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fix new Function(<string>) allowing for arbitrary code execution
#149
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xtuc
reviewed
Mar 9, 2020
| test('throws on new Function(<string>)', async () => { | ||
| const bindings = { EvalError: EvalError } | ||
| expect(() => { new Cloudworker(`new Function('true')`, { bindings }) }).toThrow(new EvalError('Code generation from strings disallowed for this context')) // eslint-disable-line no-new | ||
| }) | ||
| }) |
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could you please add a test for disallowing Function.constructor("console.log(1)")() and similarly ({}).constructor.constructor("console.log(1)")()?
Also note that code generation applies to wasm as well:
const arr = [];
new WebAssembly.Module(arr)should be disallowed
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Pay attention to the security note — I'm really not sure if there's a way to hack around this or not. But this at least makes us consistent with CF workers in the common case.
fixes #146