iOS hacker Stefan Esser has cut the cord again and has jailbroken his iPod touch 4G on iOS 4.3.1 with his own untethered exploit found in iPad 2′s kernelcache binary. He has posted a teaser video showing untethered jb in action.
Interestingly, Apple did not fixed the kernel vulnerability in iOS 4.3.1 update he used for untether exploit. Stefan points out that because the kernelcache binary is about 8-10 MB in size, it was hard enough for Apple engineers to locate it in a short span of time. Despite being found in iPad 2 kernel, this exploit does not support the iPad 2, because there is no way to install it there (bootrom exploits fixed), confirmed Stefan. However, untether expert hacker Comex is already baking the exploit to jailbreak second-gen iPad.
Apparently, Stefan will not release a jailbreak tool but might assist iPhone Dev Team or Chronic Dev Team with the untether exploit he is having or might release it as a Cydia package (looks foggy to us).
We will update you as get more information from him. However, if you cannot hold your appetite, you can use sn0wbreeze 2.4 (for Windows) or PwnageTool (for Mac) to jailbreak (tethered) your iOS 4.3.1 easily. Just follow us on Twitter or become a Facebook fan to keep yourself updated on jailbreak and unlock news-bits.