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

RHSA-2008:0165-01 Moderate: ImageMagick security update

Files available:
ImageMagick-5.3.8-21.c2.1.i386.rpm
ImageMagick-c++-5.3.8-21.c2.1.i386.rpm
ImageMagick-c++-devel-5.3.8-21.c2.1.i386.rpm
ImageMagick-devel-5.3.8-21.c2.1.i386.rpm
ImageMagick-perl-5.3.8-21.c2.1.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