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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2020.0157 Advisory (icsa-20-014-02) Siemens SINEMA Server 16 January 2020 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SINEMA Server Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Root Compromise -- Existing Account Resolution: Patch/Upgrade CVE Names: CVE-2019-10940 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-20-014-02 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-20-014-02) Siemens SINEMA Server Original release date: January 14, 2020 Legal Notice All information products included in http://ics-cert.us-cert.gov 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 http://www.us-cert.gov/tlp/ . 1. EXECUTIVE SUMMARY o CVSS v3 9.9 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Siemens o Equipment: SINEMA Server o Vulnerability: Incorrect Privilege Assignment 2. RISK EVALUATION Successful exploitation of this vulnerability could allow an attacker with a valid session, with low privileges, to perform firmware updates and other administrative operations on connected devices. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following versions of SINEMA Server, a network management software, are affected: o All versions prior to Version 14.0 SP2 Update 1 3.2 VULNERABILITY OVERVIEW 3.2.1 INCORRECT PRIVILEGE ASSIGNMENT CWE-266 Incorrect session validation could allow an attacker with a valid session, with low privileges, to perform firmware updates and other administrative operations on connected devices. CVE-2019-10940 has been assigned to this vulnerability. A CVSS v3 base score of 9.9 has been assigned; the CVSS vector string is ( AV:N/AC:L/PR:L/UI:N/S:C/C:H/ I:H/A:H ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Antonin Rahon from Agilicom reported this vulnerability to Siemens. 4. MITIGATIONS Siemens recommends that affected users update to Version 14.0 SP2 Update 1 Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk: o Restrict network access to device Port 443/TCP to trusted IP addresses. o Restrict low-privileged accounts access to trusted persons. 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 see the Siemens security advisory . 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. - --------------------------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). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQIVAwUBXh+xuWaOgq3Tt24GAQi5dhAAmlgmIrGQ0OxeCZbWjNseMDYvg/hTt9LO legFIxXC9M7r3duVOE3ivykzXYcnZ/BoLhPAoJ+YYogg8tCBF6nmN6csUMMBYdQt 4GzjulAjFvRCo8beBiTmB7IMXSlX1Ww7nIzy8PJs5/4A+hcHeCYNnPL2bcfgxWAG hrj44NEjgT7nl3AJ+xlOkbq7PXqwr1u/RYrvx/0kS+gQo+I1iCM/cTZ1yNZaNXkq zfrnlibX/H8MHI3s7OzyiBwmF1h/PVU7oc4e51j3OA4Y/QKNbLhYkfOEfDIVo2h5 gQQBrKrqoChr/4qonSQddsAOcuHrRmHmrp1i/BUksrWcKrZh3t2Ler3a/nPfw4BH eKxDoggGbyRiY0EbIdXIJGRik6/Uva7rm3L2wdFte2t0GWo7NrMLo2IJcDKMWGIF MUanxJvK/wckpoiPfAUuYBTv2f46LOliRbRh3HRi0cJePwtxgZtIbr9cM5juf8Od M5BeDhUuyTqLioZ97GH36vys7UnmHaCAfNbtvG/V46GM+G4LZQzukCxkCvasGLNq lbh4Ne06+atVC987Z4/0IG8mf6fy3FFLzwmON22DtRqAhpJaHCs4eUA8ipkfeTrR CISXbeYmOH5kRWVRzy4xv3sMelm16Fu1MfjPQOg2mSv0kBz1Z405fnqx0zqdtkKv koMkeD/MNdA= =Ir/B -----END PGP SIGNATURE-----