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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2018.2551 Advisory (ICSA-18-240-01) and Advisory (ICSA-18-240-02) 29 August 2018 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric Modicon M221 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-7792 CVE-2018-7791 CVE-2018-7790 CVE-2018-7789 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-18-240-01 https://ics-cert.us-cert.gov/advisories/ICSA-18-240-02 Comment: This bulletin contains two (2) ICS-CERT security advisories. - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-18-240-01) Schneider Electric Modicon M221 Original release date: August 28, 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 o CVSS v3 7.7 o ATTENTION: Exploitable remotely o Vendor: Schneider Electric o Equipment: Modicon M221 o Vulnerabilities: Information Management Errors, Permissions, Privileges, and Access Controls 2. RISK EVALUATION Successful exploitation of these vulnerabilities may allow unauthorized users to replay authentication sequences, overwrite passwords, or decode passwords. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Schneider Electric reports the vulnerabilities affect the following Modicon M221 products: o Modicon M221, all references, all versions prior to firmware v1.6.2.0 3.2 VULNERABILITY OVERVIEW 3.2.1 INFORMATION MANAGEMENT ERRORS CWE-199 This vulnerability allows unauthorized users to replay authentication sequences. If an attacker exploits this vulnerability and connects to a Modicon M221, the attacker may upload the original program from the PLC. CVE-2018-7790 has been assigned to this vulnerability. A CVSS v3 base score of 7.1 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:R/S:U/C:H /I:H/A:L). 3.2.2 PERMISSIONS, PRIVILEGES, AND ACCESS CONTROLS CWE-264 This vulnerability allows unauthorized users to overwrite the original password. If an attacker exploits this vulnerability and overwrites the password, the attacker may upload the original program from the PLC. CVE-2018-7791 has been assigned to this vulnerability. A CVSS v3 base score of 7.7 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L). 3.2.3 PERMISSIONS, PRIVILEGES, AND ACCESS CONTROLS CWE-264 This vulnerability allows unauthorized users to decode the password using a rainbow table. CVE-2018-7792 has been assigned to this vulnerability. A CVSS v3 base score of 7.7 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: France 3.4 RESEARCHER Irfan Ahmed, Hyunguk Yoo, Sushma Kalle, and Nehal Ameen of the University of New Orleans reported these vulnerabilities to NCCIC. 4. MITIGATIONS A fix for these vulnerabilities is implemented in Modicon M221 Firmware v1.6.2.0, delivered within SoMachine Basic v1.6 SP2, which is available for download below, or by using Schneider Electric Software Update tool: https://www.schneider-electric.com/en/download/document/SoMachineBasicV1.6SP2/ As a temporary mitigation, Modicon M221 users should take the following measures: o Set up a firewall blocking all remote/external access to Port 502. o Within the Modicon M221 application, users must disable all unused protocols, especially programming protocol, as described in section "Configuring Ethernet Network" of SoMachine Basic online help. This will prevent remote programming of the M221 PLC. Schneider Electric's security notice SEVD-2018-235-01 is available at the following location: https://www.schneider-electric.com/en/download/document/SEVD-2018-235-01/ 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 these vulnerabilities. High skill level is needed to exploit. 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. - ------------------------------------------------------------------------------- Advisory (ICSA-18-240-02) Schneider Electric Modicon M221 Original release date: August 28, 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 o CVSS v3 4.8 o ATTENTION: Exploitable remotely o Vendor: Schneider Electric o Equipment: Modicon M221 o Vulnerability: Improper Check for Unusual or Exceptional Conditions 2. RISK EVALUATION Successful exploitation of this vulnerability could allow an unauthorized user to remotely reboot the device. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Modicon M221, a programmable logic controller (PLC), are affected: o Modicon M221 all references and versions prior to firmware v1.6.2.0 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER CHECK FOR UNUSUAL OR EXCEPTIONAL CONDITIONS CWE-754 The vulnerability may allow unauthorized users to remotely reboot Modicon M221 using crafted programing protocol frames. CVE-2018-7789 has been assigned to this vulnerability. A CVSS v3 base score of 4.8 has been calculated; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: France 3.4 RESEARCHER Schneider Electric, working with Yehonatan Kfir of Radiflow, reported the vulnerability to NCCIC. 4. MITIGATIONS Schneider Electric reports that a fix for this vulnerability is implemented in Modicon M221 Firmware v1.6.2.0, delivered within SoMachine Basic v1.6 SP2, or by using the Schneider Electric Software Update tool. The download for SoMachine Basic is available at: https://www.schneider-electric.com/en/download/document/SoMachineBasicV1.6SP2/ For more information, see the Schneider Electric security notification at: https://www.schneider-electric.com/en/download/document/SEVD-2018-233-01/ 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. High skill level is needed to exploit. 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 iQIVAwUBW4YxAGaOgq3Tt24GAQjfmw//b7RAfs2UQRHvnQEvVTIhhT4Pr+u3RV1Y beXYY4YJ12zEi+EpRNVOh8EyEWs6jKZxn6i+UnepeiZ685D3kgKxuXwtxoi3T7ec 8jVmBo+LvTHJP9/WKqdN4IDgOaWj6cRXqbICq8hn8TOZFsXe+Wjdl3xapGsvixMP pacWOGZbnbMpjVhU5MVS+U8kfu7LhDrJ3KTkoX5R6MrnPRSf6EXDX70jGk4RyJi7 fgdPLrzUhmqL1w83zhElU1QokqMipAvdsmagQsMKKElLcqHR4rwntREuqO8QRUVH 21Co+rY0lBZOMgtuz8IJkVSKd/xuOKh1BaFTRqfjelEe3LIgmmk4BVQqjAvrfV9A CbTyZ8ucglUGCpNeiVdk5G7by1wj+QIGFI4H0YAttVNyqlJrHeq+P6s/UL0P/hDP AWZzXTZiICWAH+mSG/3VxHAgP1+kILbFPHdAq9v9BkHoVDwHrf1qCVQiFStvbDXR APUk30oHvIu22RysFBZiIU1U3rAW1somqIvzfJno251DFSg/6uMfDhxMAH6LiiM4 Zgi4fBlHB3tfcuhytIeNp4E/6taGW4LvqAnidAPDR5BrHuDRH4aZsksIeWHdUR8r Avg+jmAtuAnjSyM7T77971C3O2jvLEiLnq5wJ2AqPQFeGlUXUZ41m7Cpb0THIm9d Jxci2V5+fDc= =ze44 -----END PGP SIGNATURE-----