CentOS 5526 Published by

https://rhn.redhat.com/errata/RHSA-2005-136.html refers

updated files are :-

updates/i386/RPMS/mailman-2.1.5-24.rhel3.i386.rpm

updates/i386/SRPMS/mailman-2.1.5-24.rhel3.src.rpm

To update CentOS 3.4 to this new version run 'yum update mailman'

CentOS 3.3 shipped with an earlier version of mailman - mailman-2.0.13-5
- in the extras repo. This version has not been supported since 3.4 was released, (
http://www.centos.org/modules/news/article.php?storyid=34)
however this version may be vulnerable to the exploit so it is recommended that all users upgrade.

Details of the upgrade procedure may be found at

http://www.centos.org/mailman