(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
(Links to External Site)
Date: Mar 14 2007
Modification of system information|
Fix Available: Yes Vendor Confirmed: Yes |
Version(s): 1.4.6 and prior versions|
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:
Gerardo Richarte of Core Security Technologies discovered this vulnerability.
A remote user can spoof signed message content.|
Red Hat has released a fix.|
The Red Hat advisory is available at:
Vendor URL: www.gnupg.org/ (Links to External Site)
|Underlying OS: Linux (Red Hat Enterprise)|
|Underlying OS Comments: 5|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: [RHSA-2007:0107-02] Important: gnupg security update|
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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
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
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
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):
Red Hat Enterprise Linux (v. 5 server):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <email@example.com>. More contact
details at https://www.redhat.com/security/team/contact/
Copyright 2007 Red Hat, Inc.
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Version: GnuPG v1.4.4 (GNU/Linux)
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