RHN Satellite incorrectly exposed an obsolete XML-RPC API for
configuring package group (comps.xml) files for channels. An
authenticated user could use this flaw to gain access to
arbitrary files accessible to the RHN Satellite server process,
and prevent clients from performing certain yum operations.
This issue has been addressed in following products:
Red Hat Network Satellite Server v 5.3
Red Hat Network Satellite Server v 5.4
Via RHSA-2011:0434 https://rhn.redhat.com/errata/RHSA-2011-0434.html