RHEL 6 : gnutls (RHSA-2015:1457)

Medium Nessus Plugin ID 84949


The remote Red Hat host is missing one or more security updates.


Updated gnutls packages that fix three security issues and one bug are now available for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Moderate security impact. Common Vulnerability Scoring System (CVSS) base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section.

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 :

* Previously, under certain circumstances, the certtool utility could generate X.509 certificates which contained a negative modulus.
Consequently, such certificates could have interoperation problems with the software using them. The bug has been fixed, and certtool no longer generates X.509 certificates containing a negative modulus.

Users of gnutls are advised to upgrade to these updated packages, which contain backported patches to correct these issues.


Update the affected packages.

See Also





Plugin Details

Severity: Medium

ID: 84949

File Name: redhat-RHSA-2015-1457.nasl

Version: $Revision: 2.2 $

Type: local

Agent: unix

Published: 2015/07/23

Modified: 2017/01/06

Dependencies: 12634

Risk Information

Risk Factor: Medium


Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:gnutls, p-cpe:/a:redhat:enterprise_linux:gnutls-debuginfo, p-cpe:/a:redhat:enterprise_linux:gnutls-devel, p-cpe:/a:redhat:enterprise_linux:gnutls-guile, p-cpe:/a:redhat:enterprise_linux:gnutls-utils, cpe:/o:redhat:enterprise_linux:6

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2015/07/22

Reference Information

CVE: CVE-2014-8155, CVE-2015-0282, CVE-2015-0294

BID: 73119, 73162, 73317

OSVDB: 118749, 119020, 119405

RHSA: 2015:1457