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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.4664 Advisory (icsa-22-263-04) Host Engineering Communications Module 21 September 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Host Engineering Communications Module Publisher: ICS-CERT Operating System: Network Appliance Resolution: Patch/Upgrade CVE Names: CVE-2022-3228 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-263-04 Comment: CVSS (Max): 6.5 CVE-2022-3228 (CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) CVSS Source: ICS-CERT Calculator: https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-263-04) Host Engineering Communications Module Original release date: September 20, 2022 Legal Notice All information products included in https://us-cert.cisa.gov/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://us-cert.cisa.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 6.5 o ATTENTION: Exploitable from adjacent network/low attack complexity o Vendor: Host Engineering o Equipment: H0-ECOM100 Communications Module o Vulnerability: Stack-based Buffer overflow 2. RISK EVALUATION Successful exploitation of this vulnerability could crash the device being accessed, leading to a denial-of-service condition. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following firmware versions of H0-ECOM100 Communications Module, a module to communicate with programmable logic controllers, are affected: o Firmware v5.0.155 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 STACK-BASED BUFFER OVERFLOW CWE-121 Using custom code, an attacker can write into name or description fields on the affected product larger than the appropriate buffer size causing a stack-based buffer overflow. This may allow an attacker to crash the affected device or cause it to become unresponsive. CVE-2022-3228 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is ( AV:A/AC:L/PR:N/UI:N/S:U/C:N/ I:N/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: United States 3.4 RESEARCHER David Formby and Caleb Purcell of Fortiphyd Logic reported this vulnerability to CISA. 4. MITIGATIONS Host Engineering recommends the following to mitigate the risk: To update the firmware in the H0-ECOM100 to version v5.0.156 or later, use the free program utility called NetEdit3, downloadable from Host Engineering's Website , then use the follow steps: 1. In the NetEdit3 software's menu, select File --> Download Newest Firmware (Live Update).... This pulls up the Live Update dialog 2. In the Live Update dialog, press the <Go!> button, and the window will indicate which files were uploaded and their storage locations (there are default locations). 3. Press the <OK> button to exit the Live Update dialog. Upon exiting this dialog, NetEdit3 will scan the network for new devices and only the Host Engineering Ethernet devices (like the H0-ECOM100) will respond and be displayed in a list. 4. Host Engineering recommends ceasing all communication with the H0-ECOM100 before attempting to update its firmware. Specifically, the PLC in should be placed in Stop mode and/or disconnecting all other devices, such as HMIs or other ECOM100s, potentially communicating with it. 5. Once the list displays in NetEdit3, right-click H0-ECOM100 and select, Update Firmware.... This will pull up an Open file dialog. However, in the File name parameter, the latest firmware file will already be selected. 6. Press the <Open> button. This will pull up the Confirm Update dialog asking a user to continue. 7. Press the <Yes> button to update the firmware. CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability these vulnerabilities. Specifically, users should: o Minimize network exposure for all control system devices and/or systems, and ensure they are not accessible from the Internet . o Locate control system networks and remote devices behind firewalls and isolate them from business networks. o When remote access is required, use secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as its connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage at cisa.gov/ics . Several CISA products detailing cyber defense best 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 webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies . Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. For any questions related to this report, please contact the CISA at: Email: CISAservicedesk@cisa.dhs.gov Toll Free: 1-888-282-0870 CISA 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: https://auscert.org.au/gpg-key/ iQIVAwUBYypxpskNZI30y1K9AQjnvBAAkydfj7LRYQ/OlbwAlJXp5Xh71rIzl0QL sOy5IA4tsqRVvlIcNwxKZybOt+gVjDcWroFzj0GB9gMCzvyuDts8cSQZDFU1UNru PwZ2jO9gWnVE4ow1ZPWK8+BZDb0I0bAq0XFVvN3kX9Z22fPEzHQv6RpmpoWkFIeQ obw2/8n6ufh40j6WU3y/zjNlUaRBFI07n+UCiiERPsH3YWA+WYgAcCQwhZ/ggI9b pncGTYR0iix354nZX0mwWsla8lJkj9QeGqtHm8Kf7ce4zWYCR5QR2ansvlTVKJLF AVz5+6/FTkmf1HICQfaU2w5Y8d4CYMC1nmewURdkMLMw2O9JeXUIdfJTveO9n0MY LywtVu9lcI5Oi3fvBWJfEnXDxx+Vn33CJYEJJVQAVOERXjFNV8bGDVtqbSeR4JF1 3siqDujqI3dA5gPwwzRG5txvi38jzwx8PS3/w0wBJSteOju7W3A8JI2WJBP9U8u5 rIF2tiA/neMLGZqvzh1nteh+Nov0fUJjb2lscQv+yUyx2RKRBXbGS1ru62vWOImy Q5OMj9bPbx26TfELQST5di+87mJSGvFjgVBTr0DVGBJTOntAF2Eh88QOcKvB0eLs j/rd+89dpodkfEZwXx30xD9rmIGl5Ku/cY0Te+wA3+tx00RIhd4x3IFH4fWkN9dL strrHcoeQs8= =QKvP -----END PGP SIGNATURE-----