CVE-2014-3569

La función ssl23_get_client_hello en s23_srvr.c en OpenSSL 0.9.8zc, 1.0.0o y 1.0.1j no maneja adecuadamente los intentos de utilizar protocolos no soportados, lo que permite a atacantes remotos causar una denegación de servicio (referencia a puntero NULL y caída de demonio) a través de un apretón de manos no esperado, según lo demostrado por un apretón de manos SSLv3 a una aplicación no-ssl3 con ciertos manejos de errores. NOTA: este problema se volvió relevante después de la corrección de CVE-2014-3568.

A carefully crafted DTLS message can cause a segmentation fault in OpenSSL due to a NULL pointer dereference. A memory leak can occur in the dtls1_buffer_record function under certain conditions. When OpenSSL is built with the no-ssl3 option and a SSL v3 ClientHello is received the ssl method would be set to NULL which could later result in a NULL pointer dereference. An OpenSSL client will accept a handshake using an ephemeral ECDH ciphersuite using an ECDSA certificate if the server key exchange message is omitted. An OpenSSL client will accept the use of an RSA temporary key in a non-export RSA key exchange ciphersuite. An OpenSSL server will accept a DH certificate for client authentication without the certificate verify message. OpenSSL accepts several non-DER-variations of certificate signature algorithm and signature encodings. OpenSSL also does not enforce a match between the signature algorithm between the signed and unsigned portions of the certificate. Bignum squaring (BN_sqr) may produce incorrect results on some platforms, including x86_64.