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Apple's software based mandatory access control that was introduced in iOS 2.0. It is a higher level layer on top of the XNU implementation of the TrustedBSD MAC framework.


  • 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 )


The dependency on the CodeResources file makes it vulnerable to the Incomplete Codesign Exploit

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