Red Hat Linux Advisory: sendmail

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Red Hat Security Advisory

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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:

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):

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

6. RPMs required:

Red Hat Linux 8.0:

SRPMS:

ftp://updates.redhat.com/8.0/en/os/SRPMS/sendmail-8.12.8-6.80.src.rpm

i386:

ftp://updates.redhat.com/8.0/en/os/i386/sendmail-8.12.8-6.80.i386.rpm

ftp://updates.redhat.com/8.0/en/os/i386/sendmail-doc-8.12.8-6.80.i386.rpm

ftp://updates.redhat.com/8.0/en/os/i386/sendmail-devel-8.12.8-6.80.i386.rpm

ftp://updates.redhat.com/8.0/en/os/i386/sendmail-cf-8.12.8-6.80.i386.rpm

Red Hat Linux 9:

SRPMS:

ftp://updates.redhat.com/9/en/os/SRPMS/sendmail-8.12.8-6.90.src.rpm

i386:

ftp://updates.redhat.com/9/en/os/i386/sendmail-8.12.8-6.90.i386.rpm

ftp://updates.redhat.com/9/en/os/i386/sendmail-doc-8.12.8-6.90.i386.rpm

ftp://updates.redhat.com/9/en/os/i386/sendmail-devel-8.12.8-6.90.i386.rpm

ftp://updates.redhat.com/9/en/os/i386/sendmail-cf-8.12.8-6.90.i386.rpm

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:

http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/54367

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0688

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.