CVE-2014-3506

d1_both.c en la implementación DTLS 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 atacantes remotos causar una denegación de servicio (consumo de memoria) a través de mensajes de negociación DTLS manipulados que provocan reservas de memoria correspondientes con valores de longitud grandes.

A flaw was discovered in the way OpenSSL handled DTLS packets. A remote attacker could use this flaw to cause a DTLS server or client using OpenSSL to crash or use excessive amounts of memory.

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.