XML external entity (XXE) in the RPC interface in Spacewalk and Red Hat Network (RHN) Satellite 5.7 and earlier allows remote attackers to read arbitrary files and possibly have other unspecified impact via unknown vectors.
http://www.securityfocus.com/bid/74595
http://rhn.redhat.com/errata/RHSA-2015-0957.html
http://lists.opensuse.org/opensuse-security-announce/2015-05/msg00020.html