Rockwell Fixes PAC Buffer Overflow

Friday, January 6, 2017 @ 10:01 AM gHale


Rockwell Automation updated its mitigation of a buffer overflow vulnerability in its Logix5000 Programmable Automation Controller product line, according to a report with ICS-CERT.

The fix, though, has some exceptions: The FlexLogix controller, which has been discontinued and is no longer supported and the PowerFlex 700S drives with Phase II control and embedded DriveLogix 5730 controller option installed.

This vulnerability, which Rockwell discovered, is remotely exploitable.

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The following firmware versions for the Logix5000 Controller product line suffer from the issue, excluding all firmware versions prior to FRN 16.00, which do not have the problem:

FRN 16.00
• PowerFlex 700S drives with Phase II control and the embedded DriveLogix 5730 controller option installed (V16.020 through V16.022,
• 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)
• 1768 CompactLogix L4x controllers, (V16.020 through V16.025)

FRN 17.00
• PowerFlex 700S drives with Phase II control and the embedded DriveLogix 5730 controller option installed (V17.003 and V17.004)
• 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)
• 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)
• 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)
• 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)
• 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)
• 1769 CompactLogix 5370 L3 controllers (all versions)

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.

Rockwell Automation, which is a Milwaukee, WI-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. Logix5000 Controllers see action across several sectors including critical manufacturing, food and agriculture sector, and water and wastewater systems. Rockwell said these products see use on a global basis.

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

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-2016-9343 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 10.0.

No known public exploits specifically target this vulnerability. However, an attacker with low skill would be able to exploit this vulnerability.

Rockwell Automation released new firmware versions to mitigate the identified vulnerability in the affected Logix5000 Controllers, with the exception of the FlexLogix controller, which the company discontinued and no longer supports, and the PowerFlex 700S drives with Phase II control and embedded DriveLogix 5730 controller option installed.

Rockwell has not released a new firmware version to mitigate the identified vulnerability in the DriveLogix platform, which sees use with PowerFlex 700S Drives with Phase II Control. Rockwell recommends users apply the compensating controls discussed in Rockwell Automation’s security notification, Logix5000 Programmable Automation Controller Denial of Service/Buffer Overflow Vulnerability.

Rockwell 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
• ControlLogix 5570, FRN 24 (Catalog Number: 1756-L7S), the product fix is incorporated into FRN 24 and above

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

Click here for Rockwell’s security notification.

Rockwell recommends 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.

For more information, click on Rockwell’s security and advisories page.



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