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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2575 Advisory (icsa-21-210-02) Wibu-Systems CodeMeter Runtime 30 July 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Wibu-Systems CodeMeter Runtime Publisher: ICS-CERT Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact/Access: Denial of Service -- Remote/Unauthenticated Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2021-20094 CVE-2021-20093 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-210-02 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-210-02) Wibu-Systems CodeMeter Runtime Original release date: July 29, 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 9.1 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Wibu-Systems AG o Equipment: CodeMeter Runtime o Vulnerabilities: Buffer Over-read 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to read data from the heap of the CodeMeter Runtime network server, or crash the CodeMeter Runtime Server (i.e., CodeMeter.exe). 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of CodeMeter Runtime, a license manager, are affected: o CodeMeter Runtime: All versions prior to v7.21a This license manager is used in the products of many different vendors. 3.2 VULNERABILITY OVERVIEW 3.2.1 BUFFER OVER-READ CWE-126 An attacker could send a specially crafted packet to the CodeMeter Runtime CmWAN server to cause a denial-of-service condition. CVE-2021-20094 has been assigned to this vulnerability. A CVSS v3 base score of 7.5 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:N/I:N/A:H ). 3.2.2 BUFFER OVER-READ CWE-126 An attacker could send a specially crafted packet that could crash the server or direct the CodeMeter Runtime Network Server to send back packets containing data from the heap. CVE-2021-20093 has been assigned to this vulnerability. A CVSS v3 base score of 9.1 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:H/I:N/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Multiple o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Tenable, Inc., reported these vulnerabilities to CISA. 4. MITIGATIONS Wibu-Systems recommends the following mitigations: o Update to Version 7.21a or later. CVE-2021-20093: o Run CodeMeter as client only and use localhost as binding for the CodeMeter communication. With binding to localhost an attack is no longer possible via remote network connection. The network server is disabled by default. o If it is not possible to disable the network server, using a host-based firewall to restrict access to the CmLAN port can reduce the risk. CVE-2021-20094: o The CmWAN server is disabled by default. Check if CmWAN is enabled and disable the feature if it is not needed. o Run the CmWAN server only behind a reverse proxy with user authentication to prevent attacks from unauthenticated users. o The risk of an unauthenticated attacker can be further reduced by using a host-based firewall that only allows the reverse proxy to access the CmWAN port. For more information on this issue, please see Wibu security advisories: WIBU-210423-01 , WIBU-210423-02 For more information on products dependent on the affected CodeMeter see the following vendor security advisories. As new instances are discovered/reported, they will be added to this list: o Siemens: SSA-675303 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. 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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