[Announce] [security fix] GnuPG 2.0.24 released

Werner Koch wk at gnupg.org
Tue Jun 24 16:01:18 CEST 2014


We are pleased to announce the availability of a new stable GnuPG-2
release: Version 2.0.24.  This release includes a *security fix* to
stop a possible DoS using garbled compressed data packets which can
be used to put gpg into an infinite loop.

The GNU Privacy Guard (GnuPG) is GNU's tool for secure communication
and data storage.  It can be used to encrypt data, create digital
signatures, help authenticating using Secure Shell and to provide a
framework for public key cryptography.  It includes an advanced key
management facility and is compliant with the OpenPGP and S/MIME

GnuPG-2 has a different architecture than GnuPG-1 (e.g. 1.4.17) in
that it splits up functionality into several modules.  However, both
versions may be installed alongside without any conflict.  In fact,
the gpg version from GnuPG-1 is able to make use of the gpg-agent as
included in GnuPG-2 and allows for seamless passphrase caching.  The
advantage of GnuPG-1 is its smaller size and the lack of dependency on
other modules at run and build time.  We will keep maintaining GnuPG-1
versions because they are very useful for small systems and for server
based applications requiring only OpenPGP support.

GnuPG is distributed under the terms of the GNU General Public License
(GPLv3+).  GnuPG-2 works best on GNU/Linux and *BSD systems but is
also available for other Unices, Microsoft Windows and Mac OS X.

What's New in 2.0.24

 * gpg: Avoid DoS due to garbled compressed data packets.

 * gpg: Screen keyserver responses to avoid importing unwanted keys
   from rogue servers.

 * gpg: The validity of user ids is now shown by default.  To revert
   this add "list-options no-show-uid-validity" to gpg.conf.

 * gpg: Print more specific reason codes with the INV_RECP status.

 * gpg: Allow loading of a cert only key to an OpenPGP card.

 * gpg-agent: Make ssh support for ECDSA keys work with Libgcrypt 1.6.

 * Minor bug fixes.

Getting the Software

Please follow the instructions found at https://www.gnupg.org/download/
or read on:

GnuPG 2.0.24 may be downloaded from one of the GnuPG mirror sites or
direct from ftp://ftp.gnupg.org/gcrypt/gnupg/ .  The list of mirrors
can be found at https://www.gnupg.org/mirrors.html .  Note that GnuPG
is not available at ftp.gnu.org.

On ftp.gnupg.org and on its mirrors you should find the following new
files in the gnupg/ directory:

  - The GnuPG-2 source code compressed using BZIP2 and its OpenPGP

    gnupg-2.0.24.tar.bz2     (4201k)

  - A patch file to upgrade a 2.0.23 GnuPG source tree.  This patch does
    not include updates of the language files.

    gnupg-2.0.23-2.0.24.diff.bz2 (20k)

Note, that we don't distribute gzip compressed tarballs for GnuPG-2.
A Windows version will eventually be released at https://gpg4win.org .

Checking the Integrity

In order to check that the version of GnuPG which you are going to
install is an original and unmodified one, you can do it in one of
the following ways:

 * If you already have a trusted version of GnuPG installed, you
   can simply check the supplied signature.  For example to check the
   signature of the file gnupg-2.0.24.tar.bz2 you would use this command:

     gpg --verify gnupg-2.0.24.tar.bz2.sig

   This checks whether the signature file matches the source file.
   You should see a message indicating that the signature is good and
   made by that signing key.  Make sure that you have the right key,
   either by checking the fingerprint of that key with other sources
   or by checking that the key has been signed by a trustworthy other
   key.  Note, that you can retrieve the signing key using the command

     finger wk ,at' g10code.com

   or using a keyserver like

     gpg --keyserver keys.gnupg.net --recv-key 4F25E3B6

   The distribution key 4F25E3B6 is signed by the well known key


 * If you are not able to use an old version of GnuPG, you have to verify
   the SHA-1 checksum.  Assuming you downloaded the file
   gnupg-2.0.24.tar.bz2, you would run the sha1sum command like this:

     sha1sum gnupg-2.0.24.tar.bz2

   and check that the output matches the first line from the
   following list:

010e027d5f622778cadc4c124013fe515ed705cf  gnupg-2.0.24.tar.bz2
594d7f91ba4fc215345f18afee46c4aa9f2b3303  gnupg-2.0.23-2.0.24.diff.bz2


The file gnupg.info has the complete user manual of the system.
Separate man pages are included as well; however they have not all the
details available in the manual.  It is also possible to read the
complete manual online in HTML format at


or in Portable Document Format at

  https://www.gnupg.org/documentation/manuals/gnupg.pdf .

The chapters on gpg-agent, gpg and gpgsm include information on how
to set up the whole thing.  You may also want search the GnuPG mailing
list archives or ask on the gnupg-users mailing lists for advise on
how to solve problems.  Many of the new features are around for
several years and thus enough public knowledge is already available.

Almost all mail clients support GnuPG-2.  Mutt users may want to use
the configure option "--enable-gpgme" during build time and put a "set
use_crypt_gpgme" in ~/.muttrc to enable S/MIME support along with the
reworked OpenPGP support.


Please consult the archive of the gnupg-users mailing list before
reporting a bug <https://gnupg.org/documentation/mailing-lists.html>.
We suggest to send bug reports for a new release to this list in favor
of filing a bug at <https://bugs.gnupg.org>.  We also have a dedicated
service directory at:


The driving force behind the development of GnuPG is the company of
its principal author, Werner Koch.  Maintenance and improvement of
GnuPG and related software takes up most of their resources.  To allow
him to continue this work he kindly asks to either purchase a support
contract, engage g10 Code for custom enhancements, or to donate money:



We have to thank all the people who helped with this release, be it
testing, coding, translating, suggesting, auditing, administering the
servers, spreading the word, and answering questions on the mailing

Happy Hacking,

  The GnuPG Team

Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.
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