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Address Space Layout Randomization (ASLR) Dirk Gordon

Address Space Layout Randomization (ASLR) Dirk Gordon. Implementation (32 bit). Windows Vista 8 (2 8 = 256) bits of randomization Linux 2.6.12 16 (2 16 = 65536) bits of randomization. Process Memory. ASLR_DEMO memory layout. Buffer. 4 bytes. EBP. 4 bytes. Return Address. 4 bytes.

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Address Space Layout Randomization (ASLR) Dirk Gordon

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  1. Address Space Layout Randomization(ASLR)Dirk Gordon

  2. Implementation (32 bit) • Windows Vista • 8 (28 = 256) bits of randomization • Linux 2.6.12 • 16 (216 = 65536) bits of randomization

  3. Process Memory ASLR_DEMO memory layout Buffer 4 bytes EBP 4 bytes Return Address 4 bytes

  4. Process Memory ASLR_DEMO memory layout Buffer AAAA 4 bytes EBP 4 bytes AAAA Return Address \x00\x00\x00\x00 4 bytes

  5. Process Memory ASLR_DEMO memory layout Buffer AAAA 4 bytes EBP 4 bytes AAAA Points to System() System() Address 4 bytes System() Return Address Points to Exit() 4 bytes Binary to execute System() Parameter 4 bytes

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