iOS 8.3 it was not an update specifically designed to block any solution jailbreak, but the Apple company took the opportunity to block another exploit used by the hackers of the TaiG team to launch the iOS 8 jailbreak solution, so that now the vulnerability cannot be used in future programs. Apple lists 39 vulnerabilities solved in iOS 8.3, almost as many as in the case of the transition from iOS 7 to iOS 8, and among them we find one with the code CVE-2015-1087 it being attributed to the hackers of the TaiG team.
This vulnerability exists in the backup system of iOS, hackers take advantage of it to access restricted areas of the operating system and create the jailbreak solution used by millions of people around the world, so its repair was required for to ensure iOS security. Although Apple blocked the TaiG jailbreak solution since iOS 8.1.3, the vulnerability could be used for a iOS 8.3 jailbreak if it wasn't blocked now, but this is no longer valid, so hackers will have to discover new vulnerabilities to exploit.
Backup
Available for: iPhone 4s and later, iPod touch (5th generation) and later, iPad 2 and later
Impact: An attacker may be able to use the backup system to access restricted areas of the file system
Description: An issue exists in the relative path evaluation logic of the backup system. These issues were addressed through improved path evaluation.
CVE-ID
CVE-2015-1087 : TaiG Jailbreak Team
