voucher_swap: Exploiting MIG reference counting in iOS 12

Posted by Brandon Azad, Project Zero In this post I'll describe how I discovered and exploited CVE-2019-6225, a MIG reference counting vulnerability in XNU's taskswapmachvoucher function. We'll see how to exploit this bug on iOS 12.1.2 to build a fake kernel task port, giving us the ability to re...

iOS / macOS - task_swap_mach_voucher() Use-After-Free Exploit

/ voucherswap-poc.c Brandon Azad / if 0 iOS/macOS: taskswapmachvoucher does not respect MIG semantics leading to use-after-free The dangers of not obeying MIG semantics have been well documented: see issues 926 CVE-2016-7612, 954 CVE-2016-7633, 1417 CVE-2017-13861, asyncwake, 1520 CVE-2018-4139,...