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Category:   Application (VPN)  >   GnuTLS Vendors:   Mozilla.org
(Red Hat Issues Fix for GnuTLS) Network Security Services Library Supports Certificates With Weak MD2 Hash Signatures
SecurityTracker Alert ID:  1023753
SecurityTracker URL:  http://securitytracker.com/id/1023753
CVE Reference:   CVE-2009-2409   (Links to External Site)
Date:  Mar 26 2010
Impact:   Modification of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Network Security Services. A remote user may be create certificates that appear to be valid for arbitrary sites. OpenSSL, GnuTLS, Mozilla Firefox, and other applications are affected.

A remote user that is able to create a certificate that has the same MD2 hash signature as a trusted Certificate Authority root certificate can issue valid SSL certificates for arbitrary sites.

Dan Kaminsky reported this vulnerability.

Impact:   A remote user may be able to issue valid SSL certificates for arbitrary sites in certain cases.
Solution:   Red Hat has issued a fix for GnuTLS.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2010-0166.html

Vendor URL:  www.mozilla.org/projects/security/pki/nss/ (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.
Jul 31 2009 Network Security Services Library Supports Certificates With Weak MD2 Hash Signatures



 Source Message Contents

Subject:  [RHSA-2010:0166-01] Moderate: gnutls security update

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

Synopsis:          Moderate: gnutls security update
Advisory ID:       RHSA-2010:0166-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0166.html
Issue date:        2010-03-25
CVE Names:         CVE-2009-2409 CVE-2009-3555 
=====================================================================

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 moderate
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).

A flaw was found in the way the TLS/SSL (Transport Layer Security/Secure
Sockets Layer) protocols handled session renegotiation. A man-in-the-middle
attacker could use this flaw to prefix arbitrary plain text to a client's
session (for example, an HTTPS connection to a website). This could force
the server to process an attacker's request as if authenticated using the
victim's credentials. This update addresses this flaw by implementing the
TLS Renegotiation Indication Extension, as defined in RFC 5746.
(CVE-2009-3555)

Refer to the following Knowledgebase article for additional details about
the CVE-2009-3555 flaw: http://kbase.redhat.com/faq/docs/DOC-20491

Dan Kaminsky found that browsers could accept certificates with MD2 hash
signatures, even though MD2 is no longer considered a cryptographically
strong algorithm. This could make it easier for an attacker to create a
malicious certificate that would be treated as trusted by a browser. GnuTLS
now disables the use of the MD2 algorithm inside signatures by default.
(CVE-2009-2409)

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
http://kbase.redhat.com/faq/docs/DOC-11259

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

510197 - CVE-2009-2409 deprecate MD2 in SSL cert validation (Kaminsky)
533125 - CVE-2009-3555 TLS: MITM attacks via session renegotiation

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_4.8.src.rpm

i386:
gnutls-1.4.1-3.el5_4.8.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.i386.rpm
gnutls-utils-1.4.1-3.el5_4.8.i386.rpm

x86_64:
gnutls-1.4.1-3.el5_4.8.i386.rpm
gnutls-1.4.1-3.el5_4.8.x86_64.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.x86_64.rpm
gnutls-utils-1.4.1-3.el5_4.8.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_4.8.src.rpm

i386:
gnutls-debuginfo-1.4.1-3.el5_4.8.i386.rpm
gnutls-devel-1.4.1-3.el5_4.8.i386.rpm

x86_64:
gnutls-debuginfo-1.4.1-3.el5_4.8.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.x86_64.rpm
gnutls-devel-1.4.1-3.el5_4.8.i386.rpm
gnutls-devel-1.4.1-3.el5_4.8.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_4.8.src.rpm

i386:
gnutls-1.4.1-3.el5_4.8.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.i386.rpm
gnutls-devel-1.4.1-3.el5_4.8.i386.rpm
gnutls-utils-1.4.1-3.el5_4.8.i386.rpm

ia64:
gnutls-1.4.1-3.el5_4.8.i386.rpm
gnutls-1.4.1-3.el5_4.8.ia64.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.ia64.rpm
gnutls-devel-1.4.1-3.el5_4.8.ia64.rpm
gnutls-utils-1.4.1-3.el5_4.8.ia64.rpm

ppc:
gnutls-1.4.1-3.el5_4.8.ppc.rpm
gnutls-1.4.1-3.el5_4.8.ppc64.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.ppc.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.ppc64.rpm
gnutls-devel-1.4.1-3.el5_4.8.ppc.rpm
gnutls-devel-1.4.1-3.el5_4.8.ppc64.rpm
gnutls-utils-1.4.1-3.el5_4.8.ppc.rpm

s390x:
gnutls-1.4.1-3.el5_4.8.s390.rpm
gnutls-1.4.1-3.el5_4.8.s390x.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.s390.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.s390x.rpm
gnutls-devel-1.4.1-3.el5_4.8.s390.rpm
gnutls-devel-1.4.1-3.el5_4.8.s390x.rpm
gnutls-utils-1.4.1-3.el5_4.8.s390x.rpm

x86_64:
gnutls-1.4.1-3.el5_4.8.i386.rpm
gnutls-1.4.1-3.el5_4.8.x86_64.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.i386.rpm
gnutls-debuginfo-1.4.1-3.el5_4.8.x86_64.rpm
gnutls-devel-1.4.1-3.el5_4.8.i386.rpm
gnutls-devel-1.4.1-3.el5_4.8.x86_64.rpm
gnutls-utils-1.4.1-3.el5_4.8.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:

https://www.redhat.com/security/data/cve/CVE-2009-2409.html
https://www.redhat.com/security/data/cve/CVE-2009-3555.html
http://www.redhat.com/security/updates/classification/#moderate
http://kbase.redhat.com/faq/docs/DOC-20491

8. Contact:

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

Copyright 2010 Red Hat, Inc.
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