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Address Space Layout Randomization (ASLR) Implementation Details with Examples

Explore the ASLR implementation on Windows and Linux systems, including memory layout examples and binary execution details. Learn the benefits of ASLR in enhancing system security.

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Address Space Layout Randomization (ASLR) Implementation Details with Examples

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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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