Buffer overflow

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6 Terms

1
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When does buffer overflow happen?

When data is written beyond the boundaries of memory allocated

2
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What can buffer overflow be used to modify

Variables, data pointers, function pointers, return address of stack

3
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How can buffer overflow be prevented

  1. Ensuring the input data does not exceed size of smallest buffer

  2. Using safe functions that ensure buffer bounds (strncopy, fgets)

  3. using safe libraries

  4. static analysis

  5. dynamic analysis and testing

  6. programs that perform runtime boundary checking

4
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Function of esp

holds top stack address, points to the next empty space

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How can an esp be modified

Directly using operations that will shrink the stack

Indirectly with each pop/push elements get added/removed to/from the stack

6
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Function of ebp

points to the stack bottom.

Each time a new procedure is called, the old value of ebp is pushed down onto the stack, and the new value of esp is moved to ebp