wolfSSL and wolfCrypt 4.0.0 and earlier (when configured without --enable-fpecc, --enable-sp, or --enable-sp-math) contain a timing side channel in ECDSA signature generation. This allows a local attacker, able to precisely measure the duration of signature operations, to infer information about the nonces used and potentially mount a lattice attack to recover the private key used. The issue occurs because ecc.c scalar multiplication might leak the bit length.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| wolfcrypt(PyPI) | 0 | 4.1.0 | N/A |
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