The following errata for CentOS-2 have been built and uploaded the the centos mirror:

RHSA-2004:304-01 Updated pam packages

Files available: pam-0.75-46.9.i386.rpm: pam-devel-0.75-46.9.i386.rpm:

More details are available from the RedHat web site at https://rhn.redhat.com/errata/rh21as-errata.html

The easy way to make sure you are up to date with all the latest patches is to run: # yum update