spacewalk-backend in Red Hat Network Satellite 5.4 on Red Hat Enterprise Linux 6 does not properly authorize or authenticate uploads to the NULL organization when mod_wsgi is used, which allows remote attackers to cause a denial of service (/var partition disk consumption and failed updates) via a large number of package uploads.
https://exchange.xforce.ibmcloud.com/vulnerabilities/74498
http://www.securitytracker.com/id?1026873