We knew Apple would release an iOS update to fix the PDF exploit used in jailbreakMe and it’s now available.
The iOS 4.3.4 update appears to only address the security flaw related to viewing PDF files in Safari on your iOS device. This vulnerability allows an iPad, iPad 2, iPhone or iPod Touch with iOS 4.3.3 to be jailbroken by visiting jailbreakme.com but other hackers could also use the exploit for malicious reasons. That is why Comex also released PDF Patcher 2 at the same time the jailbreak was released.
If you do not have a jailbroken device or plan on jailbreaking, then it’s a good idea to update to iOS 4.3.4.
However, jailbreakers should avoid this update. If you update to iOS 4.3.4 and have not saved your SHSH Blobs, then you will not be able to jailbreak your device until another compatible jailbreak is released.
Devices compatible with this software update:
Security Patch Description: Viewing a maliciously crafted PDF file may lead to an unexpected application termination or arbitrary code execution.