Breaking iOS Code Signing - Reverse Engineering Mac OS X

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The Daily HoffThis app was rejected (but notfor being malware)The world will never know thisawesome appFriday, October 14, 11
InstastockAlso rejected - for illegal API usage - So Busted!!!Oh, nevermindCurrently in App StoreWill download and run arbitrary (unsigned) dylibsFriday, October 14, 11
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AgendaCode signing and iOS security
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iOS Security ModelAll code (binarie
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Malware preventionSince only signed
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Exploit mitigationNo pages are writ
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ComparisonIn OS XCan allocate RWX p
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Overview of internalsMandatory Acce
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iOS MAC policiesOnly 2 policies reg
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AMFI hooksAMFI uses the following M
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mac_vnode_check_execintmac_vnode_ch
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mpo_vnode_check_signatureSets CS_HA
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Kernel checksparse_machfile(struct
Page 25 and 26:
Actual signature validationintubc_c
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Code signing so farWhen binary is l
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Enforcement codevm_fault_enter{.../
Page 31 and 32:
Validating code matches hashvm_page
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When a page is invalidBack in vm_fa
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No new codeWe’ve seen how all exe
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Existing regionsvm_map_protect(...)
Page 39 and 40: Dynamic codesigningIn order to util
Page 41 and 42: Speed vs securityThere is a (single
Page 43 and 44: MobileSafari# ldid -e /Applications
Page 45 and 46: Inside mmapintmmap(proc_t p, struct
Page 47 and 48: Even further......if (flags & MAP_J
Page 49 and 50: Now we pass the checkvm_map_enter(.
Page 51 and 52: vm_map_enter (again)if ((flags & VM
Page 53 and 54: 7 PatchesCan be found at https://gi
Page 55 and 56: vm_map_enter (again!)vm_map_enter(.
Page 57 and 58: vm_map_protectvm_map_protect(...){.
Page 59 and 60: vm_map_protectvm_map_protect(...){.
Page 61 and 62: Allow “unvalidated” pagesSet cs
Page 63 and 64: MobileSafari shellcodeunsigned int
Page 65 and 66: Unsigned code, iOS 2void (*f)();uns
Page 67 and 68: Questions?Thanks for coming!Friday,
Page 69 and 70: An iOS 5.0 code signing bugintmmap(
Page 71 and 72: An iOS 5.0 code signing bug#define
Page 73 and 74: Allocating RWX regionsAny process w
Page 75 and 76: Running unsigned codeMalicious App
Page 77 and 78: Copy and fixup dyldint fd = open("f
Page 79 and 80: Patch 2uintptr_t ImageLoaderMachO::
Page 81 and 82: Patch 2uintptr_t ImageLoaderMachO::
Page 83 and 84: Patch 3void ImageLoaderMachO::mapSe
Page 85 and 86: Patch 3void ImageLoaderMachO::mapSe
Page 87 and 88: Patch 4void ImageLoader::link(const
Page 89: Apple review processAn app that did
Page 93 and 94: App Store Review ProcessNot very cl
Page 95: Questions?Contact me at charlie.mil
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Breaking iOS Code Signing - Reverse Engineering Mac OS X

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