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Fedora: GnuPG Signing key vulnerability Print E-mail
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Posted by Team   
Fedora Phong Nguyen identified a severe bug in the way GnuPG creates anduses ElGamal keys, when those keys are used both to sign and encryptdata. This vulnerability can be used to trivially recover theprivate key.

Fedora Security Update Notification

Name        : gnupg
Version     : 1.2.3                      
Release     : 2                  
Summary     : A GNU utility for secure communication and data storage.
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

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@Red> 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@Red> 1.2.3-1

- use -fPIE instead of -fpie because some arches need it

* Mon Oct 27 2003 Nalin Dahyabhai <nalin@Red>

- build gnupg as a position-independent executable (Arjan van de Ven)

* Mon Aug 25 2003 Nalin Dahyabhai <nalin@Red>

- add Werner's key as a source file

* Fri Aug 22 2003 Nalin Dahyabhai <nalin@Red>

- update to 1.2.3

This update can be downloaded from:

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.

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