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                   Red Hat Security Advisory

Synopsis:          Important: gnutls security update
Advisory ID:       RHSA-2006:0680-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2006-0680.html
Issue date:        2006-09-14
Updated on:        2006-09-14
Product:           Red Hat Enterprise Linux
CVE Names:         CVE-2006-4790 
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1. Summary:

Updated gnutls packages that fix a security issue are now available for Red
Hat Enterprise Linux 4.

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

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64

3. Problem description:

The GnuTLS Library provides support for cryptographic algorithms and
protocols such as TLS. GnuTLS includes libtasn1, a library developed for
ASN.1 structures management that includes DER encoding and decoding.

Daniel Bleichenbacher recently described an attack on PKCS #1 v1.5
signatures. Where an RSA key with exponent 3 is used it may be possible for
an attacker to forge a PKCS #1 v1.5 signature that would be incorrectly
verified by implementations that do not check for excess data in the RSA
exponentiation result of the signature.

The core GnuTLS team discovered that GnuTLS is vulnerable to a variant of
the Bleichenbacker attack. This issue affects applications that use GnuTLS
to verify X.509 certificates as well as other uses of PKCS #1 v1.5.
(CVE-2006-4790)

In Red Hat Enterprise Linux 4, the GnuTLS library is only used by the
Evolution client when connecting to an Exchange server or when publishing
calendar information to a WebDAV server.

Users are advised to upgrade to these updated packages, which contain a
backported patch from the GnuTLS maintainers to correct this issue.

4. Solution:

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

This update is available via Red Hat Network.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed (http://bugzilla.redhat.com/):

206411 - CVE-2006-4790 RSA forgery affects gnutls

6. RPMs required:

Red Hat Enterprise Linux AS version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/gnutls-1.0.20-3.2.3.src.rpm
60106ff0a4fcc6bdfab8d262c1157469  gnutls-1.0.20-3.2.3.src.rpm

i386:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
60cb9b56ffab6fc8ec9df1f53c82da51  gnutls-devel-1.0.20-3.2.3.i386.rpm

ia64:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
84cec28ca548482b2409eba04bc5cc2a  gnutls-1.0.20-3.2.3.ia64.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
a49fa92fae38882c930ec62c98f41b88  gnutls-debuginfo-1.0.20-3.2.3.ia64.rpm
fd378955aa68beb8b695f54a5b96e32a  gnutls-devel-1.0.20-3.2.3.ia64.rpm

ppc:
5fe6d74ce6a3cba718f73727c15da477  gnutls-1.0.20-3.2.3.ppc.rpm
d80d9c580e4f9fb2618d507ebcd04cd4  gnutls-1.0.20-3.2.3.ppc64.rpm
333733276d385a239998945576296d79  gnutls-debuginfo-1.0.20-3.2.3.ppc.rpm
3c38dd8f661acfd9aaff889437958905  gnutls-debuginfo-1.0.20-3.2.3.ppc64.rpm
38d15bbdbc6bfa0a42c59af2c4721800  gnutls-devel-1.0.20-3.2.3.ppc.rpm

s390:
0d492813efdd04c1857a070c3365b603  gnutls-1.0.20-3.2.3.s390.rpm
9d202406a60b67b6f737f41a77b766c3  gnutls-debuginfo-1.0.20-3.2.3.s390.rpm
48ee2a6d838bdb54a8965af9e2a4a2d5  gnutls-devel-1.0.20-3.2.3.s390.rpm

s390x:
0d492813efdd04c1857a070c3365b603  gnutls-1.0.20-3.2.3.s390.rpm
b2c8606d60365818d5e80d32ea654679  gnutls-1.0.20-3.2.3.s390x.rpm
9d202406a60b67b6f737f41a77b766c3  gnutls-debuginfo-1.0.20-3.2.3.s390.rpm
8037461d552b896fcffd895a447e46d1  gnutls-debuginfo-1.0.20-3.2.3.s390x.rpm
c9ea3c076c05e4c54ce9b85bfceb916d  gnutls-devel-1.0.20-3.2.3.s390x.rpm

x86_64:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
9f3f2b568ba75803f9d7b75385310877  gnutls-1.0.20-3.2.3.x86_64.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
79ee23a3f032fb2f04b6fa63d243849b  gnutls-debuginfo-1.0.20-3.2.3.x86_64.rpm
6917afed0d2c314879b52ce4138b47fc  gnutls-devel-1.0.20-3.2.3.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/gnutls-1.0.20-3.2.3.src.rpm
60106ff0a4fcc6bdfab8d262c1157469  gnutls-1.0.20-3.2.3.src.rpm

i386:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
60cb9b56ffab6fc8ec9df1f53c82da51  gnutls-devel-1.0.20-3.2.3.i386.rpm

x86_64:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
9f3f2b568ba75803f9d7b75385310877  gnutls-1.0.20-3.2.3.x86_64.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
79ee23a3f032fb2f04b6fa63d243849b  gnutls-debuginfo-1.0.20-3.2.3.x86_64.rpm
6917afed0d2c314879b52ce4138b47fc  gnutls-devel-1.0.20-3.2.3.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/gnutls-1.0.20-3.2.3.src.rpm
60106ff0a4fcc6bdfab8d262c1157469  gnutls-1.0.20-3.2.3.src.rpm

i386:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
60cb9b56ffab6fc8ec9df1f53c82da51  gnutls-devel-1.0.20-3.2.3.i386.rpm

ia64:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
84cec28ca548482b2409eba04bc5cc2a  gnutls-1.0.20-3.2.3.ia64.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
a49fa92fae38882c930ec62c98f41b88  gnutls-debuginfo-1.0.20-3.2.3.ia64.rpm
fd378955aa68beb8b695f54a5b96e32a  gnutls-devel-1.0.20-3.2.3.ia64.rpm

x86_64:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
9f3f2b568ba75803f9d7b75385310877  gnutls-1.0.20-3.2.3.x86_64.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
79ee23a3f032fb2f04b6fa63d243849b  gnutls-debuginfo-1.0.20-3.2.3.x86_64.rpm
6917afed0d2c314879b52ce4138b47fc  gnutls-devel-1.0.20-3.2.3.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/gnutls-1.0.20-3.2.3.src.rpm
60106ff0a4fcc6bdfab8d262c1157469  gnutls-1.0.20-3.2.3.src.rpm

i386:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
60cb9b56ffab6fc8ec9df1f53c82da51  gnutls-devel-1.0.20-3.2.3.i386.rpm

ia64:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
84cec28ca548482b2409eba04bc5cc2a  gnutls-1.0.20-3.2.3.ia64.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
a49fa92fae38882c930ec62c98f41b88  gnutls-debuginfo-1.0.20-3.2.3.ia64.rpm
fd378955aa68beb8b695f54a5b96e32a  gnutls-devel-1.0.20-3.2.3.ia64.rpm

x86_64:
f749e542a24f251e6dc2603c9cce1402  gnutls-1.0.20-3.2.3.i386.rpm
9f3f2b568ba75803f9d7b75385310877  gnutls-1.0.20-3.2.3.x86_64.rpm
91a8b01e402bc0a8c6a298b504f1f89d  gnutls-debuginfo-1.0.20-3.2.3.i386.rpm
79ee23a3f032fb2f04b6fa63d243849b  gnutls-debuginfo-1.0.20-3.2.3.x86_64.rpm
6917afed0d2c314879b52ce4138b47fc  gnutls-devel-1.0.20-3.2.3.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-2006-4790
http://www.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2006 Red Hat, Inc.
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