Fedora Linux Advisory: gnupg

Fedora Security Update Notification
FEDORA-2003-025
2003-12-10

Description :
GnuPG (GNU Privacy Guard) is a GNU utility for encrypting data and
creating digital signatures. GnuPG has advanced key management
capabilities and is compliant with the proposed OpenPGP Internet
standard described in RFC2440. Since
GnuPG doesn’t use any patented algorithm, it is not compatible with
any version of PGP2 (PGP2.x uses only IDEA for symmetric-key
encryption, which is patented worldwide).

Update Information:

Phong Nguyen identified a severe bug in the way GnuPG creates
and uses ElGamal keys, when those keys are used both to sign and
encrypt data. This vulnerability can be used to trivially recover
the private key. While the default behavior of GnuPG when
generating keys does not lead to the creation of unsafe keys, by
overriding the default settings an unsafe key could have been
created.

If you are using ElGamal keys, you should revoke those keys
immediately.

The packages included in this update do not make ElGamal keys
safe to use; they merely include a patch by David Shaw that
disables functions that would generate or use ElGamal keys for
encryption.

• Mon Dec 01 2003 Nalin Dahyabhai <nalin@redhat.com> 1.2.3-2
  • incorporate patch from gnupg-announce which removes the ability
    to create ElGamal encrypt+sign keys or to sign messages with such
    keys
• Mon Oct 27 2003 Nalin Dahyabhai <nalin@redhat.com> 1.2.3-1
  • use -fPIE instead of -fpie because some arches need it
• Mon Oct 27 2003 Nalin Dahyabhai <nalin@redhat.com>
  • build gnupg as a position-independent executable (Arjan van de
    Ven)
• Mon Aug 25 2003 Nalin Dahyabhai <nalin@redhat.com>
  • add Werner’s key as a source file
• Fri Aug 22 2003 Nalin Dahyabhai <nalin@redhat.com>
  • update to 1.2.3

This update can be downloaded from:

http://download.fedora.redhat.com/pub/fedora/linux/core/updates/1/

b7457d205b1807677a352f734dd794b4 SRPMS/gnupg-1.2.3-2.src.rpm
b8d2688e98330f98e954ccffaf0aed79 i386/gnupg-1.2.3-2.i386.rpm
86b34157605dd65bd369d39a7b9d8ea2
i386/debug/gnupg-debuginfo-1.2.3-2.i386.rpm

This update can also be installed with the Update Agent; you can
launch the Update Agent with the ‘up2date’ command.