SCADA Vulnerabilities & Exposures (SVE)

CRITIFENCE® SCADA Vulnerabilities and Exposures Database (SVE)

[SVE-323282642] Rockwell Automation MicroLogix 1100 and 1400 Vulnerabilities

Date Type Platform Author EDB-ID CVE-ID OSVDB-ID Download App SIS Signature
2017-01-05PLCRockwell AutomationAlexey Osipov and Ilya KarpovN/ACVE-2016-9334 CVE-2016-9338 N/AN/AN/A

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# Rockwell Automation MicroLogix 1100 and 1400 Vulnerabilities
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### 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 INFORMATIONa
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-2016-9334b 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)

INCORRECT PERMISSION ASSIGNMENT FOR CRITICAL RESOURCEd
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-2016-9338e 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)




### 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.