CVE-2019-13629

MatrixSSL 4.2.1 and earlier contains a timing side channel in ECDSA signature generation. This allows a local or a remote attacker, able to measure the duration of hundreds to thousands of signing operations, to compute the private key used. The issue occurs because crypto/pubkey/ecc_math.c scalar multiplication leaks the bit length of the scalar.

MatrixSSL 4.2.1 and earlier contains a timing side channel in ECDSA signature generation. This allows a local or a remote attacker, able to measure the duration of hundreds to thousands of signing operations, to compute the private key used. The issue occurs because crypto/pubkey/ecc_math.c scalar multiplication leaks the bit length of the scalar.

MatrixSSL versión 4.2.1 y anteriores, contienen un canal lateral de temporización en la generación de firmas ECDSA. Esto permite a un atacante local o remoto, capaz de medir la duración de cientos de miles de operaciones de firma, calcular la clave privada usada. El problema se presenta porque la multiplicación escalar del archivo crypto/pubkey/ecc_math.c pierde la longitud de bits del scalar.