By W3C rule, a web browser is not permitted to read cookies from different site with different domains. So how do we beat the challenge of reading cookies from other 3rd party site when let's say you were task to integrate it in your site and there are some needed parameters that are stored on 3rd party cookies which you need to read.
You'll need your Network Admin guy for this task or if you have access to CPanel or similar UI which allows your to assign subdomain alias (CNAME).