A regression error in tcp-wrappers 7.6.dbs-10 and 7.6.dbs-11 might allow remote attackers to bypass intended access restrictions when a service uses libwrap but does not specify server connection information.
https://launchpad.net/bugs/135332
https://exchange.xforce.ibmcloud.com/vulnerabilities/36364
http://www.ubuntu.com/usn/usn-507-1