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Category:   Application (E-mail Server)  >   Postfix Vendors:   Postfix.org
(Red Hat Issues Fix) Re: Postfix Mail Server Can Be Crashed By Remote Users Initiating Unsuccessful Sessions
SecurityTracker Alert ID:  1002842
SecurityTracker URL:  http://securitytracker.com/id/1002842
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Nov 28 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:   Red Hat has issued a fix for Red Hat Powertools 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/powertools/SRPMS/postfix-20011125-1SASL.src.rpm

alpha:
ftp://updates.redhat.com/7.1/en/powertools/alpha/postfix-20011125-1SASL.alpha.rpm

i386:
ftp://updates.redhat.com/7.1/en/powertools/i386/postfix-20011125-1SASL.i386.rpm

The verification checksums are:

MD5 sum Package Name
--------------------------------------------------------------------------
3f226c17cd8a8955826c3aced3f77947 7.1/en/powertools/SRPMS/postfix-20011125-1SASL.src.rpm
ba0706ce0d6e6c453a8e1afcab248eac 7.1/en/powertools/alpha/postfix-20011125-1SASL.alpha.rpm
60402b08bd489052146eec437838a829 7.1/en/powertools/i386/postfix-20011125-1SASL.i386.rpm

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

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:  [RHSA-2001:156-05] Updated postfix packages are available


---------------------------------------------------------------------
                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Updated postfix packages are available
Advisory ID:       RHSA-2001:156-05
Issue date:        2001-11-15
Updated on:        2001-11-27
Product:           Red Hat Powertools
Keywords:          postfix session log memory exhaustion denial of service
Cross references:  
Obsoletes:         
---------------------------------------------------------------------

1. Topic:

Updated postfix packages are now availble that will fix a possible denial
of service attack.

2. Relevant releases/architectures:

Red Hat Powertools 7.1 - alpha, i386

3. Problem description:

A malicious user could get postfix to exhaust a machine's memory by 
abusing its session cache which could result in a denial of service attack.
The updated postfix packages will fix these potential problems.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those
RPMs which are currently installed will be updated.  Those RPMs which are
not installed but included in the list will not be updated.  Note that you
can also use wildcards (*.rpm) if your current directory *only* contains
the
desired RPMs.

Please note that this update is also available via Red Hat Network.  Many
people find this an easier way to apply updates.  To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):



6. RPMs required:

Red Hat Powertools 7.1:

SRPMS:
ftp://updates.redhat.com/7.1/en/powertools/SRPMS/postfix-20011125-1SASL.src.rpm

alpha:
ftp://updates.redhat.com/7.1/en/powertools/alpha/postfix-20011125-1SASL.alpha.rpm

i386:
ftp://updates.redhat.com/7.1/en/powertools/i386/postfix-20011125-1SASL.i386.rpm



7. Verification:

MD5 sum                          Package Name
--------------------------------------------------------------------------
3f226c17cd8a8955826c3aced3f77947 7.1/en/powertools/SRPMS/postfix-20011125-1SASL.src.rpm
ba0706ce0d6e6c453a8e1afcab248eac 7.1/en/powertools/alpha/postfix-20011125-1SASL.alpha.rpm
60402b08bd489052146eec437838a829 7.1/en/powertools/i386/postfix-20011125-1SASL.i386.rpm
 

These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
    http://www.redhat.com/about/contact/pgpkey.html

You can verify each package with the following command:
    rpm --checksig  <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg <filename>

8. References:




Copyright(c) 2000, 2001 Red Hat, Inc.

 
 


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