Updated Sendmail packages fix vulnerability.

Updated Sendmail packages that fix a potentially-exploitable vulnerability
are now available.

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


Michal Zalewski found a bug in the prescan() function of unpatched Sendmail
versions prior to 8.12.10. The sucessful exploitation of this bug can lead
to heap and stack structure overflows. Although no exploit currently
exists, this issue is locally exploitable and may also be remotely
exploitable. The Common Vulnerabilities and Exposures project
(cve.mitre.org) has assigned the name CAN-2003-0694 to this issue.

Additionally, for Red Hat Linux 8.0 and 9 we have included a fix for a
potential buffer overflow in ruleset parsing. This problem is not
exploitable in the default sendmail configuration; it is exploitable only
if non-standard rulesets recipient (2), final (4), or mailer-specific
envelope recipients rulesets are used. The Common Vulnerabilities and
Exposures project (cve.mitre.org) has assigned the name CAN-2003-0681 to
this issue.

All users are advised to update to these erratum packages containing a
backported patch which corrects these vulnerabilities.

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.

If up2date fails to connect to Red Hat Network due to SSL Certificate
Errors, you need to install a version of the up2date client with an updated
certificate. The latest version of up2date is available from the Red Hat
FTP site and may also be downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

104563 - CAN-2003-0694 Sendmail possible remote exploit

https://www.redhat.com/security/data/cve/CVE-2003-0681.html
https://www.redhat.com/security/data/cve/CVE-2003-0694.html
http://marc.theaimsgroup.com/?l=bugtraq&m=106381604923204&w=2
http://www.sendmail.org/8.12.10.html