Rockwell Clears MicroLogix Holes

Friday, January 6, 2017 @ 09:01 AM gHale


Rockwell Automation created new firmware versions to mitigate vulnerabilities in its Allen-Bradley MicroLogix 1100 and 1400 programmable logic controller (PLC) systems, according to a report with ICS-CERT.

These vulnerabilities, discovered by Alexey Osipov and Ilya Karpov of Positive Technologies, are remotely exploitable.

RELATED STORIES
Fidelix Fixes Path Traversal Issue
WAGO Mitigates Bypass Vulnerability
Siemens Clears Desigo Vulnerability
OmniMetrix Clears OmniView Holes

The following Allen-Bradley MicroLogix 1100 controller versions suffer from the issues:
• 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
• 1763-L16DWD, Series A and B, Version 14.000 and prior versions

The following Allen-Bradley MicroLogix 1400 controller versions suffer from the issues:
• 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
• 1766-L32AWAA, Series A and B, Version 15.004 and prior versions

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.

Rockwell Automation is a Milwaukee, WI-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. These products see action deployed across several sectors including food and agriculture, and water and wastewater systems Rockwell said these products see use on a global basis.

In one vulnerability, user credentials go 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 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.5.

In another issue, 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 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 2.7.

No known public exploits specifically target these vulnerabilities. However, an attacker with a low skill would be able to exploit these vulnerabilities.

Rockwell Automation 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 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.

Click here for the latest available firmware versions containing the mitigations.

Rockwell Automation’s security notification is available at the following URL, with a valid account.

Rockwell Automation recommends users apply firmware updates for supported products. Rockwell Automation also recommends 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.
• 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.

For more information, click on Rockwell’s security and advisories page.



Leave a Reply

You must be logged in to post a comment.