It was found that the web interface provided by Red Hat Satellite to create the initial administrator user was not disabled after the initial user was created. A remote attacker could use this flaw to create an administrator user with credentials they specify. This user could then be used to assume control of the Satellite server.
Acknowledgements: This issue was discovered by Andrew Spurrier of Red Hat.
This issue has been addressed in following products: Red Hat Network Satellite Server v 5.2 Via RHSA-2013:1513 https://rhn.redhat.com/errata/RHSA-2013-1513.html
This issue has been addressed in following products: Red Hat Network Satellite Server v 5.3 Red Hat Network Satellite Server v 5.4 Red Hat Network Satellite Server v 5.5 Red Hat Satellite Server v 5.6 Via RHSA-2013:1514 https://rhn.redhat.com/errata/RHSA-2013-1514.html
Official Knowledgebase Article: https://access.redhat.com/site/articles/539283 KCS Solution (which references above Article): https://access.redhat.com/site/solutions/539313