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CVE-2023-49092 — RustCrypto/RSA vulnerable to a Marvin Attack via key recovery through timing sidechannels

Affected: RustCrypto RSA

RustCrypto/RSA is a portable RSA implementation in pure Rust. Due to a non-constant-time implementation, information about the private key is leaked through timing information which is observable over the network. An attacker may be able to use that information to recover the key. There is currently no fix available. As a workaround, avoid using the RSA crate in settings where attackers are able to observe timing information, e.g. local use on a non-compromised computer.

GHSA-4grx-2x9w-596c — Marvin Attack: potential key recovery through timing sidechannels

Affected: crates.io: rsa

The [Marvin Attack] is a timing sidechannel vulnerability which allows performing RSA decryption and signing operations as an attacker with the ability to observe only the time of the decryption operation performed withthe private key.

A recent survey of RSA implementations found that the Rust `rsa` crate is one of many implementations vulnerable to this attack.

No fixed version is available at this time.

[Marvin Attack]: https://people.redhat.com/~hkario/marvin/