.056 and above;
• ControlLogix 5570 Redundant, FRN 20 (Catalog Number: 1756-L7), the product fix is incorporated into FRN 20.056 and above;
• ControlLogix 5570 Redundant, FRN 24 (Catalog Number: 1756-L7), the product fix is incorporated into FRN 24.052 and above;
• ControlLogix L23x and L3x, FRN 20 (Catalog Number: 1769-L23, 1769-L31, 1769-L32, 1769-L35), the product fix is incorporated into FRN 20.014 and above;
• 1769 CompactLogix 5370 L1, L2, and L3 Controllers, FRN 20 (Catalog Numbers: 1769-L1, 1769-L2, and 1769-L3), the product fix is incorporated into FRN 20.014 and above;
• 1769 CompactLogix 5370 L1, L2, and L3 Controllers, FRN 23 (Catalog Numbers: 1769-L1, 1769-L2, and 1769-L3), the product fix is incorporated into FRN 23.012 and above;
• 1769 CompactLogix 5370 L1, L2, and L3 Controllers, FRN 24 (Catalog Numbers: 1769-L1, 1769-L2, and 1769-L3), the product fix is incorporated into FRN 24 and above;
• CompactLogix L4 Controllers, FRN 16 (Catalog Number: 1768-L4x), the product fix is incorporated into FRN 16.026 (Series A, B, and C) and FRN 16.027 and above (Series D);
• CompactLogix L4 Controllers, FRN 20 (Catalog Number: 1768-L4x), the product fix is incorporated into FRN 20.014 and above (Series A, B, and C) and FRN 20.016 and above (Series D);
• Compact GuardLogix L4xS Controllers, FRN 20 (Catalog Number: 1768-L4xS), the product fix is incorporated into FRN 20.018 and above.
• GuardLogix 5560, FRN 20 (Catalog Number: 1756-L6S), the product fix is incorporated into FRN 20.018 and above;
• ControlLogix 5570, FRN 20 (Catalog Number: 1756-L7S), the product fix is incorporated into FRN 20.018 and above;
• ControlLogix 5570, FRN 23 (Catalog Number: 1756-L7S), the product fix is incorporated into FRN 23.012 and above; and
• ControlLogix 5570, FRN 24 (Catalog Number: 1756-L7S), the product fix is incorporated into FRN 24 and above.

Rockwell Automation’s new firmware versions are available at the following URL:

<http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx&gt;

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&gt;

Rockwell Automation recommends that users apply additional precautions and risk mitigation strategies to this type of attack, when possible, which could include the following:

• Use proper network infrastructure controls, such as firewalls, to help confirm that requests from unauthorized sources are blocked.
• Block all traffic to affected devices from outside the Manufacturing Zone by blocking or restricting access to Port 2222 TCP/UDP and Port 44818 TCP/UDP, using network infrastructure controls, such as firewalls, or other security appliances.
• When possible, keep the controller in RUN mode rather than Remote RUN or Remote Program in order to prevent other disruptive changes to the system.

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:

• Minimize network exposure for all control system devices and/or systems, and help confirm that they are not accessible from the Internet.
• Locate control system networks and devices behind firewalls, and isolate them from the business network.
• When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing that VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize that VPN is only as secure as the connected devices.

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.

• a. CWE-121: Stack-based Buffer Overflow, <https://cwe.mitre.org/data/definitions/121.html&gt;, web site last accessed January 05, 2017.
• b. NVD, <https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9343&gt;, NIST uses this advisory to create the CVE web site report. This web site will be active sometime after publication of this advisory.
• c. CVSS Calculator, https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S…, web site last accessed January 05, 2017.