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Category:   Application (Generic)  >   Linuxconf Vendors:   Conectiva
linuxconf Default Configuration on Conectiva Linux Lets Remote Users Send Open Relay Mail
SecurityTracker Alert ID:  1005581
SecurityTracker URL:  http://securitytracker.com/id/1005581
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 8 2002
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   An open relay vulnerability was reported in the linuxconf 'mailconf' module on Conectiva Linux. A remote user can send mail via the sendmail server without authorization.

Conectiva reported a vulnerability in the sendmail.cf file generated by the mailconf module that allows sendmail to be used as an open relay. A remote user can send mail without authorization by addressing the mail in the form "user%domain@".

Conectiva reports that the default sendmail.cf file distributed with Conectiva Linux sendmail is not vulnerable. However, users that have generated the sendmail.cf file using linuxconf are vulnerable.

Impact:   A remote user can send mail to arbitrary recipients via the server without authorization.
Solution:   Conectiva has issued a fix.
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/linuxconf-mailconf-1.24r2-6U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/linuxconf-1.24r2-6U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/linuxconf-mailconf-1.25r3-27U70_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/linuxconf-1.25r3-27U70_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/linuxconf-mailconf-1.25r3-39U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/linuxconf-1.25r3-39U80_1cl.src.rpm

Conectiva notes the following:

After the update, it is necessary to regenerate the sendmail.cf and the sendmail service must be restarted. In order to do that, use the option "Generate /etc/mail/sendmail.cf" from mailconf and run the command "service sendmail restart" (as root), if it was already running.

Vendor URL:  distro.conectiva.com.br/bugzilla/show_bug.cgi?id=6597 (Links to External Site)
Cause:   Configuration error
Underlying OS:  Linux (Conectiva)
Underlying OS Comments:  6.0, 7.0, 8

Message History:   None.


 Source Message Contents

Subject:  [conectiva-updates] [CLA-2002:544] Conectiva Linux Security Announcement - linuxconf


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

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

PACKAGE   : linuxconf
SUMMARY   : Open relay in mailconf module
DATE      : 2002-11-06 17:05:00
ID        : CLA-2002:544
RELEVANT
RELEASES  : 6.0, 7.0, 8

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

DESCRIPTION
 Linuxconf is an administration system which is divided in several
 modules. The mailconf module is responsible for the sendmail
 configuration.
 
 There is a problem[1] in the sendmail.cf file generated by the
 mailconf module that allows sendmail to be used as an open relay. By
 exploiting this vulnerability, a malicious user could send SPAM
 through the sendmail server without being in its served network. In
 order to do that, the recipient address of the messages must be in
 the format "user%domain@".
 
 Please note that the default sendmail.cf file distributed with our
 sendmail package is not vulnerable to this open relay problem. Only
 users who have generated the sendmail.cf file using linuxconf are.
 
 For information about mail relay and why it should be configurated
 properly, please consult the "Open Relay Database FAQ" [2].


SOLUTION
 All users of the linuxconf-mailconf module should upgrade.
 
 IMPORTANT: after the update, it is necessary to regenerate the
 sendmail.cf and the sendmail service must be restarted. In order to
 do that, use the option "Generate /etc/mail/sendmail.cf" from
 mailconf and run the command "service sendmail restart" (as root), if
 it was already running.
 
 
 REFERENCES:
 1.http://distro.conectiva.com.br/bugzilla/show_bug.cgi?id=6597
 2.http://www.ordb.org/faq/


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/linuxconf-mailconf-1.24r2-6U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/linuxconf-1.24r2-6U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/linuxconf-mailconf-1.25r3-27U70_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/linuxconf-1.25r3-27U70_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/linuxconf-mailconf-1.25r3-39U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/linuxconf-1.25r3-39U80_1cl.src.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: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
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Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

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