![]() For example, Pangu9 for iOS 9.x exploited at least five vulnerabilities, including a use-after-free kernel bug (CVE-2015-6794) and an arbitrary file system access vulnerability in the Photos app (CVE-2015-7037). Still, we recommend studying the techniques that have been used to jailbreak various versions of iOS-you'll encounter many interesting exploits and learn a lot about OS internals. As a security tester, you'll most likely want to use publicly available jailbreak tools. The word "jailbreak" is a colloquial reference to all-in-one tools that automate the disabling process.ĭeveloping a jailbreak for a given version of iOS is not easy. custom code or downloaded from alternative app stores such as Cydia or Sileo). The purpose of jailbreaking is to disable iOS protections (Apple's code signing mechanisms in particular) so that arbitrary unsigned code can run on the device (e.g. This is why even official iOS images can't be installed if they aren't signed by Apple, and it makes iOS downgrades only possible for as long as the previous iOS version is still signed. On iOS devices, flashing a custom ROM is impossible because the iOS bootloader only allows Apple-signed images to be booted and flashed. ![]() The bootloader may require an exploit to unlock it.
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