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

RHSA-2009:0004-01 Important: openssl security update

Files available: openssl-0.9.6b-49.i386.rpm openssl-0.9.6b-49.i686.rpm openssl-devel-0.9.6b-49.i386.rpm openssl-perl-0.9.6b-49.i386.rpm openssl095a-0.9.5a-34.i386.rpm openssl096-0.9.6-34.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