NXP Mititgages i.MX Issues

Wednesday, July 26, 2017 @ 09:07 AM gHale


NXP mitigated multiple vulnerabilities for i.MX Devices used on logic boards, according to a report from ICS-CERT.

Successful exploitation of these vulnerabilities, discovered by Quarkslab, could allow an attacker to cause a denial of service on the device due to a buffer overflow condition.

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When the device is placed in security-enabled mode it is possible for an attacker to exploit memory or a certificate to load an unauthorized image on the device affecting secure boot. Vulnerabilities are only exploitable when the device is placed in security enabled mode.

Devices affected by the stack buffer overflow vulnerability:
• i.MX 50
• i.MX 53
• i.MX 6ULL
• i.MX 6UltraLite
• i.MX 6SoloLite
• i.MX 6Solo
• i.MX 6DualLite
• i.MX 6SoloX
• i.MX 6Dual
• i.MX 6Quad
• i.MX 6DualPlus
• i.MX 6QuadPlus
• Vybrid VF3xx
• Vybrid VF5xx
• Vybrid VF6xx

Devices Affected by the improper certificate validation vulnerability:
• i.MX 28
• i.MX 50
• i.MX 53
• i.MX 7Solo
• i.MX 7Dual
• Vybrid VF3xx
• Vybrid VF5xx
• Vybrid VF6xx
• i.MX 6ULL
• i.MX 6UltraLite
• i.MX 6SoloLite
• i.MX 6Solo
• i.MX 6DualLite
• i.MX 6SoloX
• i.MX 6Dual
• i.MX 6Quad
• i.MX 6DualPlus
• i.MX 6QuadPlus

These vulnerabilities are not remotely exploitable. Moderate skill level is needed to exploit.

In one vulnerability, when the device is configured in security enabled configuration. SDP could be used to download a small section of code to an unprotected region of memory.

CVE-2017-7936 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 5.3.

In addition, when the device is configured in security enabled configuration, under certain conditions it is possible to bypass the signature verification by using a specially crafted certificate leading to the execution of an unsigned image.

CVE-2017-7932 is the case number assigned to this vulnerability, which has a CVSS v3 base score of 6.0.

The products see use in the transportation systems and critical manufacturing sectors. They aslo see action on a global basis.

Because this is a hardware vulnerability, there are no software workarounds available.

For i.MX 6UltraLite and i.MX 6ULL devices, users are encouraged to program an eFUSE to disable the Serial Download Protocol (SDP) port to mitigate the vulnerabilities.

Eindhoven, Netherlands-based NXP reports a mitigation is to prevent physical access to the respective USB OTG or UART ports used by SDP in the final customer production board design.

NXP has confirmed the vulnerabilities have been mitigated in new versions of silicon revisions with an updated ROM module.

For more information NXP released an Errata and Engineering Bulletin that can be obtained from NXP support teams.



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