CVE-2021-21235 Infinite loop in parsing PNG files in
An attacker can cause a denial of service via an infinite loop by providing a crafted PNG file to the kamadak-exif library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-21235?
CVE-2021-21235 is a medium-severity denial of service vulnerability in kamadak exif-rs, published on 6 Jan 2021. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
kamadak-exif is an exif parsing library written in pure Rust. In kamadak-exif version 0.5.2, there is an infinite loop in parsing crafted PNG files. Specifically, reader::read_from_container can cause an infinite loop when a crafted PNG file is given. This is fixed in version 0.5.3. No workaround is available. Applications that do not pass files with the PNG signature to Reader::read_from_container are not affected.
Which versions are affected by CVE-2021-21235?
3 open source packages ship an affected version, including kamadak-exif. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
kamadak-exif crates.io | From 0.5.2 | 0.5.3 |
kamadak-exif crates.io | From 0.5.2 | 0.5.3 |
kamadak-exif crates.io | From 0.5.2 | 0.5.3 |
Products include Kamadak-Exif Project Kamadak-Exif.
How do I fix CVE-2021-21235?
Upgrade kamadak-exif to 0.5.3 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2021-21235 being exploited?
There is no known exploitation of CVE-2021-21235 in the wild and no public exploit code.
Sources
Also known as GHSA-px9g-8hgv-jvg2, RUSTSEC-2021-0143, UBUNTU-CVE-2021-21235.