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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.3140.2 Advisory (icsa-21-259-01) Siemens RUGGEDCOM ROX 15 October 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens RUGGEDCOM ROX Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Root Compromise -- Existing Account Access Confidential Data -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-37175 CVE-2021-37174 CVE-2021-37173 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-259-01 Revision History: October 15 2021: Advisory updated significantly with further details regarding root compromise September 17 2021: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-259-01) Siemens RUGGEDCOM ROX (Update A) Original release date: October 14, 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: Siemens o Equipment: RUGGEDCOM ROX - --------- Begin Update A Part 1 of 2 --------- o Vulnerabilities: Improper Privilege Management, Execution with Unnecessary Privileges, Improper Handling of Insufficient Permissions or Privileges - --------- End Update A Part 1 of 2 --------- 2. UPDATE INFORMATION This updated advisory is a follow-up to the original advisory titled ICSA-21-259-01 Siemens RUGGEDCOM ROX that was published September 16, 2021, to the ICS webpage on us-cert.cisa.gov. 3. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to gain root access to the affected devices. 4. TECHNICAL DETAILS 4.1 AFFECTED PRODUCTS The following versions of RUGGEDCOM ROX are affected: o RUGGEDCOM ROX MX5000: All versions prior to v2.14.1 o RUGGEDCOM ROX RX1400: All versions prior to v2.14.1 o RUGGEDCOM ROX RX1500: All versions prior to v2.14.1 o RUGGEDCOM ROX RX1501: All versions prior to v2.14.1 o RUGGEDCOM ROX RX1510: All versions prior to v2.14.1 o RUGGEDCOM ROX RX1511: All versions prior to v2.14.1 o RUGGEDCOM ROX RX1512: All versions prior to v2.14.1 o RUGGEDCOM ROX RX1524: All versions prior to v2.14.1 o RUGGEDCOM ROX RX1536: All versions prior to v2.14.1 o RUGGEDCOM ROX RX5000: All versions prior to v2.14.1 4.2 VULNERABILITY OVERVIEW - --------- Begin Update A Part 2 of 2 --------- 4.2.1 IMPROPER PRIVILEGE MANAGEMENT CWE-269 The command line interface of affected devices insufficiently restricts file read and write operations for low privileged users. This could allow an authenticated remote attacker to escalate privileges and gain root access to the device. CVE-2021-37173 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 ). - --------- End Update A Part 2 of 2 --------- 4.2.2 EXECUTION WITH UNNECESSARY PRIVILEGES CWE-250 The affected devices have a privilege escalation vulnerability that could allow an attacker to gain root user access. CVE-2021-37174 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 ). 4.2.3 IMPROPER HANDLING OF INSUFFICIENT PERMISSIONS OR PRIVILEGES CWE-280 The affected devices do not properly handle permissions to traverse the file system. If exploited, an attacker could gain access to an overview of the overview of the complete file system on the affected devices. CVE-2021-37175 has been assigned to this vulnerability. A CVSS v3 base score of 4.3 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/C:L/ I:N/A:N ). 4.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 4.4 RESEARCHER Michael Messner from Siemens Energy reported these vulnerabilities to Siemens. 5. MITIGATIONS Siemens has released an update and recommends users update to v2.14.1 or later version. Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk: o Apply the principle of least privileges for accounts configured on the affected devices. As a general security measure, Siemens strongly recommends users protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends users configure the environment according to Siemens' operational guidelines for industrial security and follow the recommendations in the product manuals. Additional information on industrial security by Siemens can be found at: https://www.siemens.com/industrialsecurity For more information about this issue, please see Siemens Security Advisory SSA-150692 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. 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. 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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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