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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2019.0444 Advisory (ICSA-19-043-05) Siemens Intel Active Management Technology of SIMATIC IPCs 13 February 2019 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: SIMATIC IPCs Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Access Privileged Data -- Remote/Unauthenticated Increased Privileges -- Console/Physical Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2018-3658 CVE-2018-3657 CVE-2018-3616 Reference: ESB-2018.2758 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-19-043-05 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-19-043-05) Siemens Intel Active Management Technology of SIMATIC IPCs Original release date: February 12, 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 6.7 o ATTENTION: Exploitable remotely/low skill level to exploit o Vendor: Siemens o Equipment: Intel Active Management Technology (AMT) of SIMATIC IPCs o Vulnerabilities: Cryptographic Issues, Improper Restriction of Operations within the Bounds of a Memory Buffer, Resource Management Errors 2. RISK EVALUATION Successful exploitation of these vulnerabilities may allow arbitrary code execution, a partial denial-of-service condition, or information disclosure. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS The following Siemens products are affected: o SIMATIC FieldPG M5: All versions prior to v22.01.06, o SIMATIC IPC427E: All versions prior to v21.01.09, o SIMATIC IPC477E: All versions prior to v21.01.09, o SIMATIC IPC547E: All versions prior to R1.30.0, o SIMATIC IPC547G: All versions prior to R1.23.0, o SIMATIC IPC627D: All versions prior to v19.02.11, o SIMATIC IPC647D: All versions prior to v19.01.14, o SIMATIC IPC677D: All versions prior to v19.02.11, o SIMATIC IPC827D: All versions prior to v19.02.11, o SIMATIC IPC847D: All versions prior to v19.01.14, and o SIMATIC ITP1000: All versions prior to v23.01.04 3.2 VULNERABILITY OVERVIEW 3.2.1 CRYPTOGRAPHIC ISSUES CWE-310 A Bleichenbacher-style side channel vulnerability in TLS implementation in Intel Active Management Technology before v12.0.5 may allow an unauthenticated user to obtain the TLS session key via the network. CVE-2018-3616 has been assigned to this vulnerability. A CVSS v3 base score of 5.9 has been calculated; the CVSS vector string is ( AV:N/AC:H/PR:N/UI:N/S:U/ C:H/I:N/A:N ). 3.2.2 IMPROPER RESTRICTION OF OPERATIONS WITHIN THE BOUNDS OF A MEMORY BUFFER CWE-119 Multiple buffer overflows in Intel AMT in Intel CSME firmware versions before 12.0.5 may allow a privileged user to execute arbitrary code with Intel AMT execution privilege via local access. CVE-2018-3657 has been assigned to this vulnerability. A CVSS v3 base score of 6.7 has been calculated; the CVSS vector string is ( AV:L/AC:L/PR:H/UI:N/S:U/ C:H/I:H/A:H ). 3.2.3 RESOURCE MANAGEMENT ERRORS CWE-399 Multiple memory leaks in Intel AMT in Intel CSME firmware versions before 12.0.5 may allow an unauthenticated user with Intel AMT provisioned to cause a partial denial-of-service condition via network access. CVE-2018-3658 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:N/A:L ). 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 Siemens reported these vulnerabilities to NCCIC. 4. MITIGATIONS Siemens recommends users upgrade to the latest version. Additional information as well as upgrades can be found at the following link. https://support.industry.siemens.com/cs/us/en/view/109747626 The vulnerabilities are resolved in the following versions for each product listed: o v22.01.06 SIMATIC FieldPG M5 https://support.industry.siemens.com/cs/document/109738122/ simatic-field-pg-m5-latest-bios-versiondti=0&lc=en-US o V21.01.09 SIMATIC IPC427E SIMATIC IPC477E https://support.industry.siemens.com/cs/document/109742593/simatic-ipc427e- (microbox-pc)-ipc-477e-ipc477e-pro-latest-bios-versiondti=0&lc=en-US o R1.30.0 SIMATIC IPC547E https://support.industry.siemens.com/cs/document/109481624/ simatic-ipc547e-latest-bios-versiondti=0&lc=en-US o R1.23.0 SIMATIC IPC547G https://support.industry.siemens.com/cs/document/109750349/ simatic-ipc547g-latest-bios-versiondti=0&lc=en-US o V19.02.11 SIMATIC IPC627D SIMATIC IPC677D SIMATIC IPC827D https://support.industry.siemens.com/cs/document/109474954/simatic-ipc627d- (box-pc)-ipc677d-ipc827d-(box-pc)-latest-bios-versiondti=0&lc=en-US o V19.01.14 SIMATIC IPC647D SIMATIC IPC847D https://support.industry.siemens.com/cs/document/109037779/ simatic-ipc647d-ipc847d-(rack-pc)-latest-bios-versiondti=0&lc=en-US o V23.01.04 SIMATIC ITP1000 https://support.industry.siemens.com/cs/document/109748173/ simatic-itp1000-latest-bios-versiondti=0&lc=en-US Siemens has identified the following specific workarounds and mitigations users can apply to reduce the risk: o As a prerequisite for an attack, an attacker must be able to run malicious code on affected systems. Therefore, Siemens recommends determining if it is possible that untrusted code can be run on these systems, or if existing measures implemented by the operator reduce the likelihood of untrusted code being run. As a general security measure, Siemens strongly recommends protecting network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends configuring e the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security ), and following the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity For additional information see Siemens' security advisory SSA-377318 at the following location: http://www.siemens.com/cert/en/cert-security-advisories.htm Additional information regarding the Intel Active Management Technology (AMT) see: https://www.intel.com/content/www/us/en/security-center/advisory/ intel-sa-00141.html NCCIC 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. NCCIC reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. NCCIC also provides a section for control systems security recommended practices on the ICS-CERT web page. 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-CERT website 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 NCCIC for tracking and correlation against other incidents. NCCIC also recommends that users take the following measures to protect themselves from social engineering attacks: o Do not click web links or open unsolicited attachments in email messages. o Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. o Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. 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. 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. 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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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