iOS 8.4 beta 1 jailbreak
i0n1c published a video showing iOS 8.4 beta 1 has been jailbroken.YouTube

Stefan Esser, the security researcher and hacker, commonly known as i0n1c in the jailbreak community, has shared video proof that "iOS 8.4 beta 1 Jailbreak Preview 1" which Apple released last week, has been jailbroken.

The video demo suggests an iPhone 6 Plus model (iPhone 7.1) powered with iOS 8.4 beta 1 has been jailbroken with Cydia icon right on the home screen. As if to substantiate the jailbreak, he shows the Apple Watch companion app, new Music app, as well as the new Emoji keyboard in the video.

Here is a note about the iOS 8.4 beta 1 jailbreak posted by i0n1c alongside the video.

Hi fellow netizens,

Today I am delighted to share this video of a proof of concept iOS 8.4-beta 1 jailbreak that I was working on the last 4 days. Of course this video will trigger haters all over the jailbreaking scene that for some reason believe they can decide what a person is allowed to do or not do with their work. Haters gonna hate. So just ignore the haters and never let them tell you what you have to do. In that regard never let anyone bully you and stop you from showing your own hard work. Peace!

The major vulnerability used in here was found right after the SyScan 2015 security conference when I was relaxing in Singapore from several weeks of training and conferences. The vulnerability itself is however not new to iOS. Instead it is inside the code virtually forever. But the code of this jailbreak has nothing at all to do with the previous CyberElevat0r for iOS 7.1.1 - it does not share a single line of code.

I am not showing persistence or an untether at the moment because something is broken with it. But hey this is just a first proof of concept.

I will keep you posted with updates.

While the video is proof of iOS 8.4 beta 1 jailbreak, i0n1c is unlikely to release any jailbreak utility. In the past, he has contributed to the development of untethered exploits.

With the previous iOS 8 iteration, Apple has patched the security flaws that help in the development of jailbreak utilities.

In iOS 8.2, Apple fixed the MobileStorageMounter (CVE-2015-1062: TaiG Jailbreak Team), which is for the TaiG jailbreak team, whereas in the latest iOS 8.3, Apple has patched a total of 39 security flaws including the one concerning (CVE-2015-1087) TaiG jailbreak.

Check out the "iOS 8.4 beta 1 Jailbreak Preview 1" video.