Adicionar os repositórios abaixo:

rpm -ivh http://download1.rpmfusion.org/free/fedora/rpmfusion-free-release-stable.noarch.rpm
rpm -ivh http://download1.rpmfusion.org/nonfree/fedora/rpmfusion-nonfree-release-stable.noarch.rpm

Execute:

yum list all > yum_list.txt
grep unrar yum_list.txt

Instale:

yum install unrar