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Home » Hacking News » CLA-2002:544-Conectiva Linux Security Announcement - linuxconf

CLA-2002:544-Conectiva Linux Security Announcement - linuxconf

by Nikola Strahija on November 7th, 2002 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%[email protected]".

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

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