iPhone Rootkit? There's an App for that! - Reverse Engineering Mac ...

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iOS Security From 1,000 FeetNutshell:• Bootloader verifies…• signed firmware verifies…• signed kernel verifies…• signed Applications installed from the app store• Apple signed everything!Actually a pretty sound design (barring implementation problems)Copyright Trustwave 2010
Architecture OverviewApplications Processor• ARM (6 or 7 depending on idevice/version)• XNU Based Kernel (like OS X-lite on ARM)• Implements Kernel and Application Signing from bootloader down.Baseband Modem• Another ARM, handles GSM connectivity• Separated from App. Processor with its own RAM and FLASH• Mostly interesting to carrier unlocks, but not my rootkits (yet?)Hardware Encryption Introduced in iPhone 3GS• Low-level data encryption on NAND storage –− Idea is that you drop the key, and FS can’t be read.• A silly feature, really:− ‘The remote wipe feature as well as ‘Find my iPhone’ can be disabled byremoving the iPhone's SIM card.’ – Jonathan ZdziarskiCopyright Trustwave 2010
Page 5: iPhone/iOS Security Overview
Page 9 and 10: Application SecurityCode signing•
Page 11 and 12: Jailbreaking Overview
Page 13 and 14: Jailbreakme.com A Thing to Behold
Page 15 and 16: What it looks likeVisit h'p://jailb
Page 17 and 18: Weaponizing
Page 19 and 20: Patch PlanReversing the installui.d
Page 21 and 22: My “Big Fat Rootkit”… so farC
Page 23 and 24: Set-upA vanilla un-jailbroken iPhon
Page 25 and 26: Hardware: Mic and AudioAudio record
Page 27 and 28: Dumping Process DataSeveral interes
Page 29 and 30: Targeting iOS ApplicationsiOS isn
Page 31 and 32: Demo App Backdoor
Page 33 and 34: Binary Reversing Prep (continued…
Page 35 and 36: No More SecretsHint: find the LC
Page 37 and 38: Mach Binary Encryption (continued
Page 39 and 40: What’s your point?For starters…
Page 41 and 42: Objective-C Method HookingIt’s ca
Page 43 and 44: Objective-C Method Hook ExampleLets
Page 45 and 46: Injecting Our LibraryConventionally
Page 47 and 48: ConclusionsLots of security researc
Page 49 and 50: Reversing Redux: The Binary “star
Page 51 and 52: … continued: eggMalformed Times-
Page 53 and 54: class-dump on installui.dylib (aka

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