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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.2301 Advisory (icsa-21-026-01-0) All Bachmann M1 System Processor Modules 2 July 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Bachmann M1 System Processor Products Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Access Privileged Data -- Existing Account Reduced Security -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2020-16231 Original Bulletin: https://us-cert.cisa.gov/ics/advisories/icsa-21-026-01-0 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-21-026-01) All Bachmann M1 System Processor Modules Original release date: July 01, 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 7.2 o ATTENTION: Exploitable remotely/low attack complexity o Vendor: Bachmann Electronic, GmbH o Equipment: All M-Base Controllers o Vulnerability : Use of Password Hash with Insufficient Computational Effort 2. REPOSTED INFORMATION This updated advisory is a follow-up to the advisory titled ICSA-21-026-01P All Bachmann M1 System Processor Modules, posted to the HSIN ICS library on January 26, 2021. This advisory is now being released to the ICS webpage on us-cert.cisa.gov. 3. RISK EVALUATION Successful exploitation of this vulnerability could allow an unauthenticated remote attacker to gain access to the password hashes of the controller if Security Level 4 is not in use as recommended. In the recommended Security Level 4 setting, an authenticated remote attacker could get access to user credentials. 4. TECHNICAL DETAILS 4.1 AFFECTED PRODUCTS o All M-Base Operating Systems and Middleware versions since MSYS v1.06.14 are affected, which include the following M1 Hardware Controllers: MX207, MX213, MX220, MC206, MC212, MC220, MH230. This list indicates actively supported controllers. o MC205, MC210, MH212, ME203, CS200, MP213, MP226, MPC240, MPC265, MPC270, MPC293, MPE270, CPC210. This list indicates End-of-Life controllers. 4.2 VULNERABILITY OVERVIEW 4.2.1 USE OF PASSWORD HASH WITH INSUFFICIENT COMPUTATIONAL EFFORT CWE-916 The affected M-Base Controllers use weak cryptography to protect device passwords. Security Level 0 is set at default from the manufacturer, which could allow an unauthenticated remote attacker to gain access to the password hashes. Security Level 4 is susceptible if an authenticated remote attacker or an unauthenticated person with physical access to the device reads and decrypts the password to conduct further attacks. CVE-2020-16231 has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:H/UI:N/S:U/ C:H/I:H/A:H ). 4.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Energy, Transportation Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Austria 4.4 RESEARCHER 5. MITIGATIONS Bachmann recommends its direct users and original equipment manufacturers (OEM) update to Version 4.49-P1, which is available under item number 00036634-90. To obtain Version 3.95R-P8 the end user is required to contact their key account manager or technical support agent at Bachmann. Asset owners should contact their OEM or reseller for patches. Bachmann does not provide support directly to asset owners. Please refer to the Bachmann Customer Information Note for more details. The password "_pC5#3fS@Y8s" is required to access. If asset owners are unable to update to the latest version or a patch is not available from the OEM or reseller, Bachmann recommends the following mitigations to be put in place: o Update the default username and password in the default Bachmann login handler for field operations. o Direct users or OEMs may utilize their own login handler (e.g., LDAP, Radius, etc.) to circumvent the default authentication handler. Security Level 4 is still recommended for field operations. o Restrict physical access to the device to authorized personnel only. Default Security Level 0 within Bachmann controllers is inherently insecure and should not be used in field operations. Security Levels 1, 2, and 3 are also not recommended for field operations. The use of Telnet, FTP, and Console access during field operations may result in the exploitation of inherent vulnerabilities such as unauthenticated access or exposure of sensitive information. Bachmann strongly recommends users apply Security Level 4, where communication with the device is limited to TLS protected services and all insecure services are disabled. 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 this vulnerability. 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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