CentOS Errata and Security Advisory CESA-2015:1457
The GnuTLS library provides support for cryptographic algorithms and for protocols such as Transport Layer Security (TLS).
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. (CVE-2014-8155)
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. (CVE-2015-0282)
It was discovered that GnuTLS did not check if all sections of X.509 certificates indicate the same signature algorithm. This flaw, in combination with a different flaw, could possibly lead to a bypass of the certificate signature check. (CVE-2015-0294)
The CVE-2014-8155 issue was discovered by Marcel Kolaja of Red Hat. The CVE-2015-0282 and CVE-2015-0294 issues were discovered by Nikos Mavrogiannopoulos of the Red Hat Security Technologies Team.
This update also fixes the following bug:
Users of gnutls are advised to upgrade to these updated packages, which contain backported patches to correct these issues.
Merged security bulletin from advisories: http://lists.centos.org/pipermail/centos-cr-announce/2015-July/008137.html
Affected packages: gnutls gnutls-devel gnutls-guile gnutls-utils
Upstream details at: https://rhn.redhat.com/errata/RHSA-2015-1457.html