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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2017.2588 Advisory (ICSA-17-285-04) NXP Semiconductors MQX RTOS 13 October 2017 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: NXP Semiconductors MQX RTOS Publisher: ICS-CERT Operating System: Network Appliance Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated Denial of Service -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2017-12722 CVE-2017-12718 Original Bulletin: https://ics-cert.us-cert.gov/advisories/ICSA-17-285-04 - --------------------------BEGIN INCLUDED TEXT-------------------- Advisory (ICSA-17-285-04) NXP Semiconductors MQX RTOS Original release date: October 12, 2017 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/. CVSS v3 8.1 ATTENTION: Remotely exploitable/low skill level to exploit. Vendor: NXP Semiconductors Equipment: MQX RTOS Vulnerabilities: Classic Buffer Overflow, Out-of-Bounds Read AFFECTED PRODUCTS The following versions of MQX Real-Time Operating System (RTOS) are used in NXPs ColdFire microcontrollers, Kinetis microcontrollers, i.MX processors, and Vybrid processors, which are affected by the vulnerabilities listed below. Versions susceptible to Classic Buffer Overflow Vulnerability: MQX RTOS, Version 5.0 and prior versions, and Versions susceptible to Out-of-Bounds Read Vulnerability: MQX RTOS, Version 4.1 and prior versions. IMPACT Successful exploitation of these vulnerabilities may allow a remote attacker to cause a buffer overflow condition that may, in turn, cause remote code execution or out-of-bounds read conditions, resulting in a denial of service. MITIGATION NXP is planning to release a product fix for MQX, Version 5.1, by January 2018, which will address both vulnerabilities. Until the product fix can be applied, NXP recommends that users consider implementing the following interim mitigations to limit the risk of exploitation of the identified vulnerabilities: For MQX users running Version 5.0, NXP has produced a code modification that can be applied prior to the release of Version 5.1. Users can contact NXP directly via email at MQXsales@NXP.com (link sends e-mail) to get additional information. For MQX users running Version 4.1 and prior versions, NXP recommends that users update to Version 4.2 or Version 5.0, which do not contain the out-of-bounds read vulnerability. NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of these vulnerabilities. Specifically, users should: Minimize network exposure for all control system devices and/or systems, and ensure that they are not accessible from the Internet. Locate control system networks and remote devices behind firewalls, and isolate them from the business network. 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. ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. ICS-CERT 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 in the ICSCERT Technical Information Paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site. Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents. No known public exploits specifically target these vulnerabilities. VULNERABILITY OVERVIEW BUFFER COPY WITHOUT CHECKING SIZE OF INPUT ('CLASSIC BUFFER OVERFLOW') CWE-120 The Real-Time TCP/IP Communications Suite (RTCS) in MQXs DHCP client fails to sanitize all inputs, which may allow maliciously crafted DHCP packets to cause memory to be overwritten, allowing remote code execution. CVE-2017-12718 has been assigned to this vulnerability. A CVSS v3 base score of 8.1 has been assigned; the CVSS vector string is (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H). OUT-OF-BOUNDS READ CWE-125 The DNS client for MQX fails to bounds check DNS response parameters, which may allow maliciously crafted DNS packets to cause memory to be read out-of-bounds, resulting in a denial of service. CVE-2017-12722 has been assigned to this vulnerability. A CVSS v3 base score of 5.3 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L). RESEARCHER Scott Gayou identified and coordinated these vulnerabilities with NXP, CERT/CC, and ICS-CERT. BACKGROUND Critical Infrastructure Sectors: Communications, Critical Manufacturing, Healthcare and Public Health, and Transportation Countries/Areas Deployed: Worldwide Company Headquarters Location: Eindhoven, Netherlands Contact Information For any questions related to this report, please contact ICS-CERT at: Email: ics-cert@hq.dhs.gov (link sends e-mail) Toll Free: 1-877-776-7585 International Callers: (208) 526-0900 For industrial control systems security information and incident reporting: http://ics-cert.us-cert.gov ICS-CERT 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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