CVE-2020-35918 Unexpected panic when decoding tokens in branca
Attackers can cause a denial of service by sending invalid base62 data to the branca crate, which triggers a panic during token decoding.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-35918?
CVE-2020-35918 is a medium-severity denial of service vulnerability in n/a, published on 31 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in the branca crate before 0.10.0 for Rust. Decoding tokens (with invalid base62 data) can panic.
Which versions are affected by CVE-2020-35918?
3 open source packages ship an affected version, including branca. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
branca crates.io | All versions | 0.10.0 |
branca crates.io | All versions | 0.10.0 |
branca crates.io | From 0.0.0-0 | 0.10.0 |
Products include Hakobaito Branca.
How do I fix CVE-2020-35918?
Upgrade branca to 0.10.0 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-2020-35918 being exploited?
There is no known exploitation of CVE-2020-35918 in the wild and no public exploit code.
Sources
Also known as GHSA-c9rv-3jmq-527w, RUSTSEC-2020-0075.