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Category:   Application (E-mail Server)  >   Postfix Vendors:   Postfix.org
(Conectiva Issues Fix) Postfix Mail Server Can Be Crashed By Remote Users Initiating Unsuccessful Sessions
SecurityTracker Alert ID:  1002822
SecurityTracker URL:  http://securitytracker.com/id/1002822
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 26 2001
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Postfix version 20010228-pl05, other versions are apparently affected
Description:   A denial of service vulnerability was reported in the Postfix mailer. A remote user can cause the mail server to consume all available memory and crash.

It is reported that a remote user can cause the Postfix smtpd to consume all available memory by initiating a large number of unsuccessful sessions. This is apparently due to the lack of a resource limit on the dynamically allocated SMTP session log.

Impact:   A remote user can cause the mail server to consume all available memory and crash.
Solution:   The vendor has released a fix.

ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/postfix-19990627-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/postfix-19990627-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/postfix-19990627-2U51_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/postfix-19990627-2U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/postfix-19991231-5U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/postfix-19991231-5U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/postfix-20010228pl02-7U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/postfix-doc-20010228pl02-7U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/postfix-20010228pl02-7U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/postfix-19990627-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/postfix-19990627-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/postfix-19990627-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/postfix-19990627-2U50_1cl.i386.rpm

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

Vendor URL:  www.postfix.org/ (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Conectiva)

Message History:   This archive entry is a follow-up to the message listed below.
Nov 15 2001 Postfix Mail Server Can Be Crashed By Remote Users Initiating Unsuccessful Sessions



 Source Message Contents

Subject:  [conectiva-updates] [CLA-2001:439] Conectiva Linux Security Announcement - postfix


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

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

PACKAGE   : postfix
SUMMARY   : Possivble remote DoS
DATE      : 2001-11-26 15:47:00
ID        : CLA-2001:439
RELEVANT
RELEASES  : 5.0, prg graficos, ecommerce, 5.1, 6.0, 7.0

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

DESCRIPTION
 Postfix is a widely used MTA (Mail Transport Agent, sometimes called
 just an email or SMTP server).
 
 Wietse Venema reported[1] a vulnerability[2] in Postfix where a
 remote attacker could cause a DoS (denial of service) condition on
 the server. The SMTP session log could grow to an unreasonable size
 and possibly exhaust the server's memory if no other limits were in
 place.


SOLUTION
 It is recommended that all Postfix users upgrade their servers.
 
 
 REFERENCES
 1. http://www.securityfocus.com/archive/1/240354
 2. http://www.securityfocus.com/bid/3544
 3. http://www.postfix.org


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/postfix-19990627-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/postfix-19990627-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/postfix-19990627-2U51_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/postfix-19990627-2U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/postfix-19991231-5U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/postfix-19991231-5U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/postfix-20010228pl02-7U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/postfix-doc-20010228pl02-7U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/postfix-20010228pl02-7U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/postfix-19990627-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/postfix-19990627-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/postfix-19990627-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/postfix-19990627-2U50_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: conectiva-updates-subscribe@papaleguas.conectiva.com.br
unsubscribe: conectiva-updates-unsubscribe@papaleguas.conectiva.com.br
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org

iD8DBQE8AoD/42jd0JmAcZARAh/BAJ95BpcVp1Mbd4eVQDLjujanN2/Q3wCfamNT
ylMoAYXr4+xNomZIGkAIIC0=
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-----END PGP SIGNATURE-----



 
 


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