CVE-2014-3510

La función ssl3_send_client_key_exchange en s3_clnt.c en OpenSSL 0.9.8 anterior a 0.9.8zb, 1.0.0 anterior a 1.0.0n, y 1.0.1 anterior a 1.0.1i permite a servidores DTLS remotos causar una denegación de servicio (referencia a puntero nulo y caída de la aplicación del cliente) a través de un mensaje de negociación manipulado en conjunto con un suite de cifrado (1) anónimo DH o (2) anónimo ECDH.

A NULL pointer dereference flaw was found in the way OpenSSL performed a handshake when using the anonymous Diffie-Hellman (DH) key exchange. A malicious server could cause a DTLS client using OpenSSL to crash if that client had anonymous DH cipher suites enabled.

A flaw in OBJ_obj2txt may cause pretty printing functions such as X509_name_oneline, X509_name_print_ex et al. to leak some information from the stack. Applications may be affected if they echo pretty printing output to the attacker. OpenSSL SSL/TLS clients and servers themselves are not affected. If a multithreaded client connects to a malicious server using a resumed session and the server sends an ec point format extension it could write up to 255 bytes to freed memory. An attacker can force an error condition which causes openssl to crash whilst processing DTLS packets due to memory being freed twice. This can be exploited through a Denial of Service attack. An attacker can force openssl to consume large amounts of memory whilst processing DTLS handshake messages. This can be exploited through a Denial of Service attack. By sending carefully crafted DTLS packets an attacker could cause openssl to leak memory. This can be exploited through a Denial of Service attack. OpenSSL DTLS clients enabling anonymous DH ciphersuites are subject to a denial of service attack. A malicious server can crash the client with a null pointer dereference by specifying an anonymous DH ciphersuite and sending carefully crafted handshake messages. The updated packages have been upgraded to the 1.0.0n version where these security flaws has been fixed.