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UNIRAS Brief - 400/03 - Conectiva - GnuPG key validity vulnerability



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 400/03 dated 14.07.03  Time: 16:00
 UNIRAS is part of NISCC(National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

Conectiva Security Advisory:

GnuPG key validity vulnerability

Detail
====== 

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Hash: SHA1

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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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PACKAGE   : gnupg
SUMMARY   : -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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PACKAGE   : gnupg
SUMMARY   : GnuPG key validity vulnerability
DATE      : 2003-07-11 16:02:00
ID        : CLA-2003:694
RELEVANT
RELEASES  : 7.0, 8, 9

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DESCRIPTION
 GnuPG[1] is a OpenPGP-compliant tool for secure communication used
 to, for example, sign emails, encrypt, decrypt and verify (signed)
 data.
 
 During the development of GnuPG 1.2.2, a bug has been found in the
 key validation code. This bug causes keys with more than one user ID
 to give all user IDs on the key the amount of validity given to the
 most-valid key. In this situation, GnuPG would not emit a warning
 when a low trust ID is used for encryption if that key also contains
 a trusted enough ID.
 
 Keys with only one ID are not affected by this problem.
 
 For Conectiva Linux 7.0 and 8, the GnuPG package has been updated to
 version 1.0.7 and includes a fix provided by the authors[2]. GnuPG in
 Conectiva Linux 9 does not need a version upgrade and includes the
 same patch.
 


SOLUTION
 It is recommended that all GnuPG users upgrade their packages.
 
 IMPORTANT: as part of the changes introduced in GnuPG versions 1.0.7
 and later, public keys for which the user as a corresponding secret
 key are no longer automatically considered trusted. To ease the
 transition, a script called "convert-from-106" (part of GnuPG-1.2.2)
 has been included in these packages. If executed, this script will
 mark as trusted all public keys for which the current user has the
 corresponding private keys.
 
 
 REFERENCES
 1.http://www.gnupg.org/
 2.http://lists.gnupg.org/pipermail/gnupg-announce/2003q2/000268.html
 3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=2003-0255


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/gnupg-1.0.7-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/gnupg-1.0.7-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/gnupg-doc-1.0.7-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/gnupg-1.0.7-1U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/gnupg-1.0.7-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/gnupg-doc-1.0.7-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/gnupg-1.2.1-19780U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/gnupg-1.2.1-19780U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/gnupg-doc-1.2.1-19780U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/gnupg-keyserver-plugins-1.2.1-19780U90_1cl.i386.rpm


ADDITIONAL INSTRUCTIONS
 The apt tool can be used to perform RPM packages upgrades:

 - run:                 apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions reagarding the use of apt and upgrade examples 
 can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at 
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en

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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

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Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com

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subscribe: conectiva-updates-subscribe@xxxxxxxxxxxxxxxxxxxxxxxxxxx
unsubscribe: conectiva-updates-unsubscribe@xxxxxxxxxxxxxxxxxxxxxxxxxxx
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

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=s3ko
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DATE      : 2003-07-11 16:02:00
ID        : CLA-2003:694
RELEVANT
RELEASES  : 7.0, 8, 9

- - -------------------------------------------------------------------------

DESCRIPTION
 GnuPG[1] is a OpenPGP-compliant tool for secure communication used
 to, for example, sign emails, encrypt, decrypt and verify (signed)
 data.
 
 During the development of GnuPG 1.2.2, a bug has been found in the
 key validation code. This bug causes keys with more than one user ID
 to give all user IDs on the key the amount of validity given to the
 most-valid key. In this situation, GnuPG would not emit a warning
 when a low trust ID is used for encryption if that key also contains
 a trusted enough ID.
 
 Keys with only one ID are not affected by this problem.
 
 For Conectiva Linux 7.0 and 8, the GnuPG package has been updated to
 version 1.0.7 and includes a fix provided by the authors[2]. GnuPG in
 Conectiva Linux 9 does not need a version upgrade and includes the
 same patch.
 


SOLUTION
 It is recommended that all GnuPG users upgrade their packages.
 
 IMPORTANT: as part of the changes introduced in GnuPG versions 1.0.7
 and later, public keys for which the user as a corresponding secret
 key are no longer automatically considered trusted. To ease the
 transition, a script called "convert-from-106" (part of GnuPG-1.2.2)
 has been included in these packages. If executed, this script will
 mark as trusted all public keys for which the current user has the
 corresponding private keys.
 
 
 REFERENCES
 1.http://www.gnupg.org/
 2.http://lists.gnupg.org/pipermail/gnupg-announce/2003q2/000268.html
 3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=2003-0255


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/gnupg-1.0.7-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/gnupg-1.0.7-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/gnupg-doc-1.0.7-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/gnupg-1.0.7-1U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/gnupg-1.0.7-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/gnupg-doc-1.0.7-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/SRPMS/gnupg-1.2.1-19780U90_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/gnupg-1.2.1-19780U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/gnupg-doc-1.2.1-19780U90_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/9/RPMS/gnupg-keyserver-plugins-1.2.1-19780U90_1cl.i386.rpm


ADDITIONAL INSTRUCTIONS
 The apt tool can be used to perform RPM packages upgrades:

 - run:                 apt-get update
 - after that, execute: apt-get upgrade

 Detailed instructions reagarding the use of apt and upgrade examples 
 can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en

- - -------------------------------------------------------------------------
All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at 
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en

- - -------------------------------------------------------------------------
All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

- - -------------------------------------------------------------------------
Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com

- - -------------------------------------------------------------------------
subscribe: conectiva-updates-subscribe@xxxxxxxxxxxxxxxxxxxxxxxxxxx
unsubscribe: conectiva-updates-unsubscribe@xxxxxxxxxxxxxxxxxxxxxxxxxxx
- -----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

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=s3ko
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For additional information or assistance, please contact the HELP Desk by 
telephone or Not Protectively Marked information may be sent via EMail to:
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Mon - Fri: 08:30 - 17:00 Hrs
Tel: +44 (0) 20 7821 1330 Ext 4511
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Outside of Office Hours:
On Call Duty Officer:
Tel: +44 (0) 20 7821 1330 and follow the prompts

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UNIRAS wishes to acknowledge the contributions of Conectiva for the information
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
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Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
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<End of UNIRAS Briefing>
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