Rockwell Automation ControlLogix PLC Improper Authentication

Primary CVSS: v2.0 10 from [email protected]

AV:N/AC:L/Au:N/C:C/I:C/A:C

Problem Types: CWE-287 | CWE-287 CWE-287

Discovery Credit

CNA: Rubén Santamarta of IOActive identified vulnerabilities in Rockwell Automation’s ControlLogix PLC and released proof-of-concept (exploit) code at the Digital Bond S4 Conference on January 19, 2012. (en)

Solutions

CNA: According to Rockwell, any of the above products that become affected by a vulnerability can be reset by rebooting or power cycling the affected product. After the reboot, the affected product may require some reconfiguration. To mitigate the vulnerabilities, Rockwell has developed and released security patches on July 18, 2012, to address each of the issues. To download and install the patches please refer to Rockwell’s Advisories at: https://rockwellautomation.custhelp.com/app/answers/detail/a_id/470154 https://rockwellautomation.custhelp.com/app/answers/detail/aid/470155 https://rockwellautomation.custhelp.com/app/answers/detail/aid/470156 For more information on security with Rockwell Automation products, please refer to Rockwell’s Security Advisory Index http://rockwellautomation.custhelp.com/app/answers/detail/a_id/54102 .

Workarounds

CNA: Rockwell recommends updating to the newest firmware patches to fix the vulnerabilities, but if not able to do so right away, then Rockwell advises immediately employing the following mitigations for each of the affected products. To mitigate the vulnerability with the Web server password authentication mechanism: * Upgrade the MicroLogix 1400 firmware to FRN 12 or higher. * Because of limitations in the MicroLogix 1100 platform, none of the firmware updates will be able to fix this issue, so users should use the following techniques to help reduce the likelihood of compromise. * Where possible, disable the Web server and change all default Administrator and Guest passwords. * If Web server functionality is needed, then Rockwell recommends upgrading the product’s firmware to the most current version to have the newest enhanced protections available such as: * When a controller receives two consecutive invalid authentication requests from an HTTP client, the controller resets the Authentication Counter after 60 minutes. * When a controller receives 10 invalid authentication requests from any HTTP client, it will not accept any valid or invalid authentication packets until a 24-hour HTTP Server Lock Timer timeout. * If Web server functionality is needed, Rockwell also recommends configuring user accounts to have READ only access to the product so those accounts cannot be used to make configuration change In addition to the above, Rockwell recommends concerned customers remain vigilant and continue to follow security strategies that help reduce risk and enhance overall control system security. Where possible, they suggest you apply multiple recommendations and complement this list with your own best-practices: * Employ layered security and defense-in-depth methods in system design to restrict and control access to individual products and control networks. Refer to http://www.ab.com/networks/architectures.html for comprehensive information about implementing validated architectures designed to deliver these measures. * Restrict physical and electronic access to automation products, networks, and systems to only those individuals authorized to be in contact with control system equipment. * Employ firewalls with ingress/egress filtering, intrusion detection/prevention systems, and validate all configurations. Evaluate firewall configurations to ensure other appropriate inbound and outbound traffic is blocked. * Use up-to-date end-point protection software (e.g., antivirus/antimalware software) on all PC-based assets. * Make sure that software and control system device firmware is patched to current releases. * Periodically change passwords in control system components and infrastructure devices. * Where applicable, set the controller key-switch/mode-switch to RUN mode. For more information on security with Rockwell Automation products, please refer to Rockwell’s Security Advisory Index http://rockwellautomation.custhelp.com/app/answers/detail/a_id/54102 .