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Category:   Application (Security)  >   GnuPG (Gnu Privacy Guard) Vendors:   Gnupg.org
(Red Hat Issues Fix) GnuPG and Several E-mail Clients Let Remote Users Inject Unsigned Data into Signed Messages
SecurityTracker Alert ID:  1017761
SecurityTracker URL:  http://securitytracker.com/id/1017761
CVE Reference:   CVE-2007-1263   (Links to External Site)
Date:  Mar 14 2007
Impact:   Modification of system information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.4.6 and prior versions
Description:   A vulnerability was reported in GnuPG. A remote user can cause unsigned data to be represented as signed data.

Because of how GnuPG presents signature verification information, applications that use GnuPG allow for the spoofing of signed content in certain cases. A remote user can add arbitrary content to a signed message so that the recipient cannot determine that the injected content is not signed.

Several e-mail client applications do not use the proper GnuPG API to determine message boundaries and fail to differentiate message boundaries when displaying message contents.

The Enigmail, Evolution, GNUMail, KMail, Mutt, and Sylpheed e-mail clients improperly use '--status-fd' and are affected.

The GnuPG vendor was notified on February 1, 2007.

The original advisory is available at:

http://www.coresecurity.com/?action=item&id=1687

Gerardo Richarte of Core Security Technologies discovered this vulnerability.

Impact:   A remote user can spoof signed message content.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2007-0107.html

Vendor URL:  www.gnupg.org/ (Links to External Site)
Cause:   State 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.
Mar 6 2007 GnuPG and Several E-mail Clients Let Remote Users Inject Unsigned Data into Signed Messages



 Source Message Contents

Subject:  [RHSA-2007:0107-02] Important: gnupg security update


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

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Important: gnupg security update
Advisory ID:       RHSA-2007:0107-02
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2007-0107.html
Issue date:        2007-03-13
Updated on:        2007-03-14
Product:           Red Hat Enterprise Linux
CVE Names:         CVE-2007-1263 
- ---------------------------------------------------------------------

1. Summary:

Updated GnuPG packages that fix a security issue are now available for Red
Hat Enterprise Linux 5.

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 Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

3. Problem description:

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

Gerardo Richarte discovered that a number of applications that make use of
GnuPG are prone to a vulnerability involving incorrect verification of
signatures and encryption.  An attacker could add arbitrary content to a
signed message in such a way that a receiver of the message would not be
able to distinguish between the properly signed parts of a message and the
forged, unsigned, parts.  (CVE-2007-1263)

Whilst this is not a vulnerability in GnuPG itself, the GnuPG team have
produced a patch to protect against messages with multiple plaintext
packets.  Users should update to these erratum packages which contain the
backported patch for this issue.

Red Hat would like to thank Core Security Technologies for reporting this
issue.

4. Solution:

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

This update is available via Red Hat Network.  Details on how to use 
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188


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

230467 - CVE-2007-1263 gnupg signed message spoofing

6. RPMs required:

Red Hat Enterprise Linux Desktop (v. 5 client):

SRPMS:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/gnupg-1.4.5-13.src.rpm
88df873d2b167bdfbb313f3a1ec2ea63  gnupg-1.4.5-13.src.rpm

i386:
47649e57708dfae65f65af9cb619c00d  gnupg-1.4.5-13.i386.rpm
da2323dcad0b79ef3025ec908456ba49  gnupg-debuginfo-1.4.5-13.i386.rpm

x86_64:
d3954a6a0eb0f6a304b2e2ef50401927  gnupg-1.4.5-13.x86_64.rpm
b46e792adafc0994c69a34894736f09e  gnupg-debuginfo-1.4.5-13.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

SRPMS:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/gnupg-1.4.5-13.src.rpm
88df873d2b167bdfbb313f3a1ec2ea63  gnupg-1.4.5-13.src.rpm

i386:
47649e57708dfae65f65af9cb619c00d  gnupg-1.4.5-13.i386.rpm
da2323dcad0b79ef3025ec908456ba49  gnupg-debuginfo-1.4.5-13.i386.rpm

ia64:
264ad7041effae5b298835ce0ea670da  gnupg-1.4.5-13.ia64.rpm
b96a92a5570c2a2f108980e8f763b555  gnupg-debuginfo-1.4.5-13.ia64.rpm

ppc:
1a52050adf71e8b6aed8133e500569f4  gnupg-1.4.5-13.ppc.rpm
2b3765fc4aad400474eec29987157722  gnupg-debuginfo-1.4.5-13.ppc.rpm

s390x:
589c91def49fc94470e62b705bc30d28  gnupg-1.4.5-13.s390x.rpm
daffde420c50a8e5a7b8e2a97d54fbe7  gnupg-debuginfo-1.4.5-13.s390x.rpm

x86_64:
d3954a6a0eb0f6a304b2e2ef50401927  gnupg-1.4.5-13.x86_64.rpm
b46e792adafc0994c69a34894736f09e  gnupg-debuginfo-1.4.5-13.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-2007-1263
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 2007 Red Hat, Inc.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.4 (GNU/Linux)

iD8DBQFF+Bb8XlSAg2UNWIIRAvimAKCHRnvIjDVsc5yKhiLKS7jAEYJIEACgurdS
mHOURQ9pH7ycMbZYdDiA9E0=
=Y1Bb
-----END PGP SIGNATURE-----



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