Symbolic Link Vulnerability

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By restoring files, directories and symlinks to the iOS device, the path is carefully checked, so that no write accesses outside of certain domains are possible. By creating a symlink that points to somewhere else, it is possible to overcome this limitation.

Usage in evasi0n jailbreak

In the case of evasi0n, the following files, directories and symlinks are restored, all in the Media Domain:

  • directory: Media/
  • directory: Media/Recordings/
  • symlink: Media/Recordings/.haxx pointing to /var/mobile
  • directory: Media/Recordings/.haxx/DemoApp.app/
  • several files in Media/Recordings/.haxx/DemoApp.app/, Info.plist, DemoApp, Icon.png, Icon@2x.png, Icon-72.png, Icon-72@2x.png
  • file: Media/Recordings/.haxx/Library/Caches/com.apple.mobile.installation.plist

This results in the following directory and file structure:

/var/mobile/Media/Recordings/ (folder)
/var/mobile/Media/Recordings/.haxx (symlink)

/var/mobile/DemoApp.app/Info.plist
/var/mobile/DemoApp.app/DemoApp
/var/mobile/DemoApp.app/Icon.png
/var/mobile/DemoApp.app/Icon@2x.png
/var/mobile/DemoApp.app/Icon-72.png
/var/mobile/DemoApp.app/Icon-72@2x.png

/var/mobile/Library/Caches/com.apple.mobile.installation.plist

See Also

References