Threats Tagged 'ghsa-vh45-f885-3848'

The npm package sm-crypto version 0.4.0 and earlier generates SM2 private keys and signing ephemeral scalars using a predictable random number generator in Node.js environments. The library relies on jsbn's SecureRandom, which attempts to seed from window.crypto.getRandomValues in browsers but falls back to non-cryptographic sources (Math.random and wall clock time) in Node.js because window is undefined. This fallback results in keys and ephemeral values that are predictable by attackers who can observe some outputs of Math.random and estimate the generation time. This vulnerability affects the default key generation path without requiring special configuration.