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

RHSA-2005:004-01 Updated lesstif package fixes image vulnerability

Files available: lesstif-0.93.15-4.AS21.4.i386.rpm lesstif-devel-0.93.15-4.AS21.4.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