Red Hat Network (RHN) Satellite 5.3 and 5.4 exposes a dangerous, obsolete XML-RPC API, which allows remote authenticated users to access arbitrary files and cause a denial of service (failed yum operations) via vectors related to configuration and package group (comps.xml) files for channels.
https://exchange.xforce.ibmcloud.com/vulnerabilities/66690
https://bugzilla.redhat.com/show_bug.cgi?id=584118
http://www.vupen.com/english/advisories/2011/0967
http://www.securitytracker.com/id?1025316
http://www.securityfocus.com/bid/47316