Adding ASLR to Jailbroken iPhones [PDF] - Antid0te

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Installing only the alternative cache • pf2 is patched to execute /sbin/antid0te instead of /sbin/launchd • antid0te sets environment variables • DYLD_SHARED_REGION = private • DYLD_SHARED_CACHE_DONT_VALIDATE = 1 • DYLD_SHARED_CACHE_DIR = /System/Library/Caches/antid0te • and executes /sbin/launchd Stefan Esser • Adding ASLR to jailbroken iPhones • December 2010 • 58
Installing an alternative dyld • pf2 is patched to execute /sbin/antid0te instead of /sbin/launchd • antid0te copies patched dyld to /usr/lib/dyld.antid0te • copies /usr/lib/dyld to /usr/lib/dyld.orig • creates directory /usr/lib/antid0te • copies antif0te.hfs to /usr/lib/antid0te.hfs • creates a symbolic link in /usr/lib/antid0te pointing to ../dyld.orig • replaces /usr/lib/dyld with symbolic link to antid0te/dyld • binds /dev/vn0 to /usr/lib/antid0te.hfs • /dev/vn0 is mounted to /usr/lib/antid0te Stefan Esser • Adding ASLR to jailbroken iPhones • December 2010 • 59
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 and 42: The Dynamic Linker • iPhone OS /
Page 43 and 44: Relocating the Dynamic Linker (II)
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: Analysis of current Jailbreak • /
Page 61 and 62: Thank you for listening... DEMO Ste
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Adding ASLR to Jailbroken iPhones [PDF] - Antid0te

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