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                   Red Hat Security Advisory

Synopsis:          Important: gnupg security update
Advisory ID:       RHSA-2006:0266-01
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2006-0266.html
Issue date:        2006-03-15
Updated on:        2006-03-15
Product:           Red Hat Enterprise Linux
CVE Names:         CVE-2006-0049 CVE-2006-0455
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1. Summary:

An updated GnuPG package that fixes signature verification flaws as well as
minor bugs is now available.

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 (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64
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:

GnuPG is a utility for encrypting data and creating digital signatures.

Tavis Ormandy discovered a bug in the way GnuPG verifies cryptographically
signed data with detached signatures. It is possible for an attacker to
construct a cryptographically signed message which could appear to come
from a third party.  When a victim processes a GnuPG message with a
malformed detached signature, GnuPG ignores the malformed signature,
processes and outputs the signed data, and exits with status 0, just as it
would if the signature had been valid.  In this case, GnuPG's exit status
would not indicate that no signature verification had taken place. This
issue would primarily be of concern when processing GnuPG results via an
automated script. The Common Vulnerabilities and Exposures project assigned
the name CVE-2006-0455 to this issue.

Tavis Ormandy also discovered a bug in the way GnuPG verifies
cryptographically signed data with inline signatures. It is possible for an
attacker to inject unsigned data into a signed message in such a way that
when a victim processes the message to recover the data, the unsigned data
is output along with the signed data, gaining the appearance of having been
signed.  This issue is mitigated in the GnuPG shipped with Red Hat
Enterprise Linux as the --ignore-crc-error option must be passed to the gpg
executable for this attack to be successful. The Common Vulnerabilities and
Exposures project assigned the name CVE-2006-0049 to this issue.

Please note that neither of these issues affect the way RPM or up2date
verify RPM package files, nor is RPM vulnerable to either of these issues.

All users of GnuPG are advised to upgrade to this updated package, which
contains backported patches to correct these issues.

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/):

167392 - initial gpg run doesn't create .gnupg/secring.gpg
179506 - RHEL3, gnupg-1.2.1-10, gpg: Creates corrupt files (probably 2GB problem)
183484 - CVE-2006-0455 gpg will quietly exit when attempting to verify a malformed message
184556 - CVE-2006-0049 Gnupg incorrect malformed message verification


6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/gnupg-1.0.7-16.src.rpm
d15956e38c9d217ac93f5ed0cd5ce4f3  gnupg-1.0.7-16.src.rpm

i386:
cfcc3babbfc6f972dabbbac06e685f7d  gnupg-1.0.7-16.i386.rpm

ia64:
8c1dddef36a9e45e9ae1444b82e28bea  gnupg-1.0.7-16.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/gnupg-1.0.7-16.src.rpm
d15956e38c9d217ac93f5ed0cd5ce4f3  gnupg-1.0.7-16.src.rpm

ia64:
8c1dddef36a9e45e9ae1444b82e28bea  gnupg-1.0.7-16.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/gnupg-1.0.7-16.src.rpm
d15956e38c9d217ac93f5ed0cd5ce4f3  gnupg-1.0.7-16.src.rpm

i386:
cfcc3babbfc6f972dabbbac06e685f7d  gnupg-1.0.7-16.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/gnupg-1.0.7-16.src.rpm
d15956e38c9d217ac93f5ed0cd5ce4f3  gnupg-1.0.7-16.src.rpm

i386:
cfcc3babbfc6f972dabbbac06e685f7d  gnupg-1.0.7-16.i386.rpm

Red Hat Enterprise Linux AS version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/gnupg-1.2.1-15.src.rpm
e37b4079cb0dc795de0019b14a363f2a  gnupg-1.2.1-15.src.rpm

