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[CLA-2002:547] Conectiva Linux Security Announcement - syslog-ng


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Date: Thu, 14 Nov 2002 17:25:03 -0200
From: [email protected]
To: [email protected], [email protected],
Subject: [CLA-2002:547] Conectiva Linux Security Announcement - syslog-ng

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- --------------------------------------------------------------------------
CONECTIVA LINUX SECURITY ANNOUNCEMENT 
- --------------------------------------------------------------------------

PACKAGE   : syslog-ng
SUMMARY   : Buffer overflow vulnerability
DATE      : 2002-11-14 17:24:00
ID        : CLA-2002:547
RELEVANT
RELEASES  : 8

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

DESCRIPTION
 syslog-ng[1] is a syslog replacement with several enhancements and
 new features.
 
 "syslog-ng" has a buffer overflow vulnerability[4] that could be
 exploited by remote attackers if certain conditions are met.
 
 The vulnerability lies in the code which deals with macro expansion
 in the syslog-ng.conf configuration file. For example, one common
 configuration which uses macros could be the following:
 
 destination d_messages_by_host {file("/var/log/$HOST/messages");};
 
 This configuration would replace the $HOST part with the hostname of
 the machine sending the log. When dealing with this expansion,
 syslog-ng fails to account for characters which are not part of the
 macro, which leads to incorrect bounds checking and a possible buffer
 overflow if there are enough non-macro characters being used.
 
 Only users who use some sort of macro expansion in the configuration
 file are vulnerable to this problem. This is not the default
 configuration of the package.


SOLUTION
 All syslog-ng users should upgrade their packages. This update
 includes additional checks and fixes to this problem done by
 Sebastian Krahmer from SuSE.
 
 IMPORTANT: after the upgrade, please restart syslog-ng manually if it
 was already running. To do so, run, as root, the following command:
 
 /sbin/service syslog-ng restart


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/8/SRPMS/syslog-ng-1.4.14-3U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/syslog-ng-1.4.14-3U80_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


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

- -------------------------------------------------------------------------
subscribe: [email protected]
unsubscribe: [email protected]
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