Rockwell Automation MicroLogix 1100 PLC Overflow Vulnerability

Number: AV16-018
Date: 27 January 2016

Purpose

The purpose of this advisory is to bring attention to a stack-based buffer overflow vulnerability in Rockwell Automation Allen-Bradley MicroLogix 1100 programmable logic controller (PLC) systems.

Assessment

Rockwell Automation has released a new firmware version to address the stack-based buffer overflow vulnerability in Rockwell Automation Allen-Bradley MicroLogix 1100 PLC systems.

Affected products:
-1763-L16AWA, Series B, Version 15.000 and prior versions
-1763-L16BBB, Series B, Version 15.000 and prior versions
-1763-L16BWA, Series B, Version 15.000 and prior versions
-1763-L16DWD, Series B, Version 15.000 and prior versions
-1763-L16AWA, Series A, Version 15.000 and prior versions
-1763-L16BBB, Series A, Version 15.000 and prior versions
-1763-L16BWA, Series A, Version 15.000 and prior versions
-1763-L16DWD, Series A, Version 15.000 and prior versions

Successful exploitation of the stack-based buffer overflow vulnerability may allow an attacker to remotely execute arbitrary code on the affected device.

CVE References: CVE-2016-0868

Suggested action

CCIRC recommends that system administrators test, assess impact and deploy the vendor-released updates to affected products at your earliest convenience.

Rockwell Automation's new firmware version for the MicroLogix 1100 controller, hardware Series B, firmware Version 15.002, is available at the following URL:

http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?famID=30

Rockwell Automation's security notification is available at the following URL, with a valid account:

https://rockwellautomation.custhelp.com/app/answers/detail/a_id/765050

Rockwell Automation recommends evaluating the impact of the identified vulnerability within the host environment, and applying the following suggested mitigations, which are applicable.
-Update supported products with appropriate firmware updates.
-Disable the web server on the MicroLogix 1100, as it is enabled by default. See the knowledgebase article, KB: 732398, for detailed instructions on disabling the web server for each controller platform. The KB: 732398 is available at the following URL, with a valid account:

https://rockwellautomation.custhelp.com/app/answers/detail/a_id/732398

-Set the key switch to RUN to prohibit re-enabling of the web server via RSLogix 500.
-Rockwell Automation recommends subscribing to the Security Advisory Index (KB54102), which provides the most up-to-date information about security matters that affect Rockwell Automation products. The Knowledgebase article is available at the following URL, with a valid account:

https://rockwellautomation.custhelp.com/app/answers/detail/a_id/54102

References

ICS-CERT Advisory (ICSA-16-026-02)
https://ics-cert.us-cert.gov/advisories/ICSA-16-026-02

Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.
http://www.publicsafety.gc.ca/cnt/ntnl-scrt/cbr-scrt/_fl/CCIRCPublicPGPKey.txt

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589
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