[Full-Disclosure] MDKSA-2003:109 - Updated gnupg packages fix vulnerability with ElGamal signing keys

From: Mandrake Linux Security Team (security_at_linux-mandrake.com)
Date: 11/28/03

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     _______________________________________________________________________

                    Mandrake Linux Security Update Advisory
     _______________________________________________________________________

     Package name: gnupg
     Advisory ID: MDKSA-2003:109
     Date: November 28th, 2003

     Affected versions: 9.0, 9.1, 9.2, Corporate Server 2.1,
                             Multi Network Firewall 8.2
     ______________________________________________________________________

     Problem Description:

     A severe vulnerability was discovered in GnuPG by Phong Nguyen
     relating to ElGamal sign+encrypt keys. From Werner Koch's email
     message:
     
     "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. Note that this is a real world vulnerability which will
     reveal your private key within a few seconds.
     
     Please *take immediate action and revoke your ElGamal signing keys*.
     Furthermore you should take whatever measures necessary to limit the
     damage done for signed or encrypted documents using that key."
     
     And also:
     
     "Note that the standard keys as generated by GnuPG (DSA and ElGamal
     encryption) as well as RSA keys are NOT vulnerable. Note also that
     ElGamal signing keys cannot be generated without the use of a special
     flag to enable hidden options and even then overriding a warning
     message about this key type. See below for details on how to identify
     vulnerable keys."
     
     MandrakeSoft urges any users who use the ElGamal sign+encrypt keys to
     immediately revoke these keys and discontinue use of them. Updated
     packages are provided that remove the ability to create these keys and
     to create signatures using these keys (thanks to David Shaw for
     writing the patch).
     _______________________________________________________________________

     References:

      http://lists.gnupg.org/pipermail/gnupg-announce/2003q4/000276.html
     ______________________________________________________________________

     Updated Packages:
      
     Corporate Server 2.1:
     d134c826e4fae506ccde3be7686888bc corporate/2.1/RPMS/gnupg-1.0.7-3.2.C21mdk.i586.rpm
     9294c6b3587a3a177b1d7ac57c1a0db2 corporate/2.1/SRPMS/gnupg-1.0.7-3.2.C21mdk.src.rpm

     Corporate Server 2.1/x86_64:
     7c4be5a2e952dd10c10f9242b91b51de x86_64/corporate/2.1/RPMS/gnupg-1.0.7-3.2.C21mdk.x86_64.rpm
     9294c6b3587a3a177b1d7ac57c1a0db2 x86_64/corporate/2.1/SRPMS/gnupg-1.0.7-3.2.C21mdk.src.rpm

     Mandrake Linux 9.0:
     f4f876cd0988362fba3718450727fd95 9.0/RPMS/gnupg-1.0.7-3.2.90mdk.i586.rpm
     a459cb6e80e56562eac4a40a2ece3777 9.0/SRPMS/gnupg-1.0.7-3.2.90mdk.src.rpm

     Mandrake Linux 9.1:
     cdec75d7675fdb36874e61795800f582 9.1/RPMS/gnupg-1.2.2-1.2.91mdk.i586.rpm
     08bba4f56d5d5eb581be7170e058133a 9.1/SRPMS/gnupg-1.2.2-1.2.91mdk.src.rpm

     Mandrake Linux 9.1/PPC:
     4c41071186f40d9895a1032ced8d0601 ppc/9.1/RPMS/gnupg-1.2.2-1.2.91mdk.ppc.rpm
     08bba4f56d5d5eb581be7170e058133a ppc/9.1/SRPMS/gnupg-1.2.2-1.2.91mdk.src.rpm

     Mandrake Linux 9.2:
     03d66699b92149590b078298063a1744 9.2/RPMS/gnupg-1.2.3-3.1.92mdk.i586.rpm
     0f5d1244d156a0b229c0d27e07c67b35 9.2/SRPMS/gnupg-1.2.3-3.1.92mdk.src.rpm

     Multi Network Firewall 8.2:
     b59a3c9a6c27c8d0c52e7a83d1ca3c75 mnf8.2/RPMS/gnupg-1.0.7-3.2.M82mdk.i586.rpm
     d4dbfe3968a94705f7a7e175e00d03c9 mnf8.2/SRPMS/gnupg-1.0.7-3.2.M82mdk.src.rpm
     _______________________________________________________________________

     To upgrade automatically use MandrakeUpdate or urpmi. The verification
     of md5 checksums and GPG signatures is performed automatically for you.

     A list of FTP mirrors can be obtained from:

      http://www.mandrakesecure.net/en/ftp.php

     All packages are signed by MandrakeSoft for security. You can obtain
     the GPG public key of the Mandrake Linux Security Team by executing:

      gpg --recv-keys --keyserver www.mandrakesecure.net 0x22458A98

     Please be aware that sometimes it takes the mirrors a few hours to
     update.

     You can view other update advisories for Mandrake Linux at:

      http://www.mandrakesecure.net/en/advisories/

     MandrakeSoft has several security-related mailing list services that
     anyone can subscribe to. Information on these lists can be obtained by
     visiting:

      http://www.mandrakesecure.net/en/mlist.php

     If you want to report vulnerabilities, please contact

      security_linux-mandrake.com

     Type Bits/KeyID Date User ID
     pub 1024D/22458A98 2000-07-10 Linux Mandrake Security Team
      <security linux-mandrake.com>
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    =bcUF
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    _______________________________________________
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