This, in turn, widen the surface of attack and allow bugs to creep in.Ī wonderful example is the recent work of Patrick Biernat, Markus Gaasedelen, Amy Burnett for the pwn2own 2018. It's true that at the JavaScript level the browsers are designed to sandbox the code under execution (primarily by not exposing any dangerous API), but JavaScript is a very complex language to parse and execute.ĮCMAScript is the standard behind JavaScript, due to the huge marketing inflation around beginner-friendly programming languages we are experiencing today, the ECMAScript is updating fast and introducing more and more complex functionality to implement for a runtime. See for more information on Firefox vs Chromium. However, despite this defense in depth, browser vulnerabilities can often be combined with sandbox escape vulnerabilities. Firefox has very limited sandboxing, whereas Chrome and Edge have significant sandboxing. The way the sandbox works depends on the browser. This is a protection mechanism that attempts to isolate a compromised browser process and prevent it from causing further harm. However, owing to its complexity, it's not at all uncommon to find vulnerabilities that allow JavaScript to compromise the browser and gain arbitrary code execution with the privileges of the browser process.īecause these types of security bugs are so common, many browsers will implement a sandbox. It cannot do anything which is not permitted by the browser JavaScript interpreter or JIT compiler. The browser isolates JavaScript, as it executes within a browser process itself.
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