GHSA-f67q-wr6w-23jq Boa has an uncaught exception when transitioning the state of `AsyncGenerator` objects

• crates.io boa_engine: >= 0.16, < 0.19.0 → fixed in 0.19.0

A wrong assumption made when handling ECMAScript's `AsyncGenerator` operations can cause an uncaught exception on certain scripts. Details Boa's implementation of `AsyncGenerator` makes the assumption that the state of an `AsyncGenerator` object cannot change while resolving a promise created by methods of `AsyncGenerator` such as `%AsyncGeneratorPrototype%.next`, `%AsyncGeneratorPrototype%.return`, or `%AsyncGeneratorPrototype%.throw`. However, a carefully constructed code could trigger a state transition from a getter method for the promise's `then` property, which causes the engine to fail an assertion of this assumption, causing an uncaught exception. This could be used to create a Denial Of Service attack in applications that run arbitrary ECMAScript code provided by an external user. Patches Version 0.19.0 is patched to correctly handle this case. Workarounds Users unable to upgrade to the patched version would want to use `std::panic::catch_unwind` to ensure any exceptions caused by the engine don't impact the availability of the main application. References • https://github.com/boa-dev/boa/commit/69ea2f52ed976934bff588d6b566bae01be313f7 • https://github.com/tc39/ecma262/security/advisories/GHSA-g38c-wh3c-5h9r