CVE-2024-7726: cm6 Missing Auth — Exploit & Fix

Description

There exists an unauthenticated accessible JTAG port on the Kioxia PM6, PM7 and CM6 devices - On the Kioxia CM6, PM6 and PM7 disk drives it was discovered that the 2 main CPU cores of the SoC can be accessed via an open JTAG debug port that is exposed on the drive’s circuit board. Due to the wide cutout of the enclosures, the JTAG port can be accessed without having to open the disk enclosure. Utilizing the JTAG debug port, an attacker with (temporary) physical access can get full access to the firmware and memory on the 2 main CPU cores within the drive including the execution of arbitrary code, the modification of firmware execution flow and data or bypassing the firmware signature verification during boot-up.

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CVSS v3.1 Score

6.8

MEDIUM

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-306 Missing Authentication

Affected Products

Vendor	Product	Versions
kioxia	cm6_firmware	< gpk5
kioxia	cm6	All
kioxia	pm7_firmware	< c40a
kioxia	pm7	All
kioxia	pm6_firmware	< bd0d
kioxia	pm6	All

References

Advisories & Patches

https://github.com/google/security-research/security/advisories/GHSA-3hh8-94j4-62rh

Exploits

https://github.com/google/security-research/security/advisories/GHSA-3hh8-94j4-62rh

Frequently Asked Questions

What is CVE-2024-7726? +

There exists an unauthenticated accessible JTAG port on the Kioxia PM6, PM7 and CM6 devices - On the Kioxia CM6, PM6 and PM7 disk drives it was discovered that the 2 main CPU cores of the SoC can be accessed via an open JTAG debug port that is exposed on the drive’s circuit board. Due to the wide cutout of the enclosures, the JTAG port can be accessed without having to open the disk enclosure. Utilizing the JTAG debug port, an attacker with (temporary) physical access can get full access to the firmware and memory on the 2 main CPU cores within the drive including the execution of arbitrary code, the modification of firmware execution flow and data or bypassing the firmware signature verification during boot-up. It has a CVSS v3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2024-7726? +

CVE-2024-7726 has a CVSS v3.1 score of 6.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-7726? +

CVE-2024-7726 affects products from kioxia, specifically: cm6, cm6_firmware, pm6, pm6_firmware, pm7, pm7_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-7726? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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