Rockwell Automation MicroLogix 1100 PLC Overflow Vulnerability
Date: 27 January 2016
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.
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.
-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
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:
Rockwell Automation's security notification is available at the following URL, with a valid account:
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:
-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:
ICS-CERT Advisory (ICSA-16-026-02)
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