RUSTSEC-2023-0071

Marvin Attack: potential key recovery through timing sidechannels

Reported

November 22, 2023

Issued

November 28, 2023 (last modified: November 8, 2026)

Package

rsa (crates.io)

Type

Vulnerability

Categories

crypto-failure

Keywords

#cryptography

Aliases

References

CVSS Score

5.9 MEDIUM

CVSS Details

Attack Vector: Network
Attack Complexity: High
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality Impact: High
Integrity Impact: None
Availability Impact: None

CVSS Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Patched

>=0.10.0

Description

Impact

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.

Patches

The rsa v0.10 series includes a migration to crypto-bigint and constant-time mitigations recommended in draft-irtf-cfrg-rsa-guidance. Upgrading to this release should resolve all known constant-time issues.

References

This vulnerability was discovered as part of the "Marvin Attack", which revealed several implementations of RSA including OpenSSL had not properly mitigated timing sidechannel attacks.

Advisory available under CC0-1.0 license.