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Category:   Application (VPN)  >   GnuTLS Vendors:   gnutls.org
(Red Hat Issues Fix) GnuTLS Buffer Overflow in gnutls_session_get_data() Lets Remote Users Deny Service
SecurityTracker Alert ID:  1026853
SecurityTracker URL:  http://securitytracker.com/id/1026853
CVE Reference:   CVE-2011-4128   (Links to External Site)
Date:  Mar 28 2012
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in GnuTLS. A remote user can cause denial of service conditions.

A remote server can send specially crafted data to a connected client to trigger a buffer overflow in gnutls_session_get_data() and cause the target client to crash.

Alban Crequy reported this vulnerability.

Impact:   A remote server can cause the target client to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-0429.html

Vendor URL:  www.gnu.org/software/gnutls/security.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Nov 10 2011 GnuTLS Buffer Overflow in gnutls_session_get_data() Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2012:0429-01] Important: gnutls security update

-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: gnutls security update
Advisory ID:       RHSA-2012:0429-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-0429.html
Issue date:        2012-03-27
CVE Names:         CVE-2011-4128 CVE-2012-1573 
=====================================================================

1. Summary:

Updated gnutls packages that fix two security issues are now available for
Red Hat Enterprise Linux 6.

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:

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

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

A flaw was found in the way GnuTLS decrypted malformed TLS records. This
could cause a TLS/SSL client or server to crash when processing a
specially-crafted TLS record from a remote TLS/SSL connection peer.
(CVE-2012-1573)

A boundary error was found in the gnutls_session_get_data() function. A
malicious TLS/SSL server could use this flaw to crash a TLS/SSL client or,
possibly, execute arbitrary code as the client, if the client passed a
fixed-sized buffer to gnutls_session_get_data() before checking the real
size of the session data provided by the server. (CVE-2011-4128)

Red Hat would like to thank Matthew Hall of Mu Dynamics for reporting
CVE-2012-1573.

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

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/knowledge/articles/11258

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

752308 - CVE-2011-4128 gnutls: buffer overflow in gnutls_session_get_data() (GNUTLS-SA-2011-2)
805432 - CVE-2012-1573 gnutls: TLS record handling issue (GNUTLS-SA-2012-2, MU-201202-01)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/gnutls-2.8.5-4.el6_2.2.src.rpm

i386:
gnutls-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-utils-2.8.5-4.el6_2.2.i686.rpm

x86_64:
gnutls-2.8.5-4.el6_2.2.i686.rpm
gnutls-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-utils-2.8.5-4.el6_2.2.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/gnutls-2.8.5-4.el6_2.2.src.rpm

i386:
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-devel-2.8.5-4.el6_2.2.i686.rpm
gnutls-guile-2.8.5-4.el6_2.2.i686.rpm

x86_64:
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-devel-2.8.5-4.el6_2.2.i686.rpm
gnutls-devel-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-guile-2.8.5-4.el6_2.2.i686.rpm
gnutls-guile-2.8.5-4.el6_2.2.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/gnutls-2.8.5-4.el6_2.2.src.rpm

x86_64:
gnutls-2.8.5-4.el6_2.2.i686.rpm
gnutls-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-utils-2.8.5-4.el6_2.2.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/gnutls-2.8.5-4.el6_2.2.src.rpm

x86_64:
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-devel-2.8.5-4.el6_2.2.i686.rpm
gnutls-devel-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-guile-2.8.5-4.el6_2.2.i686.rpm
gnutls-guile-2.8.5-4.el6_2.2.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/gnutls-2.8.5-4.el6_2.2.src.rpm

i386:
gnutls-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-devel-2.8.5-4.el6_2.2.i686.rpm
gnutls-utils-2.8.5-4.el6_2.2.i686.rpm

ppc64:
gnutls-2.8.5-4.el6_2.2.ppc.rpm
gnutls-2.8.5-4.el6_2.2.ppc64.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.ppc.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.ppc64.rpm
gnutls-devel-2.8.5-4.el6_2.2.ppc.rpm
gnutls-devel-2.8.5-4.el6_2.2.ppc64.rpm
gnutls-utils-2.8.5-4.el6_2.2.ppc64.rpm

s390x:
gnutls-2.8.5-4.el6_2.2.s390.rpm
gnutls-2.8.5-4.el6_2.2.s390x.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.s390.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.s390x.rpm
gnutls-devel-2.8.5-4.el6_2.2.s390.rpm
gnutls-devel-2.8.5-4.el6_2.2.s390x.rpm
gnutls-utils-2.8.5-4.el6_2.2.s390x.rpm

x86_64:
gnutls-2.8.5-4.el6_2.2.i686.rpm
gnutls-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-devel-2.8.5-4.el6_2.2.i686.rpm
gnutls-devel-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-utils-2.8.5-4.el6_2.2.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/gnutls-2.8.5-4.el6_2.2.src.rpm

i386:
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-guile-2.8.5-4.el6_2.2.i686.rpm

ppc64:
gnutls-debuginfo-2.8.5-4.el6_2.2.ppc.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.ppc64.rpm
gnutls-guile-2.8.5-4.el6_2.2.ppc.rpm
gnutls-guile-2.8.5-4.el6_2.2.ppc64.rpm

s390x:
gnutls-debuginfo-2.8.5-4.el6_2.2.s390.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.s390x.rpm
gnutls-guile-2.8.5-4.el6_2.2.s390.rpm
gnutls-guile-2.8.5-4.el6_2.2.s390x.rpm

x86_64:
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-guile-2.8.5-4.el6_2.2.i686.rpm
gnutls-guile-2.8.5-4.el6_2.2.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/gnutls-2.8.5-4.el6_2.2.src.rpm

i386:
gnutls-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-devel-2.8.5-4.el6_2.2.i686.rpm
gnutls-utils-2.8.5-4.el6_2.2.i686.rpm

x86_64:
gnutls-2.8.5-4.el6_2.2.i686.rpm
gnutls-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-devel-2.8.5-4.el6_2.2.i686.rpm
gnutls-devel-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-utils-2.8.5-4.el6_2.2.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/gnutls-2.8.5-4.el6_2.2.src.rpm

i386:
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-guile-2.8.5-4.el6_2.2.i686.rpm

x86_64:
gnutls-debuginfo-2.8.5-4.el6_2.2.i686.rpm
gnutls-debuginfo-2.8.5-4.el6_2.2.x86_64.rpm
gnutls-guile-2.8.5-4.el6_2.2.i686.rpm
gnutls-guile-2.8.5-4.el6_2.2.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-2011-4128.html
https://www.redhat.com/security/data/cve/CVE-2012-1573.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 2012 Red Hat, Inc.
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