|Apple has updated the plugin-blocking component in Safari to prevent earlier versions of Flash from being used, a new support document states. Lion, Mountain Lion, and Snow Leopard users are affected. The update comes in response to recently-discovered vulnerabilities in Flash that have already been patched by Adobe, but which could impact people who don't update on a regular basis.
As a rule, Apple has taken a more aggressive stance on security problems in recent years. Java is no longer included in OS X by default, and since Snow Leopard the OS has included a malware protection component which Apple can update remotely to block new threats. The company has had to take a slower approach with iOS, since fixing any problems with the firmware requires a new point release.