AUSCERT External Security Bulletin Redistribution

                     ESB-2003.0606 -- RHSA-2003:265-01
               Updated Sendmail packages fix vulnerability.
                              29 August 2003


        AusCERT Security Bulletin Summary

Product:                sendmail 8.12.x prior to 8.12.9
Publisher:              Red Hat
Operating System:       Red Hat Linux 9
                        Red Hat Linux 8.0
Impact:                 Denial of Service
Access Required:        Remote
CVE Names:              CAN-2003-0688

- --------------------------BEGIN INCLUDED TEXT--------------------

Hash: SHA1

- - ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Updated Sendmail packages fix vulnerability.
Advisory ID:       RHSA-2003:265-01
Issue date:        2003-08-28
Updated on:        2003-08-28
Product:           Red Hat Linux
Cross references:  
Obsoletes:         RHSA-2003:120
CVE Names:         CAN-2003-0688
- - ---------------------------------------------------------------------

1. Topic:

Updated Sendmail packages are available to fix a vulnerability in the
handling of DNS maps.

2. Relevant releases/architectures:

Red Hat Linux 8.0 - i386
Red Hat Linux 9 - i386

3. Problem description:

Sendmail is a widely used Mail Transport Agent (MTA) which is included
in all Red Hat Linux distributions.

A bug has been discovered in the handling of DNS maps in Sendmail 8.12
versions before 8.12.9. A remote attacker can exploit this issue to
crash the instance of Sendmail dealing with the request. We believe
that the nature of the bug would make remote exploitation of this issue
difficult, if at all possible. The Common Vulnerabilities and Exposures
project (cve.mitre.org) has assigned the name CAN-2003-0688 to this issue.

Red Hat Linux 8.0 and 9 include versions of Sendmail vulnerable to this
issue, however it only affects sites that use DNS maps through the
"enhdnsbl" feature.

Sendmail users that have enabled DNS maps are advised to update to the
packages contained within this erratum which include a backported patch to
correct this vulnerability.

Red Hat would like to thank the Sendmail security team for notifying us of
this issue.

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:


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):

103068 - CAN-2003-0688 sendmail remote random free()

6. RPMs required:

Red Hat Linux 8.0:



Red Hat Linux 9:



7. Verification:

MD5 sum                          Package Name
- - --------------------------------------------------------------------------
ac5560196623e14a9b13c6762ca5ca16 8.0/en/os/SRPMS/sendmail-8.12.8-6.80.src.rpm
44a2c0236d7ddab1e78f516a77e0ada7 8.0/en/os/i386/sendmail-8.12.8-6.80.i386.rpm
e747860a6f3be7656b8825e2347fb630 8.0/en/os/i386/sendmail-cf-8.12.8-6.80.i386.rpm
2468060ef217ed6744ada284f71e43f9 8.0/en/os/i386/sendmail-devel-8.12.8-6.80.i386.rpm
e47b1bb2393e310e70d0ea1a6aa825a5 8.0/en/os/i386/sendmail-doc-8.12.8-6.80.i386.rpm
2e798f9d4b87a136fd4e2b0800635551 9/en/os/SRPMS/sendmail-8.12.8-6.90.src.rpm
b449795ddf270ad3e7f5e0b1d3cdd7e4 9/en/os/i386/sendmail-8.12.8-6.90.i386.rpm
bc273f94312c562f4ed4eeac32282208 9/en/os/i386/sendmail-cf-8.12.8-6.90.i386.rpm
95ee5dff8fb357dab99a5d30d6e5704e 9/en/os/i386/sendmail-devel-8.12.8-6.90.i386.rpm
ee6a858f44090dfd8aadb797a0135ace 9/en/os/i386/sendmail-doc-8.12.8-6.90.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available from https://www.redhat.com/security/keys.html

You can verify each package with the following command:
    rpm --checksig -v <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:
    md5sum <filename>

8. References:


9. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.
Version: GnuPG v1.0.7 (GNU/Linux)


- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:


Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business 
                hours which are GMT+10:00 (AEST).  On call after hours 
                for member emergencies only.
Comment: http://www.auscert.org.au/render.html?it=1967