Read the instructions and prepare input

• Enter your text into the input field.
• Fill the buffer with 16 bytes and the EBP with 4 bytes.
• Then, enter 4 bytes for the saved EIP in the specified format.

When characters are typed, the simulator places them into the program’s stack:

• First 16 characters → buffer
• Next 4 characters → saved EBP
• Next 4 characters → saved EIP

This demonstrates how extra input can overflow the buffer and overwrite critical values.

Analyze the buffer overflow

• Enter more than 20 characters to observe how the buffer overflows.

Fix the code

• Correct the vulnerable code.
• Click the Check button to verify your fix.

Re-test after fixing

• Submit the same input text again.
• Analyze the buffer behavior.
• This time, the buffer should not overflow.