14 January 2022
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2022.0183 Advisory (icsa-22-013-05) Siemens COMOS Web 14 January 2022 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens COMOS Web Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Existing Account Cross-site Request Forgery -- Existing Account Cross-site Scripting -- Existing Account Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2021-37198 CVE-2021-37197 CVE-2021-37196 CVE-2021-37195 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-22-013-05 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-22-013-05) Siemens COMOS Web Original release date: January 13, 2022 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: COMOS o Vulnerabilities: Basic XSS, Relative Path Traversal, SQL Injection, Cross-site Request Forgery 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to conduct code injections, store data in undesired locations, execute arbitrary SQL statements, and run cross-site request forgery attacks. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of COMOS Web, a unified data platform, are affected: o COMOS: All versions prior to v10.4.1 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER NEUTRALIZATION OF SCRIPT-RELATED HTML TAGS IN A WEB PAGE (BASIC XSS) CWE-80 The COMOS Web component of COMOS accepts arbitrary code as attachments to tasks, which could allow an attacker to inject malicious code that is then executed when loading the attachment. CVE-2021-37195 has been assigned to this vulnerability. A CVSS v3 base score of 7.7 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/ C:N/I:H/A:N ). 3.2.2 RELATIVE PATH TRAVERSAL CWE-23 The COMOS Web component of COMOS unpacks specially crafted archive files to relative paths, which could allow an attacker to store files in any folder accessible by the COMOS Web webservice. CVE-2021-37196 has been assigned to this vulnerability. A CVSS v3 base score of 6.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/ C:N/I:H/A:N ). 3.2.3 IMPROPER NEUTRALIZATION OF SPECIAL ELEMENTS USED IN AN SQL COMMAND ('SQL INJECTION') CWE-89 The COMOS Web component of COMOS is vulnerable to SQL injections, which could allow an attacker to execute arbitrary SQL statements. CVE-2021-37197 has been assigned to this vulnerability. A CVSS v3 base score of 8.8 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/ C:H/I:H/A:H ). 3.2.4 CROSS-SITE REQUEST FORGERY (CSRF) CWE-352 The COMOS Web component of COMOS uses a flawed implementation of CSRF prevention, which an attacker could exploit to perform cross-site request forgery attacks. CVE-2021-37198 has been assigned to this vulnerability. A CVSS v3 base score of 5.4 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:U/ C:L/I:L/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Multiple Sectors o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Sandro Poppi reported these vulnerabilities to Siemens. 4. MITIGATIONS Siemens has released an update for COMOS and recommends users update to the latest version: o COMOS: Update to v10.4.1 Siemens has not identified any additional specific workarounds or mitigations. As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring the environment according to the Siemens operational guidelines for industrial security and following the recommendations in the product manuals. For additional information, please refer to Siemens Security Advisory SSA-995338 CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should: o Ensure the least-privilege user principle is followed. o Minimize network exposure for all control system devices and/or systems, and ensure 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 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 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. 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