TaiG jb for iOS 8.x seems to have a broken setreuid() that allows root privilege escalation. Less a backdoor than a broken kernelpatch
This means that the application "can theoretically have access to everything" on your device.
Hopefully the new version of jailbreak fully addresses the problem.
Saurik posted his thoughts on the matter yesterday:
I already talked to TaiG about this awkward kernel patch days ago, and have this on my schedule of things to fix "next" (after the thing I'm working on fixing right now). FWIW, I did not realize their patch was this bad (I mean, dude: that's pretty bad...), but I'm still not terribly concerned (as an example: i0n1c says "don't install tweaks from random people in the next few days", but those already by definition have privileged access, so you should already be careful installing them). (This setuid bug is the "proactive fix" that I talked about in the Cydia 1.1.18 changelog.)
Here's the changelog for the new version of TaiG.
Changelog: ● Fixes setreuid patch to prevent applications from obtaining to root privileges through setreuid. ● Increases stability.
I miss evasion jb because this kind of errors never happened due to a full series of test before release, jb fron them were slow to release but more confident
For users who have jailbroken their devices with TaiG Jailbreak Tool V2.0.0, update TaiG 8.1.3-8.x Untether through TaiG source (apt.taig.com) or 3K source (apt.3kzhushou.com). There is no need to jailbreak again
I tried the TaiG 2.2.0 for IOS8.4 at 60% it get black screen and hang.
Then Downloaded TaiG2.2.1 , it also stuck on 60% couple of time it restart the phone and on 3rd and fouth it give 1101