Issued:

2015-07-22

Updated:

2015-07-22

RHSA-2015:1457 - Moderate: gnutls security and bug fix update

Synopsis

Moderate: gnutls security and bug fix update

Type/Severity

Security Advisory Moderate

Topic

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.

Description

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. (BZ#1036385)

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

Solution

Before applying this update, make sure all previously released errata relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

Updated Packages

• gnutls-guile-2.8.5-18.el6.i686.rpm
• gnutls-guile-2.8.5-18.el6.s390x.rpm
• gnutls-utils-2.8.5-18.el6.x86_64.rpm
• gnutls-2.8.5-18.el6.s390x.rpm
• gnutls-debuginfo-2.8.5-18.el6.s390.rpm
• gnutls-2.8.5-18.el6.x86_64.rpm
• gnutls-devel-2.8.5-18.el6.x86_64.rpm
• gnutls-2.8.5-18.el6.src.rpm
• gnutls-2.8.5-18.el6.s390.rpm
• gnutls-debuginfo-2.8.5-18.el6.ppc64.rpm
• gnutls-2.8.5-18.el6.i686.rpm
• gnutls-2.8.5-18.el6.ppc.rpm
• gnutls-debuginfo-2.8.5-18.el6.i686.rpm
• gnutls-guile-2.8.5-18.el6.ppc.rpm
• gnutls-guile-2.8.5-18.el6.ppc64.rpm
• gnutls-utils-2.8.5-18.el6.ppc64.rpm
• gnutls-utils-2.8.5-18.el6.s390x.rpm
• gnutls-guile-2.8.5-18.el6.s390.rpm
• gnutls-debuginfo-2.8.5-18.el6.ppc.rpm
• gnutls-debuginfo-2.8.5-18.el6.x86_64.rpm
• gnutls-devel-2.8.5-18.el6.ppc64.rpm
• gnutls-debuginfo-2.8.5-18.el6.s390x.rpm
• gnutls-guile-2.8.5-18.el6.x86_64.rpm
• gnutls-devel-2.8.5-18.el6.ppc.rpm
• gnutls-devel-2.8.5-18.el6.i686.rpm
• gnutls-2.8.5-18.el6.ppc64.rpm
• gnutls-devel-2.8.5-18.el6.s390x.rpm
• gnutls-utils-2.8.5-18.el6.i686.rpm
• gnutls-devel-2.8.5-18.el6.s390.rpm

Fixes

• This content is not included.BZ - 1036385
• This content is not included.BZ - 1194371
• This content is not included.BZ - 1196323
• This content is not included.BZ - 1197995

CVEs

• CVE-2014-8155
• CVE-2015-0282
• CVE-2015-0294

References

• https://access.redhat.com/security/updates/classification/#moderate

Additional information

• The Red Hat security contact is This content is not included.secalert@redhat.com. More contact details at Security Contacts and Procedures.
• Offline Security Data data is available for integration with other systems. See Offline Security Data API to get started.