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Category:   Application (Security)  >   GnuPG (Gnu Privacy Guard) Vendors:   Gnupg.org
(Debian Issues Updated Fix) GnuPG ElGamal Signature Flaw May Disclose Type 20 ElGamal Private Keys to Remote Users
SecurityTracker Alert ID:  1009054
SecurityTracker URL:  http://securitytracker.com/id/1009054
CVE Reference:   CVE-2003-0971   (Links to External Site)
Date:  Feb 14 2004
Impact:   Disclosure of authentication information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.0.2 and later versions
Description:   A vulnerability was reported in GnuPG in the creation of ElGamal keys for digital signature. Keys used for signing can be compromised.

It is reported that Phong Nguyen discovered a flaw that allows a remote user to determine your private key within a few seconds.

In version 1.0.2 (January 2000), the flaw was introduced when the GnuPG code was modified to improve the efficiency of encryption using ElGamal keys. A common factor was used for encrypting and signing. As a result, a remtote user with access to a target user's signature can conduct a cryptographic attack to determine the target user's private key. This flaw reportedly affects only ElGamal sign+encrypt keys (type 20) in GnuPG version 1.0.2 and later.

The vendor reports that ElGamal encrypt-only keys (type 16) are not affected. Also, the DSA keys and RSA keys are not vulnerable, according to the report.

Impact:   A remote user can determine the ElGamal private key.
Solution:   Debian has released an updated fix. This fix provides a "more correct and permanent fix" than the previous Debian fix that was reported in DSA 459-1.

For the current stable distribution (woody), the new fix is available in version 1.0.6-4woody3.

Debian GNU/Linux 3.0 alias woody:

Source archives:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3.dsc
Size/MD5 checksum: 577 f5a742233c584754c479daf7dfe58a9e
http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3.diff.gz
Size/MD5 checksum: 5262 1ecf9f459e0b05c31128adac05ef2fe4
http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6.orig.tar.gz
Size/MD5 checksum: 1941676 7c319a9e5e70ad9bc3bf0d7b5008a508

Alpha architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_alpha.deb
Size/MD5 checksum: 1150082 724d4fcb6f2ff0969b5ceba82e8aabe5

ARM architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_arm.deb
Size/MD5 checksum: 986748 8efdbc409f140c1aaefadb97646944d6

Intel IA-32 architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_i386.deb
Size/MD5 checksum: 966408 50e5e44b2efa34d7c7d3a8fd630dc96a

Intel IA-64 architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_ia64.deb
Size/MD5 checksum: 1271406 4c5e77defc13bf4bae3d11431257e6a3

HP Precision architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_hppa.deb
Size/MD5 checksum: 1058822 02516b6984cf695ef31c970980d36864

Motorola 680x0 architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_m68k.deb
Size/MD5 checksum: 942188 ed7d9d16820608b3172be64f6b470b97

Big endian MIPS architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_mips.deb
Size/MD5 checksum: 1035630 9b25dd3f06580549bfa93ee429605d0e

Little endian MIPS architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_mipsel.deb
Size/MD5 checksum: 1035864 740243a767cc1ff53f116d0e97aa66a7

PowerPC architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_powerpc.deb
Size/MD5 checksum: 1009152 678b2fc28d01eac452d96f925d2d40b2

IBM S/390 architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_s390.deb
Size/MD5 checksum: 1001666 c5a70add4dfa1cb3828d9892513d3c15

Sun Sparc architecture:

http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_sparc.deb
Size/MD5 checksum: 1003634 32490333505f1804e9fcf4a786fbc293

Vendor URL:  www.gnupg.org/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Debian)
Underlying OS Comments:  3.0

Message History:   This archive entry is a follow-up to the message listed below.
Nov 27 2003 GnuPG ElGamal Signature Flaw May Disclose Type 20 ElGamal Private Keys to Remote Users



 Source Message Contents

Subject:  [SECURITY] [DSA 429-2] New gnupg packages fix cryptographic weakness



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

- --------------------------------------------------------------------------
Debian Security Advisory DSA 429-2                     security@debian.org
http://www.debian.org/security/                             Matt Zimmerman
February 13th, 2004                     http://www.debian.org/security/faq
- --------------------------------------------------------------------------

Package        : gnupg
Vulnerability  : cryptographic weakness
Problem-Type   : local
Debian-specific: no
CVE Ids        : CAN-2003-0971

Phong Nguyen identified a severe bug in the way GnuPG creates and uses
ElGamal keys for signing.  This is a significant security failure
which can lead to a compromise of almost all ElGamal keys used for
signing.

