Conectiva Linux Security Announcement: Fix for two gnupg vulnerabilities

From: secure@conectiva.com.br
Subject: [CLA-2001:399] Conectiva Linux Security Announcement - gnupg
Date: Thu, 7 Jun 2001 15:44:52 -0300

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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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PACKAGE   : gnupg
SUMMARY   : Fix for two gnupg vulnerabilities
DATE      : 2001-06-07 15:44:00
ID        : CLA-2001:399
RELEVANT
RELEASES  : 4.0, 4.0es, 4.1, 4.2, 5.0, prg graficos, ecommerce, 5.1, 6.0

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DESCRIPTION
 Gnupg is a OpenPGP-compliant tool for secure communication used to,
 for example, sign emails, encrypt and decrypt sensitive data and
 verify signed text.
 
 Two vulnerabilities are being addressed with this update:
 
 1) Versions prior to 1.0.5 have a vulnerability that would allow an
 attacker to obtain the unencrypted private key of an user. In order
 to do that, the attacker would have to obtain a copy of the private
 key (which is encrypted), alter it in a specific way and put it back
 without the user's knowledge. After that, by intercepting a message
 that was signed with the replaced key, the attacker would be able to
 reconstruct the private key (unencrypted). With this key, the
 attacker would be able to personificate the user and be able to read
 his/her encrypted mail or sign emails in his/her name.
 
 2) Versions prior to 1.0.6 have a format string vulnerability that
 allows the execution of arbitrary code just by decrypting an
 encrypted file with a special filename. The flaw occurs when that
 filename is printed to the screen. By using the "--batch" option,
 this output is suppressed, and the user is then not affected. An
 exploit for this flaw has already been published.


SOLUTION
 It is recommended that all gnupg users upgrade the package.
 
 CREDITS/REFERENCES
 - fish stiqz , who reported the format string
 vulnerability (http://www.securityfocus.com/archive/1/187352);
 - Werner Koch, Gnupg maintainer, quickly published a new version;
 - ICZ researchers, who reported the private key recovery
 vulnerability (http://www.icz.cz/en/onas/krypto.html);


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/4.0/SRPMS/gnupg-1.0.6-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.0/i386/gnupg-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0/i386/gnupg-doc-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es//SRPMS/gnupg-1.0.6-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/gnupg-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/gnupg-doc-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/SRPMS/gnupg-1.0.6-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/gnupg-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/gnupg-doc-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/SRPMS/gnupg-1.0.6-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/gnupg-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/gnupg-doc-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/gnupg-1.0.6-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/gnupg-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/gnupg-doc-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/gnupg-1.0.6-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/gnupg-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/gnupg-doc-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/gnupg-1.0.6-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/gnupg-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/gnupg-doc-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/gnupg-1.0.6-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/gnupg-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/gnupg-doc-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/gnupg-1.0.6-1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/gnupg-1.0.6-1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/gnupg-doc-1.0.6-1cl.i386.rpm


ADDITIONAL INSTRUCTIONS
 Users of Conectiva Linux version 6.0 or higher may use apt to perform 
 upgrades of RPM packages:
 - add the following line to /etc/apt/sources.list if it is not there yet
   (you may also use linuxconf to do this):

 rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

 - 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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