Updated libtiff packages are available for CentOS-2
The following errata for CentOS-2 have been built and uploaded the the centos mirror:
RHSA-2004:577-01 Updated libtiff packages
Files available:
libtiff-3.5.5-17.i386.rpm
libtiff-devel-3.5.5-17.i386.rpm
More details are available from the Red Hat 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