03 June 2020
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.1928 Advisory (icsa-20-154-06) SWARCO CPU LS4000 3 June 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: SWARCO CPU LS4000 Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Root Compromise -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-12493 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-20-154-06 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-154-06) SWARCO CPU LS4000 Original release date: June 02, 2020 Legal Notice All information products included in https://us-cert.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://www.us-cert.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 10.0 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: SWARCO TRAFFIC SYSTEMS o Equipment: CPU LS4000 o Vulnerability: Improper Access Control 2. RISK EVALUATION Successful exploitation of this vulnerability could allow access to the device and disturb operations with connected devices. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS CERT VDE reports the vulnerability affects the following traffic light controller: o CPU LS4000: All OS versions starting with G4 3.2 VULNERABILITY OVERVIEW 3.2.1 IMPROPER ACCESS CONTROL CWE-284 An open port used for debugging grants root access to the device without access control via network. CVE-2020-12493 has been assigned to this vulnerability. A CVSS v3 base score of 10.0 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:C/ C:H/I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Transportation Systems o COUNTRIES/AREAS DEPLOYED: Europe o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Martin Aman (ProtectEM) reported this vulnerability in coordination with CERT@VDE 4. MITIGATIONS SWARCO TRAFFIC SYSTEMS released a patch to fix the vulnerability and close the port. Please contact SWARCO TRAFFIC SYSTEMS for further information. CERT@VDE published VDE-2020-016 regarding this vulnerability. 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.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.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 firstname.lastname@example.org 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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On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXtcvu+NLKJtyKPYoAQj3dg//ZTkm29CzZWMRee6XG+MQWfas30AfUqm0 +58mz2pg4Wm2uudkuwbFRWKgOLt1/Z+LdNN5fhBV0B3Xfu9KYhwtmOVzu8KEdNHH HkYmO8Sm0wt/S6Tu048PpKzaHUR+QdyWs+NKi4opnRtU0YvDvVoUyF+98PVZh/Vw +SR/k4n8qA/mom0bDr8TfAQI4bzlbjKr5OzqjRxdgJKlg90+kxZtrwikwXQPSYEl qxkJN2vu/Oz8G030RFf6WO4bfpiZmxch+8XiXC2Fzb3T5WgkUTf6ZxE/sKAq1hAk 4YGbDI+C+0Ke9y7nXWUq/kj+VoiFHJPmcMs6oX1lg1GYsiMvI3BmUR+b9lvsrugm ZERrodslvrDRBQQrQ7gah9vVaSyB6X+NmLK3qUBsb09dQjXORk+lyWEQij5VSfZm 4FZkCH38imlmFqyY4kaclHzM9QSY43I2kOT7h7o+LMSTv3vDD64UmL/M4D18Cpoa BFdzXQXa7tha/cBuKNT9YrSr3Uh9snJ0xXbvUI6evSMmlyrp9d4DrL86oKeMQB/P R40wZRWOc5Mutb5oJOBtHr+emyZ09bsw9erK2OXhq0qritBlwD5DDaJPsE4Q7/yB 6wrUJeVlEBh4Xueq2rhSWqyazA+8Nwg2K/q/PVoeyoFLuQKF5vBxW4XPs+0Egwuw SLQ/aEHEzJs= =mBu/ -----END PGP SIGNATURE-----