CVE-2021-28032 Use after free in nano_arena
A memory safety violation in the Rust nano_arena crate allows out-of-bounds writes or use-after-free, potentially leading to code execution or crashes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-28032?
CVE-2021-28032 is a critical use after free vulnerability in n/a, published on 5 Mar 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in the nano_arena crate before 0.5.2 for Rust. There is an aliasing violation in split_at because two mutable references can exist for the same element, if Borrow<Idx> behaves in certain ways. This can have a resultant out-of-bounds write or use-after-free.
Which versions are affected by CVE-2021-28032?
3 open source packages ship an affected version, including nano_arena. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nano_arena crates.io | All versions | 0.5.2 |
nano_arena crates.io | All versions | 0.5.2 |
nano_arena crates.io | From 0.0.0-0 | 0.5.2 |
Products include Nano Arena Project Nano Arena.
How do I fix CVE-2021-28032?
Upgrade nano_arena to 0.5.2 or later.
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-2021-28032 being exploited?
There is no known exploitation of CVE-2021-28032 in the wild and no public exploit code.
Sources
Also known as GHSA-wp34-mqw5-jj85, RUSTSEC-2021-0031.