More than one consultants from one security company have remarked that Apple has released the Mac OS X Lion, made security repairing measures of massive scale, enabled the OS X operating system to be armed with the securest performance among the mainstream operating, exceeding even its rivals, Windows 7 and Ubuntu Linux. Charlie Miller from the security company Accuvant enjoys a certain reputation in Mac hacker circle. He was known for his discovery of all sorts of Mac security vulnerabilities. However, this time, Charlie is glad to see that Safari has improved significant in its security. He had once managed to break into the OS X system through taking advantage of the Safari vulnerability. The latest edition of Safari V 5.1 divides the internal processing into two parts: user interface and Webkit engine. In this way, the potential danger can be well managed so that another part will not be influenced when any one part is being attacked. In the same time, Apple has finally adopted comprehensively the ASLR technology in this edition to prevent attackers from positioning the location of the attack code to realize the goal of blocking overflow attacks. This technology is merely partially adopted in the Snow Leopard system. It is not comprehensively applied to until Apple has released the Lion system. Apple has also blocked the previous vulnerabilities detected by Miller when carrying out the malware scan, repairing and alternations. In the same time, Apple provides the users with the brand new Fielvault 2 encrypting system to prevent hackers from obtaining and manipulating users' information and data. In the end, another hacker who has co-written the book with Miller, Dion Dai Zovi, claims that from the security perspective, Snow Leopard system is more progressed than Leopard system, but it is the Lion system that has made an enormous improvement. Zovi thinks that the security rating of Lion embraces two more plus than Windows 7. Some MacBook Air users are unable to upgrade to Lion system due to the malfunction of Mac applications. But it appears that this malfunction imposes impacts only to the last edition of MBA instead of the new edition issued in yesterday. The problem occurs when the users attempt to upgrade their latest edition of Snow Leopard to Mac OS 10.6.8. After having upgraded to the 10.6.8, some MBA users report the problem directed toward Mac application store. One false message indicates that your driver or computer fails to be verified; please contact costumer service for help. This problem affects only the Mac application store because users can still log on iTunes and application stores of iPhone and iPad through their Apple account.
