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

RHSA-2005:019-01 Updated libtiff packages fix security issues

Files available:
libtiff-3.5.5-19.i386.rpm
libtiff-devel-3.5.5-19.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