Apple released iOS 4.0.2 to closes a PDF exploit that brings hole of potentially malicious attack to your restricted data but unfortunately the same exploit can be used for the magnificent jailbreak app JailbreakMe. So the fix to the said problem is to upgrade your current iOS 4.0.1 to the latest, which is iOS 4.0.2
The bitter consequence is you no longer be able to jailbreak your iPhone, at least, wait till iPhone Dev comes up with a new exploit. And if you have your iPhone jailbroken, you will be losing your jailbreak ability in your iphone 4, 3GS and iPod touch 3G or 2G, because the updated iOS will break JailbreakMe.
For those who you don’t want to lose jailbreak, don’t upgrade to the latest iOS, but you can at least secure your iPhone and keep your Jailbreak, by installing PDF Loading Warner app to make your browser safe against possibly malicious PDF download. Secure iPhone From Malicious Attack Via PDF Vulnerability After Jailbreak With JailBreakMe
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