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Category:   Application (VPN)  >   GnuTLS Vendors:   gnutls.org
(Red Hat Issues Fix) GnuTLS TLS/DTLS CBC Mode Oracle Padding Lets Remote Users Recover Plaintext
SecurityTracker Alert ID:  1028241
SecurityTracker URL:  http://securitytracker.com/id/1028241
CVE Reference:   CVE-2013-1619   (Links to External Site)
Date:  Mar 4 2013
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  Exploit Included:  Yes  
Version(s): prior to versions 2.12.23, 3.0.28, 3.1.7
Description:   A vulnerability was reported in GnuTLS. A remote user can recover plaintext in certain cases.

A user with low latency access to the target system's network can send specially crafted encrypted data and monitor the response timing to determine the plaintext contents of the data. For certain message lengths where the HMAC-SHA1 MAC algorithm is used, TLS messages containing at least two bytes of correct padding will be processed slightly faster than TLS messages containing one byte of correct padding or padding that is incorrectly formatted. By analyzing the timing variations over a large number of connections, the original plaintext can be determined.

This attack is known as the 'Lucky Thirteen' attack.

The vulnerability resides in the TLS/DTLS protocol specification.

The original advisory is available at:

http://www.isg.rhul.ac.uk/tls/

Nadhem J. AlFardan and Kenneth G. Paterson of the Information Security Group Royal Holloway, University of London, reported this vulnerability.

Impact:   A remote user can recover plaintext.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2013-0588.html

Vendor URL:  www.gnutls.org/security.html#GNUTLS-SA-2013-1 (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5, 6

Message History:   This archive entry is a follow-up to the message listed below.
Feb 6 2013 GnuTLS TLS/DTLS CBC Mode Oracle Padding Lets Remote Users Recover Plaintext



 Source Message Contents

Subject:  [RHSA-2013:0588-01] Moderate: gnutls security update

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

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

Synopsis:          Moderate: gnutls security update
Advisory ID:       RHSA-2013:0588-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2013-0588.html
Issue date:        2013-03-04
CVE Names:         CVE-2013-1619 
=====================================================================

1. Summary:

Updated gnutls packages that fix one security issue are now available for
Red Hat Enterprise Linux 5 and 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link 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
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).

It was discovered that GnuTLS leaked timing information when decrypting
TLS/SSL protocol encrypted records when CBC-mode cipher suites were used.
A remote attacker could possibly use this flaw to retrieve plain text from
the encrypted packets by using a TLS/SSL server as a padding oracle.
(CVE-2013-1619)

Users of GnuTLS are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. 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/):

908238 - CVE-2013-1619 gnutls: TLS CBC padding timing attack (lucky-13)

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-1.4.1-10.el5_9.1.src.rpm

i386:
gnutls-1.4.1-10.el5_9.1.i386.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.i386.rpm
gnutls-utils-1.4.1-10.el5_9.1.i386.rpm

x86_64:
gnutls-1.4.1-10.el5_9.1.i386.rpm
gnutls-1.4.1-10.el5_9.1.x86_64.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.i386.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.x86_64.rpm
gnutls-utils-1.4.1-10.el5_9.1.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gnutls-1.4.1-10.el5_9.1.src.rpm

i386:
gnutls-debuginfo-1.4.1-10.el5_9.1.i386.rpm
gnutls-devel-1.4.1-10.el5_9.1.i386.rpm

x86_64:
gnutls-debuginfo-1.4.1-10.el5_9.1.i386.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.x86_64.rpm
gnutls-devel-1.4.1-10.el5_9.1.i386.rpm
gnutls-devel-1.4.1-10.el5_9.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/gnutls-1.4.1-10.el5_9.1.src.rpm

i386:
gnutls-1.4.1-10.el5_9.1.i386.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.i386.rpm
gnutls-devel-1.4.1-10.el5_9.1.i386.rpm
gnutls-utils-1.4.1-10.el5_9.1.i386.rpm

ia64:
gnutls-1.4.1-10.el5_9.1.i386.rpm
gnutls-1.4.1-10.el5_9.1.ia64.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.i386.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.ia64.rpm
gnutls-devel-1.4.1-10.el5_9.1.ia64.rpm
gnutls-utils-1.4.1-10.el5_9.1.ia64.rpm

ppc:
gnutls-1.4.1-10.el5_9.1.ppc.rpm
gnutls-1.4.1-10.el5_9.1.ppc64.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.ppc.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.ppc64.rpm
gnutls-devel-1.4.1-10.el5_9.1.ppc.rpm
gnutls-devel-1.4.1-10.el5_9.1.ppc64.rpm
gnutls-utils-1.4.1-10.el5_9.1.ppc.rpm

s390x:
gnutls-1.4.1-10.el5_9.1.s390.rpm
gnutls-1.4.1-10.el5_9.1.s390x.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.s390.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.s390x.rpm
gnutls-devel-1.4.1-10.el5_9.1.s390.rpm
gnutls-devel-1.4.1-10.el5_9.1.s390x.rpm
gnutls-utils-1.4.1-10.el5_9.1.s390x.rpm

