De Rebus Antiquis

De Rebus Antiquis (DRA) is an exploit in iOS 7's bootchain that abuses a recursive stack overflow bug. The exploit was discovered by xerub. Tools like powdersn0w and cherryflowerJB can use this to achieve untethered downgrades on any 32-bit device you have iOS 7.x SHSH blobs saved for. This is most useful on the iPhone 4.

It was patched in iOS 8 but may work on iOS 6 or earlier.

= External links =

Analysis