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AUSCERT External Security Bulletin Redistribution
Advisory (ICSA-17-285-04) NXP Semiconductors MQX RTOS
13 October 2017
AusCERT Security Bulletin Summary
Product: NXP Semiconductors MQX RTOS
Operating System: Network Appliance
Impact/Access: Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2017-12722 CVE-2017-12718
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NXP Semiconductors MQX RTOS
Original release date: October 12, 2017
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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
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.
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.
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
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
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.
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
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
Scott Gayou identified and coordinated these vulnerabilities with NXP,
CERT/CC, and ICS-CERT.
Critical Infrastructure Sectors: Communications, Critical Manufacturing,
Healthcare and Public Health, and Transportation
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Eindhoven, Netherlands
For any questions related to this report, please contact ICS-CERT at:
Email: email@example.com (link sends e-mail)
Toll Free: 1-877-776-7585
International Callers: (208) 526-0900
For industrial control systems security information and incident reporting:
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
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