CVE-2021-38195 Overflow in libsecp256k1
The libsecp256k1 Rust library incorrectly verifies invalid signatures by allowing parameters to exceed the curve order, bypassing cryptographic validation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-38195?
CVE-2021-38195 is a critical vulnerability in n/a, published on 8 Aug 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 libsecp256k1 crate before 0.5.0 for Rust. It can verify an invalid signature because it allows the R or S parameter to be larger than the curve order, aka an overflow.
Weakness: CWE-347
Which versions are affected by CVE-2021-38195?
3 open source packages ship an affected version, including libsecp256k1. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
libsecp256k1 crates.io | All versions | 0.5.0 |
libsecp256k1 crates.io | All versions | 0.5.0 |
libsecp256k1 crates.io | From 0.0.0-0 | 0.5.0 |
Products include Parity Libsecp256k1.
How do I fix CVE-2021-38195?
Upgrade libsecp256k1 to 0.5.0 or later.
Is CVE-2021-38195 being exploited?
There is no known exploitation of CVE-2021-38195 in the wild and no public exploit code.
Other vulnerabilities in n/a
Sources
Also known as GHSA-g4vj-x7v9-h82m, RUSTSEC-2021-0076.