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Category:   Application (VPN)  >   GnuTLS Vendors:   gnutls.org
(Red Hat Issues Fix) GnuTLS Certificate Processing Flaw May Let Remote Users Bypass Certificate Validation
SecurityTracker Alert ID:  1029857
SecurityTracker URL:  http://securitytracker.com/id/1029857
CVE Reference:   CVE-2014-0092   (Links to External Site)
Date:  Mar 3 2014
Impact:   Disclosure of user information, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to versions 3.1.22, 3.2.12
Description:   A vulnerability was reported in GnuTLS. A remote user can bypass certificate validation in certain cases.

A remote user can supply a specially crafted X.509 certificate that will cause GnuTLS to incorrectly report a successful verification.

Nikos Mavrogiannopoulos of the Red Hat Security Technologies Team reported this vulnerability.

Impact:   A remote user can bypass certificate validation in certain cases.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2014-0247.html

Vendor URL:  gnutls.org/security.html#GNUTLS-SA-2014-2 (Links to External Site)
Cause:   Authentication error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Mar 3 2014 GnuTLS Certificate Processing Flaw May Let Remote Users Bypass Certificate Validation



 Source Message Contents

Subject:  [RHSA-2014:0247-01] Important: gnutls security update

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: gnutls security update
Advisory ID:       RHSA-2014:0247-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-0247.html
Issue date:        2014-03-03
CVE Names:         CVE-2009-5138 CVE-2014-0092 
=====================================================================

1. Summary:

Updated gnutls packages that fix two security issues are now available for
Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having
Important 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.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

3. Description:

The GnuTLS library provides support for cryptographic algorithms and for
protocols such as Transport Layer Security (TLS).

It was discovered that GnuTLS did not correctly handle certain errors that
could occur during the verification of an X.509 certificate, causing it to
incorrectly report a successful verification. An attacker could use this
flaw to create a specially crafted certificate that could be accepted by
GnuTLS as valid for a site chosen by the attacker. (CVE-2014-0092)

A flaw was found in the way GnuTLS handled version 1 X.509 certificates.
An attacker able to obtain a version 1 certificate from a trusted
certificate authority could use this flaw to issue certificates for other
sites that would be accepted by GnuTLS as valid. (CVE-2009-5138)

The CVE-2014-0092 issue was discovered by Nikos Mavrogiannopoulos of the
Red Hat Security Technologies Team.

Users of GnuTLS are advised to upgrade to these updated packages, which
correct these issues. For the update to take effect, all applications
linked to the GnuTLS library must be restarted.

4. Solution:

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

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1069301 - CVE-2009-5138 gnutls: incorrect handling of V1 intermediate certificates
1069865 - CVE-2014-0092 gnutls: incorrect error handling in certificate verification (GNUTLS-SA-2014-2)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gnutls-1.4.1-14.el5_10.src.rpm

i386:
gnutls-1.4.1-14.el5_10.i386.rpm
gnutls-debuginfo-1.4.1-14.el5_10.i386.rpm
gnutls-utils-1.4.1-14.el5_10.i386.rpm

x86_64:
gnutls-1.4.1-14.el5_10.i386.rpm
gnutls-1.4.1-14.el5_10.x86_64.rpm
gnutls-debuginfo-1.4.1-14.el5_10.i386.rpm
gnutls-debuginfo-1.4.1-14.el5_10.x86_64.rpm
gnutls-utils-1.4.1-14.el5_10.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gnutls-1.4.1-14.el5_10.src.rpm

i386:
gnutls-debuginfo-1.4.1-14.el5_10.i386.rpm
gnutls-devel-1.4.1-14.el5_10.i386.rpm

x86_64:
gnutls-debuginfo-1.4.1-14.el5_10.i386.rpm
gnutls-debuginfo-1.4.1-14.el5_10.x86_64.rpm
gnutls-devel-1.4.1-14.el5_10.i386.rpm
gnutls-devel-1.4.1-14.el5_10.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/gnutls-1.4.1-14.el5_10.src.rpm

i386:
gnutls-1.4.1-14.el5_10.i386.rpm
gnutls-debuginfo-1.4.1-14.el5_10.i386.rpm
gnutls-devel-1.4.1-14.el5_10.i386.rpm
gnutls-utils-1.4.1-14.el5_10.i386.rpm

ia64:
gnutls-1.4.1-14.el5_10.i386.rpm
gnutls-1.4.1-14.el5_10.ia64.rpm
gnutls-debuginfo-1.4.1-14.el5_10.i386.rpm
gnutls-debuginfo-1.4.1-14.el5_10.ia64.rpm
gnutls-devel-1.4.1-14.el5_10.ia64.rpm
gnutls-utils-1.4.1-14.el5_10.ia64.rpm

ppc:
gnutls-1.4.1-14.el5_10.ppc.rpm
gnutls-1.4.1-14.el5_10.ppc64.rpm
gnutls-debuginfo-1.4.1-14.el5_10.ppc.rpm
gnutls-debuginfo-1.4.1-14.el5_10.ppc64.rpm
gnutls-devel-1.4.1-14.el5_10.ppc.rpm
gnutls-devel-1.4.1-14.el5_10.ppc64.rpm
gnutls-utils-1.4.1-14.el5_10.ppc.rpm

s390x:
gnutls-1.4.1-14.el5_10.s390.rpm
gnutls-1.4.1-14.el5_10.s390x.rpm
gnutls-debuginfo-1.4.1-14.el5_10.s390.rpm
gnutls-debuginfo-1.4.1-14.el5_10.s390x.rpm
gnutls-devel-1.4.1-14.el5_10.s390.rpm
gnutls-devel-1.4.1-14.el5_10.s390x.rpm
gnutls-utils-1.4.1-14.el5_10.s390x.rpm

x86_64:
gnutls-1.4.1-14.el5_10.i386.rpm
gnutls-1.4.1-14.el5_10.x86_64.rpm
gnutls-debuginfo-1.4.1-14.el5_10.i386.rpm
gnutls-debuginfo-1.4.1-14.el5_10.x86_64.rpm
gnutls-devel-1.4.1-14.el5_10.i386.rpm
gnutls-devel-1.4.1-14.el5_10.x86_64.rpm
gnutls-utils-1.4.1-14.el5_10.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2009-5138.html
https://www.redhat.com/security/data/cve/CVE-2014-0092.html
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2014 Red Hat, Inc.
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