The ECDSA signature implementation in ecdsa.c in Arm Mbed Crypto 2.1 and Mbed TLS through 2.19.1 does not reduce the blinded scalar before computing the inverse, which allows a local attacker to recover the private key via side-channel attacks.
| Software | From | Fixed in |
|---|---|---|
| arm / mbed_tls | 2.17.0 | 2.20.0 |
| arm / mbed_tls | 2.8.0 | 2.16.4 |
| arm / mbed_tls | - | 2.7.13 |
| arm / mbed_crypto | - | 3.0.0 |
| fedoraproject / fedora | 30 | 30.x |
| fedoraproject / fedora | 31 | 31.x |
| debian / debian_linux | 10.0 | 10.0.x |