PT-2017-01: Information Disclosure in Rockwell Automation Micrologix 1100 and 1400 PLC

(PT-2017-01) Positive Technologies Security Advisory
Information Disclosure in Rockwell Automation Micrologix 1100 and 1400 PLC

Vulnerable product

Micrologix 1100
Version: 1763-L16AWA, 1763-L16BBB, 763-L16BWA, 1763-L16DWD series A and B before 15.000

Micrologix 1400
Version: 1766-L32AWA, 1766-L32BWA, 1766-L32BWAA, 1766-L32BXB, 1766-L32BXBA, 1766-L32AWAA series A and B before 16.000


Severity level

Severity level: Medium
Impact: Information Disclosure
Access Vector: Remote

CVSS v3:
Base Score: 6.5
Vector: (AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)

CVE: CVE-2016-9334

Software description

Rockwell Automation Micrologix 1100 and 1400 are programmable logic controllers.

Vulnerability description

The specialists of the Positive Research center have detected an Information Disclosure vulnerability in Rockwell Automation Micrologix 1100 and 1400 PLC.

Vulnerability in Allen-Bradly MicroLogix 1100 and 1400 allows remote attackers to obtain user credentials in clear text by sniffing browser-to-server traffic.

How to fix

Update the firmware of your device to the latest version

Advisory status

11.06.2015 - Vendor gets vulnerability details
05.01.2017 - Vendor releases fixed version and details
11.01.2017 - Public disclosure


The vulnerability was detected by Alexey Osipov, Ilya Karpov, Positive Research Center (Positive Technologies Company)


Reports on the vulnerabilities previously discovered by Positive Research:

About Positive Technologies

Positive Technologies is a leading provider of vulnerability assessment, compliance management and threat analysis solutions to more than 1,000 global enterprise clients. Our solutions work seamlessly across your entire business: securing applications in development; assessing your network and application vulnerabilities; assuring compliance with regulatory requirements; and blocking real-time attacks. Our commitment to clients and research has earned Positive Technologies a reputation as one of the foremost authorities on SCADA, Banking, Telecom, Web Application and ERP security, and distinction as the #1 fastest growing Security and Vulnerability Management firm in 2012, as shown in an IDC report*. To learn more about Positive Technologies please visit

*Source: IDC Worldwide Security and Vulnerability Management 2013-2017 Forecast and 2012 Vendor Shares, doc #242465, August 2013. Based on year-over-year revenue growth in 2012 for vendors with revenues of $20M+