The update provided in DSA 459-1 disables the use of this type of key,
using an interim fix.  This update, DSA 459-2, implements a more
correct and permanent fix provided by David Shaw.

For the current stable distribution (woody) this problem has been
fixed in version 1.0.6-4woody3.

We recommend that you update your gnupg package.

Upgrade Instructions
- --------------------

wget url
        will fetch the file for you
dpkg -i file.deb
        will install the referenced file.

If you are using the apt-get package manager, use the line for
sources.list as given below:

apt-get update
        will update the internal database
apt-get upgrade
        will install corrected packages

You may use an automated update by adding the resources from the
footer to the proper configuration.

Debian GNU/Linux 3.0 alias woody
- --------------------------------

  Source archives:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3.dsc
      Size/MD5 checksum:      577 f5a742233c584754c479daf7dfe58a9e
    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3.diff.gz
      Size/MD5 checksum:     5262 1ecf9f459e0b05c31128adac05ef2fe4
    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6.orig.tar.gz
      Size/MD5 checksum:  1941676 7c319a9e5e70ad9bc3bf0d7b5008a508

  Alpha architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_alpha.deb
      Size/MD5 checksum:  1150082 724d4fcb6f2ff0969b5ceba82e8aabe5

  ARM architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_arm.deb
      Size/MD5 checksum:   986748 8efdbc409f140c1aaefadb97646944d6

  Intel IA-32 architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_i386.deb
      Size/MD5 checksum:   966408 50e5e44b2efa34d7c7d3a8fd630dc96a

  Intel IA-64 architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_ia64.deb
      Size/MD5 checksum:  1271406 4c5e77defc13bf4bae3d11431257e6a3

  HP Precision architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_hppa.deb
      Size/MD5 checksum:  1058822 02516b6984cf695ef31c970980d36864

  Motorola 680x0 architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_m68k.deb
      Size/MD5 checksum:   942188 ed7d9d16820608b3172be64f6b470b97

  Big endian MIPS architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_mips.deb
      Size/MD5 checksum:  1035630 9b25dd3f06580549bfa93ee429605d0e

  Little endian MIPS architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_mipsel.deb
      Size/MD5 checksum:  1035864 740243a767cc1ff53f116d0e97aa66a7

  PowerPC architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_powerpc.deb
      Size/MD5 checksum:  1009152 678b2fc28d01eac452d96f925d2d40b2

  IBM S/390 architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_s390.deb
      Size/MD5 checksum:  1001666 c5a70add4dfa1cb3828d9892513d3c15

  Sun Sparc architecture:

    http://security.debian.org/pool/updates/main/g/gnupg/gnupg_1.0.6-4woody3_sparc.deb
      Size/MD5 checksum:  1003634 32490333505f1804e9fcf4a786fbc293

  These files will probably be moved into the stable distribution on
  its next revision.

- ---------------------------------------------------------------------------------
For apt-get: deb http://security.debian.org/ stable/updates main
For dpkg-ftp: ftp://security.debian.org/debian-security dists/stable/updates/main
Mailing list: debian-security-announce@lists.debian.org
Package info: `apt-cache show <pkg>' and http://packages.debian.org/<pkg>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.4 (GNU/Linux)

iD8DBQFALZlDArxCt0PiXR4RAnwSAJ9Ca+rgs90zV39FpMLPrVQaP64WCwCfftPs
Cll8wYP1kjwXU1U/NJh7arE=
=YCPg
-----END PGP SIGNATURE-----


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