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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:  1026856
SecurityTracker URL:  http://securitytracker.com/id/1026856
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  
Version(s): 2.x prior to 2.12.14; 3.0 prior to 3.0.7
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-2012-0428.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:  5

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-2012:0428-01] Important: gnutls security update

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

Synopsis:          Important: gnutls security update
Advisory ID:       RHSA-2012:0428-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-0428.html
Issue date:        2012-03-27
CVE Names:         CVE-2011-4128 CVE-2012-1569 CVE-2012-1573 
=====================================================================

1. Summary:

Updated gnutls packages that fix three 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). GnuTLS includes libtasn1,
a library developed for ASN.1 (Abstract Syntax Notation One) structures
management that includes DER (Distinguished Encoding Rules) encoding and
decoding.

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 flaw was found in the way libtasn1 decoded DER data. An attacker could
create a carefully-crafted X.509 certificate that, when parsed by an
application that uses GnuTLS, could cause the application to crash.
(CVE-2012-1569)

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 and CVE-2012-1569.

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)
804920 - CVE-2012-1569 libtasn1: DER decoding buffer overflow (GNUTLS-SA-2012-3, MU-201202-02)
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. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gnutls-1.4.1-7.el5_8.2.src.rpm

i386:
gnutls-1.4.1-7.el5_8.2.i386.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.i386.rpm
gnutls-utils-1.4.1-7.el5_8.2.i386.rpm

x86_64:
gnutls-1.4.1-7.el5_8.2.i386.rpm
gnutls-1.4.1-7.el5_8.2.x86_64.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.i386.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.x86_64.rpm
gnutls-utils-1.4.1-7.el5_8.2.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gnutls-1.4.1-7.el5_8.2.src.rpm

i386:
gnutls-debuginfo-1.4.1-7.el5_8.2.i386.rpm
gnutls-devel-1.4.1-7.el5_8.2.i386.rpm

x86_64:
gnutls-debuginfo-1.4.1-7.el5_8.2.i386.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.x86_64.rpm
gnutls-devel-1.4.1-7.el5_8.2.i386.rpm
gnutls-devel-1.4.1-7.el5_8.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/gnutls-1.4.1-7.el5_8.2.src.rpm

i386:
gnutls-1.4.1-7.el5_8.2.i386.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.i386.rpm
gnutls-devel-1.4.1-7.el5_8.2.i386.rpm
gnutls-utils-1.4.1-7.el5_8.2.i386.rpm

ia64:
gnutls-1.4.1-7.el5_8.2.i386.rpm
gnutls-1.4.1-7.el5_8.2.ia64.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.i386.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.ia64.rpm
gnutls-devel-1.4.1-7.el5_8.2.ia64.rpm
gnutls-utils-1.4.1-7.el5_8.2.ia64.rpm

ppc:
gnutls-1.4.1-7.el5_8.2.ppc.rpm
gnutls-1.4.1-7.el5_8.2.ppc64.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.ppc.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.ppc64.rpm
gnutls-devel-1.4.1-7.el5_8.2.ppc.rpm
gnutls-devel-1.4.1-7.el5_8.2.ppc64.rpm
gnutls-utils-1.4.1-7.el5_8.2.ppc.rpm

s390x:
gnutls-1.4.1-7.el5_8.2.s390.rpm
gnutls-1.4.1-7.el5_8.2.s390x.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.s390.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.s390x.rpm
gnutls-devel-1.4.1-7.el5_8.2.s390.rpm
gnutls-devel-1.4.1-7.el5_8.2.s390x.rpm
gnutls-utils-1.4.1-7.el5_8.2.s390x.rpm

x86_64:
gnutls-1.4.1-7.el5_8.2.i386.rpm
gnutls-1.4.1-7.el5_8.2.x86_64.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.i386.rpm
gnutls-debuginfo-1.4.1-7.el5_8.2.x86_64.rpm
gnutls-devel-1.4.1-7.el5_8.2.i386.rpm
gnutls-devel-1.4.1-7.el5_8.2.x86_64.rpm
gnutls-utils-1.4.1-7.el5_8.2.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-2012-1569.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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