CVE-2018-0732

Durante los acuerdos de clave en un handshake TLS mediante un conjunto de cifrado basado en DH(E), un servidor malicioso puede enviar un valor primo muy grande al cliente. Esto provocará que el cliente gaste una cantidad de tiempo demasiado grande generando una clave para este primo, lo que resulta en un bloqueo hasta que termine el cliente. Esto podría explotarse en un ataque de Denegación de servicio (DoS). Se ha solucionado en OpenSSL 1.1.0i-dev (afecta a 1.1.0-1.1.0h). Se ha solucionado en OpenSSL 1.0.2p-dev (afecta a 1.0.2-1.0.2o).

Keegan Ryan discovered that OpenSSL incorrectly handled ECDSA key generation. An attacker could possibly use this issue to perform a cache-timing attack and recover private ECDSA keys. Guido Vranken discovered that OpenSSL incorrectly handled very large prime values during a key agreement. A remote attacker could possibly use this issue to consume resources, leading to a denial of service. Alejandro Cabrera Aldaya, Billy Brumley, Cesar Pereida Garcia and Luis Manuel Alvarez Tapia discovered that OpenSSL incorrectly handled RSA key generation. An attacker could possibly use this issue to perform a cache-timing attack and recover private RSA keys. Various other issues were also addressed.