Rockwell Automation Allen-Bradley CompactLogix and Compact GuardLogix (Update A) Improper Input Validation (CVE-2017-9312)

# ICS Advisory (ICSA-18-172-02) ## Rockwell Automation Allen-Bradley CompactLogix and Compact GuardLogix (Update A) Original release date: June 21, 2018 | Last revised: July 17, 2018 [Print Document](javascript:window.print\(\);) [Tweet](https://twitter.com/share?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-18-172-02) [Like Me](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-18-172-02) [Share](http://www.addthis.com/bookmark.php?url=https%3A%2F%2Fus- cert.cisa.gov%2Fics%2Fadvisories%2FICSA-18-172-02) ### Legal Notice All information products included in [https://us-cert.gov/ics](/ics) 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 [https://www.us- cert.gov/tlp/](/tlp/). * * * ## 1\. EXECUTIVE SUMMARY * **CVSS v3 8.6** * **ATTENTION:** Exploitable remotely/low skill level to exploit * **Vendor:** Rockwell Automation * **Equipment:** Allen-Bradley CompactLogix and Compact GuardLogix * **Vulnerability:** Improper Input Validation ## 2 UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-18-172-02 Rockwell Automation Allen-Bradley CompactLogix and Compact GuardLogix that was published June 21, 2018, on the NCCIC/ICS-CERT website. ## 3\. RISK EVALUATION Successful exploitation of this vulnerability could result in a denial-of- service condition. As a result, the controller goes into a Major Non- Recoverable Fault (MNRF) state, which is considered safe. However, recovery requires the user to download the application program again. ## 4\. TECHNICAL DETAILS ### 4.1 AFFECTED PRODUCTS According to Rockwell Automation, the following products are affected: **\--------- Begin Update A Part 1 of 1 --------** * Allen-Bradley CompactLogix 5370 L1 controllers, Versions 30.014 and prior, * Allen-Bradley CompactLogix 5370 L2 controllers, Versions 30.014 and prior, * Allen-Bradley CompactLogix 5370 L3 controllers, Versions 30.014 and prior, * Allen-Bradley Armor CompactLogix 5370 L3 controllers, Versions 30.014 and prior, * Allen-Bradley Compact GuardLogix 5370 controllers, Versions 30.014 and prior, and * Allen-Bradley Armor Compact GuardLogix 5370 controllers, Versions 30.014 and prior. **\--------- End Update A Part 1 of 1 --------** ### 4.2 VULNERABILITY OVERVIEW **4.2.1 [IMPROPER INPUT VALIDATION CWE-20](https://cwe.mitre.org/data/definitions/20.html)** This vulnerability may allow an attacker to intentionally send a specific TCP packet to the product and cause a Major Non-Recoverable Fault (MNRF), resulting in a denial-of-service condition. [CVE-2017-9312](https://nvd.nist.gov/vuln/detail/CVE-2017-9312) has been assigned to this vulnerability. A CVSS v3 base score of 8.6 has been assigned; the CVSS vector string is ([AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H](https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H)). ### 4.3 BACKGROUND * **CRITICAL INFRASTRUCTURE SECTORS:** Chemical, Critical Manufacturing, Food and Agriculture, Transportation Systems, Water and Wastewater Systems * **COUNTRIES/AREAS DEPLOYED:** Worldwide * **COMPANY HEADQUARTERS LOCATION:** Milwaukee, Wisconsin ### 4.4 RESEARCHER Alexey Perepechko of Applied Risk reported this vulnerability to Rockwell Automation. Rockwell Automation determined there were additional products affected by the vulnerability and reported this information to NCCIC. ## 5\. MITIGATIONS Rockwell Automation recommends users with affected controllers apply firmware revision FRN (31.011 or later) to the affected products. The download can be obtained at the following location: <https://compatibility.rockwellautomation.com/Pages/MultiProductDownload.aspx?crumb=112> Users who are unable to update are directed to employ the following general security guidelines: * Block all traffic to Ethernet/IP or other CIP protocol-based devices from outside the Manufacturing Zone by blocking or restricting access to Port 2222/TCP and UDP and Port 44818/TCP and UDP using proper network infrastructure controls, such as firewalls, UTM devices, or other security appliances. For more information on TCP/UDP ports used by Rockwell Automation Products, see Knowledgebase Article ID 898270 available at: <https://rockwellautomation.custhelp.com/app/answers/detail/a_id/898270/page/1> (login required). * Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet. * 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. When possible, users are recommended to apply the firmware revision in conjunction with the general security guidelines to employ multiple strategies simultaneously. For more information on this vulnerability and more detailed mitigation instructions, please access an account in order to view Rockwell Automation's advisory at the following location: <https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1073708> (login required). NCCIC recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should: * Minimize network exposure for all control system devices and/or systems, and ensure that they are [not accessible from the Internet](/ics/alerts/ICS-ALERT-10-301-01). * Locate control system networks and remote 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. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC also provides a section for [control systems security recommended practices](/ics/content/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](/sites/default/files/recommended_practices/NCCIC_ICS- CERT_Defense_in_Depth_2016_S508C.pdf). Additional mitigation guidance and recommended practices are publicly available on the [ICS-CERT website](/ics/) in the Technical Information Paper, [ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies](/ics/tips/ICS-TIP-12-146-01B). Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to NCCIC for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability.