CVE-2015-0282

GnuTLS anterior a 3.1.0 no verifica que el algoritmo de firmas RSA PKCS #1 coincide con el algoritmo de firmas en el certificado, lo que permite a atacantes remotos realizar ataques de degradación a través de vectores no especificados.

It was found that GnuTLS did not verify whether a hashing algorithm listed in a signature matched the hashing algorithm listed in the certificate. An attacker could create a certificate that used a different hashing algorithm than it claimed, possibly causing GnuTLS to use an insecure, disallowed hashing algorithm during certificate verification.

The GnuTLS library provides support for cryptographic algorithms and for protocols such as Transport Layer Security. It was found that GnuTLS did not check activation and expiration dates of CA certificates. This could cause an application using GnuTLS to incorrectly accept a certificate as valid when its issuing CA is already expired. It was found that GnuTLS did not verify whether a hashing algorithm listed in a signature matched the hashing algorithm listed in the certificate. An attacker could create a certificate that used a different hashing algorithm than it claimed, possibly causing GnuTLS to use an insecure, disallowed hashing algorithm during certificate verification.