As noted by Jim Dalrymple of The Loop, Apple today updated its malware definition file "Xprotect.plist" to block older versions of Adobe Flash Player in Safari. Versions of Flash that come before the latest 11.6.602.171 update will be automatically blacklisted. To help protect users from a recent vulnerability, Apple has updated the web plug-in-blocking mechanism to disable older versions of the web plug-in: Adobe Flash PlayerThe ban comes after a security bulletin issued by Adobe earlier this week, covering three different vu