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TUCoPS :: Linux :: Conectiva :: bt817.txt

postfix remote DoS CLA-2003:717





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CONECTIVA LINUX SECURITY ANNOUNCEMENT 
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PACKAGE   : postfix
SUMMARY   : Remote denial of service vulnerability
DATE      : 2003-08-04 17:30:00
ID        : CLA-2003:717
RELEVANT
RELEASES  : 7.0, 8

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DESCRIPTION
 Postfix[1] is a widely used MTA (Mail Transport Agent, sometimes
 called just an email or SMTP server).
 
 This update for Conectiva Linux 7.0 and 8 fixes two vulnerabilities
 in Postfix reported[4] by Michal Zalewski:
 
 1. Postfix used as a bounce scanner (CAN-2003-0468)[2]
 By using specially created recipients, it is possible to make Postfix
 attempt to establish SMTP sessions with arbitrary hosts on arbitrary
 ports. This could be used to identify open TCP ports on remote
 machines or to just generate traffic.
 
 2. Remote denial of service (CAN-2003-0540)[3]
 A malformed address can be used to cause a denial of service
 condition in two ways:
 - by locking up the queue manager: the offending message has to be
 manually removed from the queue in order to restore the service;
 - by locking up the smtpd listener: when supplied with the malformed
 address, the listener process will stop responding. Multiple attacks
 in parallel will hang many smtpd processes, leading to a denial of
 service.
 In order to be vulnerable to this issue, the "append_dot_mydomain"
 paramater would have to be changed from the default value of "on" to
 "off".
 
 
 Conectiva Linux 9 is not vulnerable to any of these issues since it
 ships with Postfix 2.0.x.


SOLUTION
 All postfix users should upgrade their packages. The service will be
 automatically restarted after the upgrade if it was already running.
 
 
 REFERENCES
 1.http://www.postfix.org/
 2.http://cve.mitre.org/cgi-bin/cvename.cgi?name=2003-0468
 3.http://cve.mitre.org/cgi-bin/cvename.cgi?name=2003-0540
 4.http://www.securityfocus.com/archive/1/331713/2003-08-01/2003-08-07/0


UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/postfix-1.1.13-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/postfix-1.1.13-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/postfix-doc-1.1.13-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/postfix-1.1.13-1U80_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/postfix-1.1.13-1U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/postfix-doc-1.1.13-1U80_1cl.i386.rpm


ADDITIONAL INSTRUCTIONS
 The apt tool can be used to perform RPM packages upgrades:

 - 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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Copyright (c) 2003 Conectiva Inc.
http://www.conectiva.com

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