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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0341 A vulnerability has been identified in Rockwell Automation EtherNet/IP Web Server Modules 6 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Rockwell Automation EtherNet/IP Web Server Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Mitigation CVE Names: CVE-2018-19016 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-19-036-02 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-19-036-02) Rockwell Automation EtherNet/IP Web Server Modules Original release date: February 05, 2019 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 5.3 ATTENTION: Exploitable remotely/low skill level to exploit Vendor: Rockwell Automation Equipment: EtherNet/IP Web Server Modules Vulnerability: Improper Input Validation 2. RISK EVALUATION Successful exploitation of this vulnerability could allow a remote attacker to deny communication with Simple Network Management Protocol (SNMP) service. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of EtherNet/IP web server module, a web server module, are affected: 1756-EWEB (includes 1756-EWEBK) Version 5.001 and earlier, and CompactLogix 1768-EWEB Version 2.005 and earlier. 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER INPUT VALIDATION CWE-20 A remote attacker could send a crafted UDP packet to the SNMP service causing a denial-of-service condition to occur until the affected product is restarted. CVE-2018-19016 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). 3.3 BACKGROUND CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing COUNTRIES/AREAS DEPLOYED: Worldwide COMPANY HEADQUARTERS LOCATION: France 3.4 RESEARCHER Rockwell Automation working with Tenable reported this vulnerability to NCCIC. 4. MITIGATIONS Rockwell Automation recommends that affected users disable the SNMP service if not in use. For more information please refer to the Rockwell Automation security advisory at (login required): https://rockwellautomation.custhelp.com/app/answers/detail/a_id/1084268 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. 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 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. Contact Information For any questions related to this report, please contact the NCCIC at: Email: NCCICCUSTOMERSERVICE@hq.dhs.gov Toll Free: 1-888-282-0870 For industrial control systems cybersecurity information: http://ics-cert.us-cert.gov or incident reporting: https://ics-cert.us-cert.gov/Report-Incident? The NCCIC continuously strives to improve its products and services. You can help by choosing one of the links below to provide feedback about this product. - --------------------------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 iQIVAwUBXFpxgmaOgq3Tt24GAQgqpA//S4r+vUfrQyZx3xotNkOjgErLs8lFlYJk Ml8ivRtIANC5C9hCrDYbla1Hjp8a6upY2XEDujIatO3ENVHP+CsdBDtTMZWdAXmo wH6vbDzEhENLSb94XR+PIy38cqqAdv9BpgrVIVSQ73yQPUoHr6ux6icZG+PXE3w4 7bHIO3EgbzfRE5Nnx7BwgBXQLH3PK7ltywjU/ltnnRYqRReNLeZzCtgDkSpLJiPK /MV7COvMM8FCqfc/4Wtpx5rs2dPJNVUGG8lHRbuCPYUMKNe72tmUCrDbYDZ2TgJq +5+sdE7yRoHE8mW/hsBNQ4QIndwEk0q3Wubuyn7cXAQBeEyBVdS0wvIV25JPHzV9 OOtRoRR+F3XZhOtiYwMEGd66HeBeIHXiy3Iy8rBtmMLayX3za9aXOKeq07jkvz8/ MZjHcDPdWKTl7scZlqyNAHNglvkEYlhow+32lPBwft6I4dE2tsMogsgKVb9I4HAA 2RpVPULDa2t1d+/NyO8bCt85yDZyQo5yQdw0dwd/s+4yjRpipGDg0mvcx//92zZx KsEwoBxF/FYsIxQpQVpWkt7vABamb1QO3J1ytlnU+XDi1KwTMWs5O/Gf2r4znXrA 9nies8Vhq6nksD+fsLQwuJJZcYPI+QbREOuIDOxhdA/TwMbymmvjR+xj9q8Z5jLR ODLH3ETtMa4= =SX+o -----END PGP SIGNATURE-----