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AUSCERT External Security Bulletin Redistribution
ESB-2017.0062
Rockwell Automation MicroLogix 1100 and 1400 Vulnerabilities
9 January 2017
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AusCERT Security Bulletin Summary
---------------------------------
Product: Rockwell Automation MicroLogix 1100 and 1400
Publisher: ICS-CERT
Operating System: Network Appliance
Impact/Access: Denial of Service -- Existing Account
Access Confidential Data -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2016-9338 CVE-2016-9334
Original Bulletin:
https://ics-cert.us-cert.gov/advisories/ICSA-16-336-06
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Advisory (ICSA-16-336-06)
Rockwell Automation MicroLogix 1100 and 1400 Vulnerabilities
Original release date: January 05, 2017
Legal Notice
All information products included in http://ics-cert.us-cert.gov are provided
"as is" for informational purposes only. The Department of Homeland Security
(DHS) does not provide any warranties of any kind regarding any information
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/.
OVERVIEW
This advisory was originally posted to the NCCIC Portal library on December
1, 2016, and is being released to the NCCIC/ICS-CERT web site.
Alexey Osipov and Ilya Karpov of Positive Technologies have identified
vulnerabilities in Rockwell Automation's Allen-Bradley MicroLogix 1100
and 1400 programmable logic controller (PLC) systems. Rockwell Automation
has produced new firmware versions to mitigate some of the vulnerabilities.
These vulnerabilities could be exploited remotely.
AFFECTED PRODUCTS
The following Allen-Bradley MicroLogix 1100 controller versions are affected:
1763-L16AWA, Series A and B, Version 14.000 and prior versions;
1763-L16BBB, Series A and B, Version 14.000 and prior versions;
1763-L16BWA, Series A and B, Version 14.000 and prior versions; and
1763-L16DWD, Series A and B, Version 14.000 and prior versions.
The following Allen-Bradley MicroLogix 1400 controller versions are affected:
1766-L32AWA, Series A and B, Version 15.004 and prior versions;
1766-L32BWA, Series A and B, Version 15.004 and prior versions;
1766-L32BWAA, Series A and B, Version 15.004 and prior versions;
1766-L32BXB, Series A and B, Version 15.004 and prior versions;
1766-L32BXBA, Series A and B, Version 15.004 and prior versions; and
1766-L32AWAA, Series A and B, Version 15.004 and prior versions.
IMPACT
Successful exploitation of these vulnerabilities may allow a remote attacker
to gain unauthorized access to affected devices, as well as impact the
availability of affected devices.
Impact to individual organizations depends on many factors that are unique
to each organization. ICS-CERT recommends that organizations evaluate the
impact of these vulnerabilities based on their operational environment,
architecture, and product implementation.
BACKGROUND
Rockwell Automation is a US-based company, which provides industrial
automation control and information products worldwide across a wide range
of industries.
The affected products, the Allen-Bradley MicroLogix 1100 and 1400, are
PLCs. According to Rockwell Automation, these products are deployed across
several sectors including Food and Agriculture, Water and Wastewater
Systems, and others. Rockwell Automation estimates that these products
are used worldwide.
VULNERABILITY CHARACTERIZATION
VULNERABILITY OVERVIEW
CLEARTEXT TRANSMISSION OF SENSITIVE INFORMATION[a]
User credentials are sent to the web server in clear text, which may allow
an attacker to discover the credentials if they are able to observe traffic
between the web browser and the server.
CVE-2016-9334[b] has been assigned to this vulnerability. A CVSS
v3 base score of 6.5 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).[c]
INCORRECT PERMISSION ASSIGNMENT FOR CRITICAL RESOURCE[d]
Users with administrator privileges may be able to remove all
administrative users requiring a factory reset to restore ancillary web
server function. Exploitation of this vulnerability will still allow the
affected device to function in its capacity as a controller.
CVE-2016-9338[e] has been assigned to this vulnerability. A CVSS
v3 base score of 2.7 has been assigned; the CVSS vector string is
(AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L).[f]
VULNERABILITY DETAILS
EXPLOITABILITY
These vulnerabilities could be exploited remotely.
EXISTENCE OF EXPLOIT
No known public exploits specifically target these vulnerabilities.
DIFFICULTY
An attacker with a low skill would be able to exploit these vulnerabilities.
MITIGATION
Rockwell Automation has released a new firmware version for the Allen-Bradley
MicroLogix 1100 Series B controller, Version 15.000, which mitigates the
incorrect permission assignment for critical resource vulnerability. Neither
of the identified vulnerabilities are mitigated in the Allen-Bradley
MicroLogix 1100 Series A controller. Rockwell Automation reports that
if applicable, users can disable the web server on the Allen-Bradley
MicroLogix 1100 controllers to protect against the exploitation of these
vulnerabilities.
Rockwell Automation has released a new firmware version for the Allen-Bradley
MicroLogix 1400 Series B controller, Version 16.000, which mitigates the
identified vulnerabilities. Neither of the identified vulnerabilities are
mitigated in the Allen-Bradley MicroLogix 1400 Series A controller. Rockwell
Automation reports that if applicable, users can disable the web server
on the Allen-Bradley MicroLogix 1400 controllers to protect against the
exploitation of these vulnerabilities.
The latest available firmware versions containing the mitigations are
available at the following URL:
http://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx
Rockwell Automation's security notification is available at the following
URL, with a valid account:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/968962
Rockwell Automation recommends that users apply firmware updates for
supported products. Rockwell Automation also recommends that the additional
precautions and risk mitigations strategies be applied, where feasible:
Disable the web server on the MicroLogix 1100 or the MicroLogix 1400,
if not needed, as it is enabled by default. See KB: 732398 for detailed
instructions on disabling the web server. The Web Server Tech Note,
KB: 732398 is available at the following URL, with a valid account:
https://rockwellautomation.custhelp.com/app/answers/detail/a_id/732398
Set the keyswitch to RUN to prohibit any re-enabling of the web server
while the keyswitch is in this mode.
Use trusted software, software patches, anti-virus / anti-malware
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.
ICS-CERT recommends, as quality assurance, that users test the update in
a test development environment that reflects their production environment
prior to installation. In addition, users should:
Minimize network exposure for all control system devices and/or systems,
and confirm 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 a 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. 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.
CWE-319: Cleartext Transmission of Sensitive Information,
https://cwe.mitre.org/data/definitions/319.html, web site last accessed
January 05, 2017.
b.
NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9334,
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
c.
CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S...,
web site last accessed January 05, 2017.
d.
CWE-732: Incorrect Permission Assignment for Critical Resource,
https://cwe.mitre.org/data/definitions/732.html, web site last accessed
January 05, 2017.
e.
NVD, https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2016-9338,
NIST uses this advisory to create the CVE web site report. This web
site will be active sometime after publication of this advisory.
f.
CVSS Calculator,
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S...,
web site last accessed January 05, 2017.
Contact Information
For any questions related to this report, please contact ICS-CERT at:
Email: ics-cert@hq.dhs.gov
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
http://ics-cert.us-cert.gov
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 product.
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