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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.4101 Advisory (icsa-21-336-01) Schneider Electric SESU 3 December 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric SESU Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-22799 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-336-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-336-01) Schneider Electric SESU Original release date: December 02, 2021 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 3.8 o ATTENTION: Low attack complexity o Vendor: Schneider Electric o Equipment: Schneider Electric Software Update (SESU) o Vulnerability: Insufficient Entropy 2. RISK EVALUATION Successful exploitation of this vulnerability could cause unintended connection from an internal network to an external network. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of Schneider Electric Software Update, are affected: o Schneider Electric Software Update: v2.3.0 through v2.5.1 Schneider Electric Software Update is used by the following products: o EcoStruxure Augmented Operator Advisor o EcoStruxure Control Expert (formerly known as Unity Pro) o EcoStruxure Process Expert (formerly known as EcoStruxure Hybrid Distributed Control System) o EcoStruxure Machine Expert (formerly known as SoMachine or SoMachine Motion) o EcoStruxure Machine Expert Basic o EcoStruxure Operator Terminal Expert o EcoStruxure Plant Builder o EcoStruxure Power Design o EcoStruxure Automation Expert o EcoStruxure Automation Maintenance Expert o Eurotherm Data Reviewer o Eurotherm iTools o eXLhoist Configuration Software o Schneider Electric Floating License Manager o Schneider Electric License Manager o Harmony XB5SSoft o SoMove o Versatile Software BLUE o Vijeo Designer o OsiSense XX Configuration Software o Zelio Soft 2 Note: This vulnerability affects all products listed above, but this is not a complete list of products. Some of the products might not deliver SESU as part of the product package; however, SESU can be downloaded and used to manage product updates. It may also be possible more components for one product are listed in the "SESU Managed Products" dialog for update. 3.2 VULNERABILITY OVERVIEW 3.2.1 INSUFFICIENT ENTROPY CWE-331 An insufficient entropy vulnerability exists, which could cause unintended connection from an internal network to an external network when an attacker manages to decrypt the SESU proxy password from the registry. CVE-2021-22799 has been assigned to this vulnerability. A CVSS v3 base score of 3.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:C/ C:L/I:N/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Critical Manufacturing, Energy o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: France 3.4 RESEARCHER Nozomi Networks reported this vulnerability to CISA. 4. MITIGATIONS Schneider Electric recommends the following: o If SESU is installed (assuming SESU is configured as "managed product" inside the SESU application) it will indicate a security update is available. Click to download and install the new SESU version. o If SESU is not installed, download SESU (automatic download) and follow the installation instructions. Schneider Electric strongly recommends observing the following industry cybersecurity best practices: o Locate control and safety system networks and remote devices behind firewalls and isolate them from the business network. o Install physical controls so no unauthorized personnel can access your industrial control and safety systems, components, peripheral equipment, and networks. o Place all controllers in locked cabinets and never leave them in the "Program" mode. o Never connect programming software to any network other than the network intended for that device. o Scan all methods of mobile data exchange with the isolated network such as CDs, USB drives, etc. before use in the terminals or any node connected to these networks. o Never allow mobile devices that have connected to any other network besides the intended network to connect to the safety or control networks without proper sanitation. o Minimize network exposure for all control system devices and 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 VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN are only as secure as the connected devices. See Schneider Electric Security Notification SEVD-2021-313-02 for more information. 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 on us-cert.cisa.gov . 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 webpage on us-cert.cisa.gov 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 CISA for tracking and correlation against other incidents. No known public exploits specifically target this vulnerability. This vulnerability is not exploitable remotely. 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). 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