CVE-2023-42363 Use after free in n/a

Medium 5.5 Published 27 Nov 2023 Updated 2 Aug 2024

A use-after-free in BusyBox's xasprintf function allows attackers to execute arbitrary code or cause denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: Available

What is CVE-2023-42363?

CVE-2023-42363 is a medium-severity use after free vulnerability in n/a, published on 27 Nov 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A use-after-free vulnerability was discovered in xasprintf function in xfuncs_printf.c:344 in BusyBox v.1.36.1.

Weakness: CWE-416

Which versions are affected by CVE-2023-42363?

It affects 1 product.

Linux distribution packages (1)

trivy openSUSE:Tumbleweed All versions 0.54.1-1.1

Products include Busybox Busybox.

How do I fix CVE-2023-42363?

Apply the vendor's patch.

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-2023-42363 being exploited?

There is no known exploitation of CVE-2023-42363 in the wild and no public exploit code.

Sources

Also known as ALPINE-CVE-2023-42363, AZL-33336, AZL-34574, BELL-CVE-2023-42363, CLEANSTART-2026-YT63201, DEBIAN-CVE-2023-42363 and 8 more.