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Interview question · Systems, OS & Memory Safety

How does a browser contain a compromised page: the multi-process sandbox, site isolation, the JavaScript engine sandbox and WebAssembly?

Browsers assume the JavaScript engine will be exploited. The architecture is built so that one bug buys an attacker a locked room, and they need a second, different bug to leave it.

hardEssentialNewPreparation tags: Google, Microsoft, AppleUpdated Nov 2026

Browsers assume the JavaScript engine will be exploited. The architecture is built so that one bug buys an attacker a locked room, and they need a second, different bug to leave it.

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  1. 01 State the assumptions your answer depends on.
  2. 02 Explain the mechanism and choose a control.
  3. 03 Name a condition that would change your decision.

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What if · the follow-ups in this answer

The answer works through 6 follow-ups like an interviewer would

A renderer bug lets an attacker's web page run arbitrary code inside the browser's rendering process.

  1. How is a modern browser split?
  2. What can the attacker do inside the sandboxed renderer?
  3. What does site isolation add?
  4. What would a full compromise need?
  5. What should defenders do?
  6. How would you explain the impact and response?

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UP NEXT ON YOUR JOURNEY
Next in this trackWhy do JIT compilers clash with W^X memory protection, how do runtimes reconcile them, and why are JIT bugs so valuable to attackers?Next in this trackWhat happens, step by step, when you run a program on Linux or Windows, and where does security get enforced along the way?Next in this trackHow do macOS privacy controls (TCC) and XPC services work, and how do attackers abuse them on a compromised Mac?
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