The VisNetic AntiVirus Plug-in (DKAVUpSch.exe) for Mail Server 4.6.0.4, 4.6.1.1, and possibly other versions before 4.6.1.2, does not drop privileges before executing other programs, which allows local users to gain privileges.
https://exchange.xforce.ibmcloud.com/vulnerabilities/24928
http://www.vupen.com/english/advisories/2006/0701
http://www.securityfocus.com/bid/16788
http://www.securityfocus.com/archive/1/425890/100/0/threaded
http://securitytracker.com/id?1015670