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Sandbox
Apple's software based Hypervisor that was introduced in iOS 2.0.
Problem's
- In addition to the new set of frameworks in 2.0, applications had to be tweaked to use the new sandbox.
- For applications to run, they need to have a folder called _Codesign with a file inside called CodeResources
- If a userland exploit was discovered in an App Store app, the CodeResources would become invalid when a file was injected.
- The checks are not as hard on built in applications in the firmware [1] (only version.plist is checked to prevent a soft upgrade )
Exploits
The dependency on the CodeResources file makes it vulnerable to the Incomplete Codesign Exploit
