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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.1830 Advisory (ICSA-18-172-02) Rockwell Automation Allen-Bradley CompactLogix and Compact GuardLogix 22 June 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Allen-Bradley CompactLogix Allen-Bradley Compact GuardLogix Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-9312 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-172-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-172-02) Rockwell Automation Allen-Bradley CompactLogix and Compact GuardLogix Original release date: June 21, 2018 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/. 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. 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. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS According to Rockwell Automation, the following products are affected: Allen-Bradley CompactLogix 5370 L1 controllers, Versions 30.012 and prior, Allen-Bradley CompactLogix 5370 L2 controllers, Versions 30.012 and prior, Allen-Bradley CompactLogix 5370 L3 controllers, Versions 30.012 and prior, Allen-Bradley Armor CompactLogix 5370 L3 controllers, Versions 30.012 and prior, Allen-Bradley Compact GuardLogix 5370 controllers, Versions 30.012 and prior, and Allen-Bradley Armor Compact GuardLogix 5370 controllers, Versions 30.012 and prior. 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER INPUT VALIDATION CWE-20 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 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). 3.3 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 3.4 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. 4. 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: o 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). o Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet. o 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 Automations 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: o Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. o Locate control system networks and remote devices behind firewalls, and isolate them from the business network. o 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 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 on the ICS-CERT website in the Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBWyw3zGaOgq3Tt24GAQgXuQ/+PIQ/5aQgi0QJamL5rReu68fiQlGVQHYx sljRZrl0prhLqo2I/5lDz9w4zg97uVlVtnBjzZ+nqtOOBp+7IO69KoQQALweNZxY AwIrjXPY4up9AJsCYC9IP6hwfXT8ADjSNW6w5mo6D28XMFuAC8vMaNetu1eZRdYo HET4rggeNUxlq2piPkf8G+zp4xNarCXm2WJzemTB3n6LR2WNYOvbCWKlu9gAcpaA G/MiwtmGMrASU2N82Gohmp5a+2mbcatVFkUlrnKulG4tccPnACsXpfXr8nTzpVhR r2zcXhfLy1YI3a9Rw//QP+V4rRQvc3NUw+gTZ4RzAylA+OMHr64rutu23vt6IucO x7Ybq+FnF9+/ez+F4sY0ty9Xc8kM73QDPSYdJ8qI9n03yOSw5sFgNenlFywe9Lda pntnkvfHSaIkTtVTKW5ZuItZuug5Nq+iTmK79rNnD2QCaQoDPkOiJa0wnpCQ9w3N EintSbtK7VNIrfoEV5eQB2QtheYP6NlNwAP0bkJ8WvHpHEqJhJkh2MFNftQmx81h gEHINwwxX0SPgm6AgXMH74jteg7V0b3c/qXaFpJF3dt6IGZJipht+yMYf935GqYU zcTZJE8RobL6njNAEpamGaRxEqQUp8pLs35N6lt2GzMxyxeam51X1ll1AvdFt+4W 2OZFqB4nZz4= =3RWQ -----END PGP SIGNATURE-----