11 December 2019
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.4621 Advisory (icsa-19-344-06) Siemens SIMATIC S7-1200 and S7-1500 CPU Families 11 December 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Siemens SIMATIC S7-1200 & S7-1500 CPU Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Modify Arbitrary Files -- Remote/Unauthenticated Provide Misleading Information -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2019-10943 CVE-2019-10929 Original Bulletin: https://www.us-cert.gov/ics/advisories/icsa-19-344-06 - --------------------------BEGIN INCLUDED TEXT-------------------- ICS Advisory (ICSA-19-344-06) Siemens SIMATIC S7-1200 and S7-1500 CPU Families Original release date: December 10, 2019 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 5.3 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Siemens o Equipment: SIMATIC S7-1200 and S7-1500 CPU families o Vulnerabilities: Use of a Broken or Risky Cryptographic Algorithm, Missing Support for Integrity Check 2. RISK EVALUATION Successful exploitation of these vulnerabilities may allow an attacker to modify network traffic or impact the perceived integrity of the user program stored on the CPU. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Siemens reports that these vulnerabilities affect the following SIMATIC products: o SIMATIC ET200SP (incl. SIPLUS variants) Open Controller CPU 1515SP PC: All versions o SIMATIC ET200SP (incl. SIPLUS variants) Open Controller CPU 1515SP PC2: All versions o SIMATIC S7 PLCSIM Advanced: All versions up to and including v3.0 o SIMATIC S7-1200 CPU family (incl. SIPLUS variants): All versions up to and including v4.4 o SIMATIC S7-1500 CPU family (incl. related ET200 CPUs and SIPLUS variants), excluding CPU 1518-4 PN/DP and CPU 1518 MFP (and related SIPLUS variant): All versions up to and including v2.8.1 o SIMATIC S7-1500 Software Controller: All versions 3.2 VULNERABILITY OVERVIEW 3.2.1 USE OF A BROKEN OR RISKY CRYPTOGRAPHIC ALGORITHM CWE-327 An attacker in a man-in-the-middle position could modify network traffic exchanged on Port 102/TCP, due to certain properties in the calculation used for integrity protection. CVE-2019-10929 has been assigned to this vulnerability. A CVSS v3 base score of 3.7 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/ C:N/I:L/A:N ). 3.2.2 MISSING SUPPORT FOR INTEGRITY CHECK CWE-353 An attacker with network access to Port 102/TCP could modify the user program on the PLC in a way that the running code is different from the source code stored on the device. CVE-2019-10943 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/ C:N/I:L/A:N ). 3.3 BACKGROUND o CRITICAL INFRASTRUCTURE SECTORS: Chemical, Critical Manufacturing, Energy, Food and Agriculture, Water and Wastewater Systems o COUNTRIES/AREAS DEPLOYED: Worldwide o COMPANY HEADQUARTERS LOCATION: Germany 3.4 RESEARCHER Eli Biham, Sara Bitan, Aviad Carmel, and Alon Dankner from Faculty of Computer Science, Technion Haifa; Uriel Malin and Avishai Wool from School of Electrical Engineering, Tel-Aviv University; and Artem Zinenko from Kaspersky reported these vulnerabilities to Siemens. 4. MITIGATIONS Siemens has released updates for the following products and recommends users update to the new version. o SIMATIC S7 PLCSIM Advanced: Update to v3.0 o SIMATIC S7-1200 CPU family: Update to v4.4 o SIMATIC S7-1500 CPU family: Update to v2.8.1 Siemens is preparing further updates and recommends specific countermeasures until patches are available: o All affected devices contain a feature called "Access Protection" that prohibits unauthorized modifications of user code. Siemens recommends using access protection to protect affected devices from unauthorized modifications. 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 . 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 these vulnerabilities. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. 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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: email@example.com 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 iQIVAwUBXfBuiGaOgq3Tt24GAQhmWQ//dlgCQTlg1VFoqYs6vAVZhBUhs/DrBIuz ynuf8Nhn4zmX8fJvPo9tKj3LfYbmqCpouTTGcfJPCzgwuDjiqShawvG6Kdk2eCE4 xzMe9DGbzlS2j/lAkNK7F0yrKjd3QmHoFOcWqgTuVANPHbTgXLP50CSbQsnzGi4l 8mwm1qdyP1jjZapFt1NXeHl6OGn4ofOe7EDylNbNfqrCsF/8oKAaLdrg+X7B5dsl OVxkgySDDM2WSurTf/K0jlKczyUazEPRr2o7jf/WDhBwfHPlVOGLwtanHC4QOZ2g RPXAUBDZ5PwAUC+oEL/u6vxCLHxsvFbj/ZOOsIF9pce0FUU6KQ1mQ5F/22g4VyRT 9llWY6iuRnm1/5w6JPPBkhUzayBMW0h70Guw5SoHCbdGrcOUdlNI9c17DETyB2zF jYfdj+3bTbUGZvtl+oKqopBqWb28bRglOqlPPAs3YguRrotmrlA6iWp88ALG81lY K2emyCagX/MJwW2iJWNKJRvaMwkdARm5KPQUKl0nbqmvvMo8bCPxGlvyEcdLUpNA rvCgZBl0Hc/RXHMZ6rfSzpQR1a2bCYF3TSWDXMGLkCiwG+8dBLHYKOwWhrnEv+nx gqPhuH3AOF8AUk7ynHf8KGZuyi+Idpy7YYfobXKe5uu7wQSJCt5bRDLHg9C2w2RW oYtFdK31fH8= =ON5C -----END PGP SIGNATURE-----