x86_64:
gnutls-1.4.1-10.el5_9.1.i386.rpm
gnutls-1.4.1-10.el5_9.1.x86_64.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.i386.rpm
gnutls-debuginfo-1.4.1-10.el5_9.1.x86_64.rpm
gnutls-devel-1.4.1-10.el5_9.1.i386.rpm
gnutls-devel-1.4.1-10.el5_9.1.x86_64.rpm
gnutls-utils-1.4.1-10.el5_9.1.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/gnutls-2.8.5-10.el6_4.1.src.rpm

i386:
gnutls-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-utils-2.8.5-10.el6_4.1.i686.rpm

x86_64:
gnutls-2.8.5-10.el6_4.1.i686.rpm
gnutls-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-utils-2.8.5-10.el6_4.1.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-2.8.5-10.el6_4.1.src.rpm

i386:
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-devel-2.8.5-10.el6_4.1.i686.rpm
gnutls-guile-2.8.5-10.el6_4.1.i686.rpm

x86_64:
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-devel-2.8.5-10.el6_4.1.i686.rpm
gnutls-devel-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-guile-2.8.5-10.el6_4.1.i686.rpm
gnutls-guile-2.8.5-10.el6_4.1.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-2.8.5-10.el6_4.1.src.rpm

x86_64:
gnutls-2.8.5-10.el6_4.1.i686.rpm
gnutls-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-utils-2.8.5-10.el6_4.1.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-2.8.5-10.el6_4.1.src.rpm

x86_64:
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-devel-2.8.5-10.el6_4.1.i686.rpm
gnutls-devel-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-guile-2.8.5-10.el6_4.1.i686.rpm
gnutls-guile-2.8.5-10.el6_4.1.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/gnutls-2.8.5-10.el6_4.1.src.rpm

i386:
gnutls-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-devel-2.8.5-10.el6_4.1.i686.rpm
gnutls-utils-2.8.5-10.el6_4.1.i686.rpm

ppc64:
gnutls-2.8.5-10.el6_4.1.ppc.rpm
gnutls-2.8.5-10.el6_4.1.ppc64.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.ppc.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.ppc64.rpm
gnutls-devel-2.8.5-10.el6_4.1.ppc.rpm
gnutls-devel-2.8.5-10.el6_4.1.ppc64.rpm
gnutls-utils-2.8.5-10.el6_4.1.ppc64.rpm

s390x:
gnutls-2.8.5-10.el6_4.1.s390.rpm
gnutls-2.8.5-10.el6_4.1.s390x.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.s390.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.s390x.rpm
gnutls-devel-2.8.5-10.el6_4.1.s390.rpm
gnutls-devel-2.8.5-10.el6_4.1.s390x.rpm
gnutls-utils-2.8.5-10.el6_4.1.s390x.rpm

x86_64:
gnutls-2.8.5-10.el6_4.1.i686.rpm
gnutls-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-devel-2.8.5-10.el6_4.1.i686.rpm
gnutls-devel-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-utils-2.8.5-10.el6_4.1.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-2.8.5-10.el6_4.1.src.rpm

i386:
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-guile-2.8.5-10.el6_4.1.i686.rpm

ppc64:
gnutls-debuginfo-2.8.5-10.el6_4.1.ppc.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.ppc64.rpm
gnutls-guile-2.8.5-10.el6_4.1.ppc.rpm
gnutls-guile-2.8.5-10.el6_4.1.ppc64.rpm

s390x:
gnutls-debuginfo-2.8.5-10.el6_4.1.s390.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.s390x.rpm
gnutls-guile-2.8.5-10.el6_4.1.s390.rpm
gnutls-guile-2.8.5-10.el6_4.1.s390x.rpm

x86_64:
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-guile-2.8.5-10.el6_4.1.i686.rpm
gnutls-guile-2.8.5-10.el6_4.1.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/gnutls-2.8.5-10.el6_4.1.src.rpm

i386:
gnutls-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-devel-2.8.5-10.el6_4.1.i686.rpm
gnutls-utils-2.8.5-10.el6_4.1.i686.rpm

x86_64:
gnutls-2.8.5-10.el6_4.1.i686.rpm
gnutls-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-devel-2.8.5-10.el6_4.1.i686.rpm
gnutls-devel-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-utils-2.8.5-10.el6_4.1.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-2.8.5-10.el6_4.1.src.rpm

i386:
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-guile-2.8.5-10.el6_4.1.i686.rpm

x86_64:
gnutls-debuginfo-2.8.5-10.el6_4.1.i686.rpm
gnutls-debuginfo-2.8.5-10.el6_4.1.x86_64.rpm
gnutls-guile-2.8.5-10.el6_4.1.i686.rpm
gnutls-guile-2.8.5-10.el6_4.1.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://access.redhat.com/security/team/key/#package

7. References:

https://www.redhat.com/security/data/cve/CVE-2013-1619.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2013 Red Hat, Inc.
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