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Category:   Application (VPN)  >   GnuTLS Vendors:   gnutls.org
(Red Hat Issues Fix) GnuTLS X.509 Certificate Chain Validation Bug Permits Man-in-the-Middle Attacks
SecurityTracker Alert ID:  1021168
SecurityTracker URL:  http://securitytracker.com/id/1021168
CVE Reference:   CVE-2008-4989   (Links to External Site)
Date:  Nov 11 2008
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.6.1
Description:   A vulnerability was reported in GnuTLS. A remote user that can conduct a man-in-the-middle attack can spoof valid certificates.

The libgnutls component does not properly validate X.509 certificate chains. A remote user with the ability to conduct a man-in-the-middle attack can cause GNU TLS clients to trust arbitrary sites.

The vulnerability resides in 'lib/x509/verify.c'.

Martin von Gagern reported this vulnerability.
Impact:   A remote user that can conduct a man-in-the-middle attack can spoof certificates for arbitrary sites.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2008-0982.html
Vendor URL:  www.gnu.org/software/gnutls/security.html (Links to External Site)
Cause:   Authentication error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 11 2008 GnuTLS X.509 Certificate Chain Validation Bug Permits Man-in-the-Middle Attacks


 Source Message Contents
Date:  Tue, 11 Nov 2008 13:28:48 -0500
Subject:  [RHSA-2008:0982-01] Moderate: gnutls security update


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

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

Synopsis:          Moderate: gnutls security update
Advisory ID:       RHSA-2008:0982-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2008-0982.html
Issue date:        2008-11-11
CVE Names:         CVE-2008-4989 
=====================================================================

1. Summary:

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

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

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

3. Description:

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

Martin von Gagern discovered a flaw in the way GnuTLS verified certificate
chains provided by a server. A malicious server could use this flaw to
spoof its identity by tricking client applications using the GnuTLS library
to trust invalid certificates. (CVE-2008-4989)

Users of GnuTLS are advised to upgrade to these updated packages, which
contain a backported patch that corrects this issue.

4. Solution:

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

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

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

470079 - CVE-2008-4989 gnutls: certificate chain verification flaw

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-1.4.1-3.el5_2.1.src.rpm

i386:
gnutls-1.4.1-3.el5_2.1.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.i386.rpm
gnutls-utils-1.4.1-3.el5_2.1.i386.rpm

x86_64:
gnutls-1.4.1-3.el5_2.1.i386.rpm
gnutls-1.4.1-3.el5_2.1.x86_64.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.x86_64.rpm
gnutls-utils-1.4.1-3.el5_2.1.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gnutls-1.4.1-3.el5_2.1.src.rpm

i386:
gnutls-debuginfo-1.4.1-3.el5_2.1.i386.rpm
gnutls-devel-1.4.1-3.el5_2.1.i386.rpm

x86_64:
gnutls-debuginfo-1.4.1-3.el5_2.1.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.x86_64.rpm
gnutls-devel-1.4.1-3.el5_2.1.i386.rpm
gnutls-devel-1.4.1-3.el5_2.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/gnutls-1.4.1-3.el5_2.1.src.rpm

i386:
gnutls-1.4.1-3.el5_2.1.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.i386.rpm
gnutls-devel-1.4.1-3.el5_2.1.i386.rpm
gnutls-utils-1.4.1-3.el5_2.1.i386.rpm

ia64:
gnutls-1.4.1-3.el5_2.1.i386.rpm
gnutls-1.4.1-3.el5_2.1.ia64.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.ia64.rpm
gnutls-devel-1.4.1-3.el5_2.1.ia64.rpm
gnutls-utils-1.4.1-3.el5_2.1.ia64.rpm

ppc:
gnutls-1.4.1-3.el5_2.1.ppc.rpm
gnutls-1.4.1-3.el5_2.1.ppc64.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.ppc.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.ppc64.rpm
gnutls-devel-1.4.1-3.el5_2.1.ppc.rpm
gnutls-devel-1.4.1-3.el5_2.1.ppc64.rpm
gnutls-utils-1.4.1-3.el5_2.1.ppc.rpm

s390x:
gnutls-1.4.1-3.el5_2.1.s390.rpm
gnutls-1.4.1-3.el5_2.1.s390x.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.s390.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.s390x.rpm
gnutls-devel-1.4.1-3.el5_2.1.s390.rpm
gnutls-devel-1.4.1-3.el5_2.1.s390x.rpm
gnutls-utils-1.4.1-3.el5_2.1.s390x.rpm

x86_64:
gnutls-1.4.1-3.el5_2.1.i386.rpm
gnutls-1.4.1-3.el5_2.1.x86_64.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_2.1.x86_64.rpm
gnutls-devel-1.4.1-3.el5_2.1.i386.rpm
gnutls-devel-1.4.1-3.el5_2.1.x86_64.rpm
gnutls-utils-1.4.1-3.el5_2.1.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://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4989
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2008 Red Hat, Inc.
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