CVE-2024-8947: micropython Use-After-Free

Description

A vulnerability was found in MicroPython 1.22.2. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file py/objarray.c. The manipulation leads to use after free. The attack can be launched remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. Upgrading to version 1.23.0 is able to address this issue. The identifier of the patch is 4bed614e707c0644c06e117f848fa12605c711cd. It is recommended to upgrade the affected component. In micropython objarray component, when a bytes object is resized and copied into itself, it may reference memory that has already been freed.

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CVSS v3.1 Score

5.6

MEDIUM

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

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
micropython	micropython	All

References

Advisories & Patches

https://github.com/micropython/micropython/commit/4bed614e707c0644c06e117f848fa12605c711cd

Exploits

https://github.com/micropython/micropython/issues/13283 https://github.com/micropython/micropython/issues/13283#issuecomment-1918479709

Other References

https://github.com/micropython/micropython/releases/tag/v1.23.0 https://vuldb.com/?ctiid.277765 https://vuldb.com/?id.277765 https://vuldb.com/?submit.409316

Frequently Asked Questions

What is CVE-2024-8947? +

A vulnerability was found in MicroPython 1.22.2. It has been declared as critical. Affected by this vulnerability is an unknown functionality of the file py/objarray.c. The manipulation leads to use after free. The attack can be launched remotely. The complexity of an attack is rather high. The exploitation appears to be difficult. Upgrading to version 1.23.0 is able to address this issue. The identifier of the patch is 4bed614e707c0644c06e117f848fa12605c711cd. It is recommended to upgrade the affected component. In micropython objarray component, when a bytes object is resized and copied into itself, it may reference memory that has already been freed. It has a CVSS v3.1 base score of 5.6 (MEDIUM).

How severe is CVE-2024-8947? +

CVE-2024-8947 has a CVSS v3.1 score of 5.6 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-2024-8947? +

CVE-2024-8947 affects products from micropython, specifically: micropython. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-8947? +

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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