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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3139 Advisory (icsa-21-259-02) Schneider Electric EcoStruxure and SCADAPack 17 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric EcoStruxure SCADAPack Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Mitigation CVE Names: CVE-2021-22796 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-259-02 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-259-02) Schneider Electric EcoStruxure and SCADAPack Original release date: September 16, 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 7.8 o ATTENTION: Low attack complexity o Vendor: Schneider Electric o Equipment: EcoStruxure Control Expert, EcoStruxure Process Expert, SCADAPack RemoteConnect for x70 o Vulnerability: Path Traversal 2. RISK EVALUATION Successful exploitation of this vulnerability could result in code execution on the engineering workstation. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following products and versions are affected: o EcoStruxure Control Expert: All versions, including former Unity Pro o EcoStruxure Process Expert: All versions, including former HDCS o SCADAPack RemoteConnect for x70: All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL') CWE-22 When a malicious project file is loaded on the engineering workstation software, it deploys a malicious script to execute arbitrary code in unauthorized locations. CVE-2021-22796 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities, Energy, Food and Agriculture, Government Facilities, Transportation Systems, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: France 3.4 RESEARCHER kimiya, working with Trend Micro Zero's Day Initiative, reported this vulnerability to CISA. 4. MITIGATIONS Schneider Electric is establishing a remediation plan for future versions of the affected products that will include a fix for this vulnerability. CISA will update this document when the remediations are available. Schneider Electric recommends users immediately apply the following mitigations to reduce the risk of exploitation: o Store project files in a secure storage location and limit access to the files to only trusted users. o When exchanging the files over the network, use secure communication protocols. o Harden the workstations running EcoStruxure Control Expert, EcoStruxure Process Expert, or SCADAPack RemoteConnect. o Compute a checksum on all project files and check the consistency of the checksum to verify the integrity before usage. o Start the software without administrator rights to prevent the copying of extracted files in critical system folders. Users still using Unity Pro should strongly consider migrating to EcoStruxure Control Expert. Please contact the local Schneider Electric technical support for more information. To stay informed of all updates, including details on affected products and remediation plans, subscribe to Schneider Electric's security notification service . CISA 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 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 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. CISA also recommends users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open unsolicited attachments in email messages. o Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. o Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. 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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