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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.1297 Advisory (icsa-21-105-01) Schneider Electric C-Bus Toolkit 16 April 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Schneider Electric C-Bus Toolkit Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-22720 CVE-2021-22719 CVE-2021-22718 CVE-2021-22717 CVE-2021-22716 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-105-01 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-105-01) Schneider Electric C-Bus Toolkit Original release date: April 15, 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 8.8 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Schneider Electric o Equipment: C-Bus Toolkit o Vulnerabilities: Improper Privilege Management, Path Traversal 2. RISK EVALUATION Successful exploitation of these vulnerabilities may allow remote code execution. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of C-Bus Toolkit are affected: o C-Bus Toolkit v1.15.7 and prior 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER PRIVILEGE MANAGEMENT CWE-269 The affected product is vulnerable to Improper Privilege Management, which could allow remote code execution when an unprivileged user modifies a file. CVE-2021-22716 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:L/UI:N/S:U/C:H/ I:H/A:H ). 3.2.2 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL') CWE-22 The affected product is vulnerable to Path Traversal, which could allow remote code execution when processing config files. CVE-2021-22717 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/C:H/ I:H/A:H ). 3.2.3 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL') CWE-22 The affected product is vulnerable to Path Traversal, which could allow remote code execution when restoring project files. CVE-2021-22718 has been assigned to this vulnerability. A CVSS v3 base score of 7.8 has been assigned; the CVSS vector string is ( AV:L/AC:L/PR:N/UI:R/S:U/C:H/ I:H/A:H ). 3.2.4 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL') CWE-22 The affected product is vulnerable to Path Traversal, which could allow remote code execution when a file is uploaded. CVE-2021-22719 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/C:H/ I:H/A:H ). 3.2.5 IMPROPER LIMITATION OF A PATHNAME TO A RESTRICTED DIRECTORY ('PATH TRAVERSAL') CWE-22 The affected product is vulnerable to Path Traversal, which could allow remote code execution when restoring a project. CVE-2021-22720 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/C:H/ I:N/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Commercial Facilities o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: France 3.4 RESEARCHER rgod, working with Trend Micro Zero Day Initiative, and Simon Zuckerbraun of Trend Micro's Zero Day Initiative reported these vulnerabilities to CISA. 4. MITIGATIONS Schneider Electric recommends users update to the latest version available . A reboot will be needed after the update. If users choose not to apply the remediation provided above, they should immediately apply the following mitigations to reduce the risk of exploit: o Use an allow list for this application. o Turn on the workstation's firewall. o Use an antivirus program. o Secure the workstation from unauthorized personnel. Please see Schneider Electric's publication SEVD-2021-103-01 for more information. 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 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. 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 these vulnerabilities. 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. 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