CVE-2023-7152 MicroPython modselect.c poll_set_add_fd use after free
A use-after-free vulnerability in MicroPython's poll_set_add_fd function allows attackers to potentially execute arbitrary code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-7152?
CVE-2023-7152 is a medium-severity use after free vulnerability in MicroPython, published on 29 Dec 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability, which was classified as critical, has been found in MicroPython 1.21.0/1.22.0-preview. Affected by this issue is the function poll_set_add_fd of the file extmod/modselect.c. The manipulation leads to use after free. The exploit has been disclosed to the public and may be used. The patch is identified as 8b24aa36ba978eafc6114b6798b47b7bfecdca26. It is recommended to apply a patch to fix this issue. VDB-249158 is the identifier assigned to this vulnerability.
Weakness: CWE-416
Which versions are affected by CVE-2023-7152?
4 open source packages ship an affected version, including micropython-copy, micropython-io and micropython-os. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
micropython-copy PyPI | All versions | None |
micropython-io PyPI | All versions | None |
micropython-os PyPI | All versions | None |
micropython-select PyPI | All versions | None |
Products include Micropython Micropython.
How do I fix CVE-2023-7152?
No fix has been published for CVE-2023-7152 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2023-7152 being exploited?
There is no known exploitation of CVE-2023-7152 in the wild and no public exploit code.
Other vulnerabilities in MicroPython
- CVE-2023-7158 MicroPython objslice.c slice_indices heap-based overflow
- CVE-2024-8946 MicroPython VFS Unmount vfs.c mp_vfs_umount heap-based overflow
- CVE-2024-8948 MicroPython objint.c mpz_as_bytes heap-based overflow
- CVE-2024-8947 MicroPython objarray.c use after free
- CVE-2026-1998 micropython runtime.c mp_import_all memory corruption
Sources
Also known as GHSA-jpcc-65j8-6q37, PYSEC-2023-256, PYSEC-2023-257, PYSEC-2023-258, PYSEC-2023-259, UBUNTU-CVE-2023-7152.