Adding ASLR to Jailbroken iPhones [PDF] - Antid0te

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Relocating the Dynamic Linker (I) • dyld linked to 0x2FE00000 but contains relocation information • relocation should be possible with the standard tools $ dyldinfo -rebase /Volumes/Jasper8C148.N90OS/usr/lib/dyld | more rebase information (from local relocation records and indirect symbol table): segment section address type __DATA __mod_init_func 0x2FE28000 pointer __DATA __mod_init_func 0x2FE28004 pointer __DATA __mod_init_func 0x2FE28008 pointer __DATA __mod_init_func 0x2FE2800C pointer __DATA __mod_init_func 0x2FE28010 pointer __DATA __const 0x2FE281C0 pointer __DATA __const 0x2FE281C4 pointer __DATA __const 0x2FE281C8 pointer __DATA __const 0x2FE281CC pointer __DATA __const 0x2FE281D0 pointer __DATA __const 0x2FE281D4 pointer __DATA __const 0x2FE281D8 pointer __DATA __const 0x2FE281DC pointer __DATA __const 0x2FE281E0 pointer __DATA __const 0x2FE281E4 pointer __DATA __const 0x2FE281E8 pointer ... Stefan Esser • Adding ASLR to jailbroken iPhones • December 2010 • 42
Relocating the Dynamic Linker (II) • rebase tool fails because it does not support MH_DYLINKER files $ rebase -v -low_address 0x23456000 /Volumes/Jasper8C148.N90OS/usr/lib/dyld rebase warning: file is not a dylib or bundle for /Volumes/Jasper8C148.N90OS/usr/lib/dyld • file type can be modified with e.g. Mach-O-View Stefan Esser • Adding ASLR to jailbroken iPhones • December 2010 • 43
Page 1 and 2: http://www.sektioneins.de Adding AS
Page 3 and 4: What the talk is NOT about This tal
Page 5 and 6: Part I Introduction Stefan Esser
Page 7 and 8: Jailbroken iPhones and Security •
Page 9 and 10: Codesigning ??? • every binary on
Page 11 and 12: Example Crashdump CrashReporter Key
Page 13 and 14: Part II Dyld Shared Cache and ASLR
Page 15 and 16: Libraries where are thou? • since
Page 17 and 18: dyld_shared_cache Header Stefan Ess
Page 19 and 20: Rebasing the Libraries... • okay
Page 21 and 22: the iPhone SDK to the rescue? (II)
Page 23 and 24: Okay what now ? looking at differen
Page 25 and 26: Obvious Complications • different
Page 27 and 28: Let‘s start diffing • Python im
Page 29 and 30: Analysing the results (I) • Expec
Page 31 and 32: What are the two large unknown valu
Page 33 and 34: Small Values and Pointers • some
Page 35 and 36: iPhone libobjc does not match the s
Page 37 and 38: Analysing the different pointer pro
Page 39 and 40: What needs to be rebased? • image
Page 41: The Dynamic Linker • iPhone OS /
Page 45 and 46: Stack Randomization (I) • stack o
Page 47 and 48: Stack Randomization Test int main()
Page 49 and 50: Baby Steps... • generic solution
Page 51 and 52: Crazy Solution • Crazy Solution
Page 53 and 54: Brute Force Pointer Detection (II)
Page 55 and 56: Part IV Installing it on the iPhone
Page 57 and 58: Analysis of current Jailbreak • /
Page 59 and 60: Installing an alternative dyld •
Page 61 and 62: Thank you for listening... DEMO Ste

Adding ASLR to Jailbroken iPhones [PDF] - Antid0te

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