Questions and Answers
What is the primary purpose of a non-executable stack?
How does Address Space Layout Randomization (ASLR) decrease an attacker's chance of success?
Which of the following statements about ASLR is true?
What significant effect does a non-executable stack have on existing software?
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What type of attack does ASLR specifically aim to defend against?
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Study Notes
Non-executable Stack
- Prevents execution of shellcode by marking the stack as non-executable.
- Software that requires an executable stack may become incompatible or cease to function properly.
Address Space Layout Randomization (ASLR)
- Reduces predictability of memory usage, hindering attackers who rely on known memory locations.
- Enhances security by randomly rearranging important elements of the process address space:
- Base of the executable
- Heap memory
- Stack memory
- Libraries used by the program
- Implemented in BSD (Unix) to protect against vulnerabilities associated with argv[].
- Used in Windows to defend against return-to-libc attacks, improving system resilience.
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Description
This quiz explores key concepts in computer security, including techniques like Non-executable Stack and Address Space Layout Randomization (ASLR). Understand how these measures protect against common vulnerabilities and the implications for existing software. Test your knowledge on their roles and effectiveness in enhancing system security.