i386:
8ef6ad0316bec8ede544c25cf7e30717  gnupg-1.2.1-15.i386.rpm

ia64:
594517a016b7bc7bee68cbca40bd9ead  gnupg-1.2.1-15.ia64.rpm

ppc:
ac5d223e4a840999eecb87bc2626f7f1  gnupg-1.2.1-15.ppc.rpm

s390:
5bfa85eae3fda393ca1a80ef12107221  gnupg-1.2.1-15.s390.rpm

s390x:
a83363632fb9f9e77db7593f878c0136  gnupg-1.2.1-15.s390x.rpm

x86_64:
0ec4f9ce23dc41ca9a0e17c40ba3fbd4  gnupg-1.2.1-15.x86_64.rpm

Red Hat Desktop version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/gnupg-1.2.1-15.src.rpm
e37b4079cb0dc795de0019b14a363f2a  gnupg-1.2.1-15.src.rpm

i386:
8ef6ad0316bec8ede544c25cf7e30717  gnupg-1.2.1-15.i386.rpm

x86_64:
0ec4f9ce23dc41ca9a0e17c40ba3fbd4  gnupg-1.2.1-15.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/gnupg-1.2.1-15.src.rpm
e37b4079cb0dc795de0019b14a363f2a  gnupg-1.2.1-15.src.rpm

i386:
8ef6ad0316bec8ede544c25cf7e30717  gnupg-1.2.1-15.i386.rpm

ia64:
594517a016b7bc7bee68cbca40bd9ead  gnupg-1.2.1-15.ia64.rpm

x86_64:
0ec4f9ce23dc41ca9a0e17c40ba3fbd4  gnupg-1.2.1-15.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

SRPMS:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/gnupg-1.2.1-15.src.rpm
e37b4079cb0dc795de0019b14a363f2a  gnupg-1.2.1-15.src.rpm

i386:
8ef6ad0316bec8ede544c25cf7e30717  gnupg-1.2.1-15.i386.rpm

ia64:
594517a016b7bc7bee68cbca40bd9ead  gnupg-1.2.1-15.ia64.rpm

x86_64:
0ec4f9ce23dc41ca9a0e17c40ba3fbd4  gnupg-1.2.1-15.x86_64.rpm

Red Hat Enterprise Linux AS version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/gnupg-1.2.6-3.src.rpm
174cd0720920c12354f2240722df75f9  gnupg-1.2.6-3.src.rpm

i386:
355d8f416080f4630fde887d970aa5aa  gnupg-1.2.6-3.i386.rpm

ia64:
d414315f567d1e29f59e0b39b94e067e  gnupg-1.2.6-3.ia64.rpm

ppc:
8b2400f89d1a5238988fd5d55cbc6ac6  gnupg-1.2.6-3.ppc.rpm

s390:
e6cc5d8bb6055da2bd328261485b1097  gnupg-1.2.6-3.s390.rpm

s390x:
ec581afb36353fb531634cb835f4f3e1  gnupg-1.2.6-3.s390x.rpm

x86_64:
a9b6b5a4051daa5cf86aa7a3279e54a4  gnupg-1.2.6-3.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/gnupg-1.2.6-3.src.rpm
174cd0720920c12354f2240722df75f9  gnupg-1.2.6-3.src.rpm

i386:
355d8f416080f4630fde887d970aa5aa  gnupg-1.2.6-3.i386.rpm

x86_64:
a9b6b5a4051daa5cf86aa7a3279e54a4  gnupg-1.2.6-3.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/gnupg-1.2.6-3.src.rpm
174cd0720920c12354f2240722df75f9  gnupg-1.2.6-3.src.rpm

i386:
355d8f416080f4630fde887d970aa5aa  gnupg-1.2.6-3.i386.rpm

ia64:
d414315f567d1e29f59e0b39b94e067e  gnupg-1.2.6-3.ia64.rpm

x86_64:
a9b6b5a4051daa5cf86aa7a3279e54a4  gnupg-1.2.6-3.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

SRPMS:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/gnupg-1.2.6-3.src.rpm
174cd0720920c12354f2240722df75f9  gnupg-1.2.6-3.src.rpm

i386:
355d8f416080f4630fde887d970aa5aa  gnupg-1.2.6-3.i386.rpm

ia64:
d414315f567d1e29f59e0b39b94e067e  gnupg-1.2.6-3.ia64.rpm

x86_64:
a9b6b5a4051daa5cf86aa7a3279e54a4  gnupg-1.2.6-3.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-2006-0049
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0455

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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