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             AUSCERT External Security Bulletin Redistribution

         Rockwell Automation Allen-Bradley CompactLogix Reflective
                    Cross-Site Scripting Vulnerability
                               3 March 2016


        AusCERT Security Bulletin Summary

Product:           Rockwell Automation Allen-Bradley CompactLogix controller
Publisher:         US-CERT
Operating System:  Network Appliance
Impact/Access:     Cross-site Scripting -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2016-2279  

Original Bulletin: 

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Advisory (ICSA-16-061-02)

Rockwell Automation Allen-Bradley CompactLogix Reflective Cross-Site Scripting

Original release date: March 01, 2016 | Last revised: March 02, 2016

Legal Notice

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contained within. DHS does not endorse any commercial product or service, 
referenced in this product or otherwise. Further dissemination of this product
is governed by the Traffic Light Protocol (TLP) marking in the header. For 
more information about TLP, see http://www.us-cert.gov/tlp/.


This advisory is a follow-up to the alert titled ICS-ALERT-15-225-01A Rockwell
Automation 1766-L32 Series Vulnerability[a] that was published August 13, 2015,
on the NCCIC/ICS-CERT web site.

Independent researcher Aditya Sood has identified a cross-site scripting 
vulnerability in Rockwell Automations CompactLogix controller. This 
vulnerability has been publicly disclosed. Rockwell Automation has produced a
new firmware version to mitigate this vulnerability.

This vulnerability could be exploited remotely.


Rockwell Automation reports that the vulnerability affects the following 
versions of the Allen-Bradley CompactLogix controller platform:

1769-L16ER-BB1B, Version 27.011 and earlier,

1769-L18ER-BB1B, Version 27.011 and earlier,

1769-L18ERM-BB1B, Version 27.011 and earlier,

1769-L24ER-QB1B, Version 27.011 and earlier,

1769-L24ER-QBFC1B, Version 27.011 and earlier,

1769-L27ERM-QBFC1B, Version 27.011 and earlier,

1769-L30ER, Version 27.011 and earlier,

1769-L30ERM, Version 27.011 and earlier,

1769-L30ER-NSE, Version 27.011 and earlier,

1769-L33ER, Version 27.011 and earlier,

1769-L33ERM, Version 27.011 and earlier,

1769-L36ERM, Version 27.011 and earlier,

1769-L23E-QB1B, Version 20.018 and earlier (Will be discontinued in June 
2016), and

1769-L23E-QBFC1B, Version 20.018 and earlier (Will be discontinued in June 


A successful exploit using this vulnerability could affect the availability of
the target device.

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.


Rockwell Automation is a US-based company that maintains offices around the 

The affected products, CompactLogix, are controllers that include a web 
server. According to Rockwell Automation, these products are deployed across 
several sectors including Chemical, Critical Manufacturing, Food and 
Agriculture, Water and Wastewater Systems, and others. Rockwell Automation 
estimates that these products are used worldwide.




The vulnerability in the CompactLogixs webserver allows an attacker to inject
arbitrary JavaScript into an unsuspecting users web browser. The target of 
this type of attack is not the CompactLogix itself. Instead, the CompactLogix
is a vehicle to deliver an attack to the web browser.

CVE-2016-2279[c] has been assigned to this vulnerability. A CVSS v3 base score 
of 6.1 has been assigned; the CVSS vector string is 



This vulnerability could be exploited remotely.


This vulnerability was publicly disclosed; it is unknown if there are public 
exploits that specifically target this vulnerability.


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


Rockwell Automation recommends that users of 1769-L23E-QB1B migrate to 
1769-L24ER-BB1B and users of 1769-L23E-QBFC1B migrate to 1769-L24ER-QBFC1B.

For the other affected versions listed above, Rockwell Automation recommends 
that users apply firmware Version 28.011+ available at:

(link is external)

For more detailed information, please see Rockwell Automations security 
notification (KB731098 ) at the following URL, with a valid account:

https://rockwellautomation.custhelp.com/app/answers/detail/a_id/731098 (link 
is external) (link is external)

Rockwell Automation also recommends the following security practices:

Use trusted software, software patches, antivirus/antimalware programs and 
interact only with trusted web sites and attachments.

Employ training and awareness programs to educate users on the warning signs 
of a phishing or social engineering attack.

Minimize network exposure for all control system devices and/or systems, and 
ensure 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 at: 
http://ics-cert.us-cert.gov/content/recommended-practices. 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. ICS-ALERT-15-225-02A - Rockwell Automation 1766-L32 Series Vulnerability, 
https://ics-cert.us-cert.gov/alerts/ICS-ALERT-15-225-02A, web site last 
accessed March 01, 2016.

b. CWE-79: Improper Neutralization of Input During Web Page Generation 
('Cross-site Scripting'), http://cwe.mitre.org/data/definitions/79.html, web 
site last accessed March 01, 2016.

c. NVD, http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-2279, NIST 
uses this advisory to create the CVE web site report. This web site will be 
active sometime after publication of this advisory.

d. CVSS Calculator, 
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S... ,
web site last accessed March 01, 2016.

Contact Information

For any questions related to this report, please contact ICS-CERT at:

Email: ics-cert@hq.dhs.gov (link sends e-mail)

Toll Free: 1-877-776-7585

International Callers: (208) 526-0900

For industrial control systems security information and incident reporting: 

ICS-CERT continuously strives to improve its products and services. You can 
help by choosing one of the links below to provide feedback about this 

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