The Cupertino firm took the measures after admitting that several of its employees' machines were targeted by hackers using malicious code.
Apple moved to protect its user base 24 hours after the incident, leading one security expert to criticise the firm over its response time.
Sophos executive Graham Cluley pointed out that Java developer Oracle pushed out a patch at the beginning of the month when the malware was first discovered.
"Whether they were the same exploits as the ones that hit Apple is a little bit unclear," he told BBC News. "But it does look like they could have been quicker on this. There has been a history of Apple being a little laid back on patches."
Apple is believed to have been targeted by the same hackers who recently attacked Facebook. Both companies are working with the authorities to track down those responsible.