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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.0580 Advisory (ICSA-18-058-03): Emerson ControlWave Micro Process Automation Controller 28 February 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Emerson ControlWave Micro Process Automation Controller Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-5452 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-058-03 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-058-03) Emerson ControlWave Micro Process Automation Controller Original release date: February 27, 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/. CVSS v3 7.5 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: Emerson Process Management LLLP Equipment: ControlWave Micro Process Automation Controller Vulnerability: Stack-based Buffer Overflow AFFECTED PRODUCTS The following versions of ControlWave Micro firmware, a family of SCADA RTUs, PLCs, PACs, and flow computers, are affected: ControlWave Micro [ProConOS v.4.01.280] - firmware: CWM v.05.78.00 and prior. IMPACT Exploitation may possibly cause a halt of Ethernet functionality, requiring a cold start to restore the system as well as communications related to ControlWave Designer access. This can possibly result in a loss of system availability and disruption in communications with other connected devices. MITIGATION Emerson offers the following mitigation advice: Assess which ControlWave products in your organization have Ethernet connectivity. Upgrade the affected devices to firmware version 05.79.00 to correct this possible action. System firmware upgrade instructions are available in product documentation (ControlWave Micro Process Automation Controller Instruction Manual, part D301392X012). The resolution described is available only to the user when appropriately incorporated into the application running in ControlWave Micro firmware. Prior to upgrading the system firmware, always perform a full alarm and historical collection (archive files as well as audit logs). The release notes and firmware upgrade are available to registered users at the following link: http://www3.emersonprocess.com/remote/support/v2/login.html (link is external). NCCIC recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should: Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet (link is external). 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 in the NCCIC Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT website. 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. VULNERABILITY OVERVIEW STACK-BASED BUFFER OVERFLOW CWE-121 A stack-based buffer overflow vulnerability caused by sending crafted packets on Port 20547 could force the PLC to change its state into halt mode. CVE-2018-5452 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). RESEARCHER Younes Dragoni of Nozomi Networks reported this vulnerability to NCCIC. BACKGROUND Critical Infrastructure Sectors: Energy, Water and Wastewater Systems Countries/Areas Deployed: Worldwide Company Headquarters Location: Minnesota, USA Contact Information For any questions related to this report, please contact the NCCIC at: Email: NCCICCUSTOMERSERVICE@hq.dhs.gov (link sends e-mail) 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? - --------------------------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). 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