CVE-2024-43357 Information

Aug 17, 2024 cve

Description

ECMA-262 is the language specification for the scripting language ECMAScript. A problem in the ECMAScript (JavaScript) specification of async generators introduced by a May 2021 spec refactor may lead to mis-implementation in a way that could present as a security vulnerability such as type confusion and pointer dereference.

The internal async generator machinery calls regular promise resolver functions on IteratorResult (done value) objects that it creates assuming that the IteratorResult objects will not be then-ables. Unfortunately these IteratorResult objects inherit from Object.prototype so these IteratorResult objects can be made then-able triggering arbitrary behaviour including re-entering the async generator machinery in a way that violates some internal invariants.

The ECMAScript specification is a living standard and the issue has been addressed at the time of this advisory’s public disclosure. JavaScript engine implementors should refer to the latest specification and update their implementations to comply with the AsyncGenerator section.

References

Reference

https://github.com/tc39/ecma262/security/advisories/GHSA-g38c-wh3c-5h9r https://github.com/boa-dev/boa/security/advisories/GHSA-f67q-wr6w-23jq https://github.com/tc39/ecma262/pull/2413 https://github.com/tc39/ecma262/commit/1e24a286d0a327d08e1154926b3ee79820232727 https://github.com/tc39/ecma262/commit/4cb5a6980e20be76c648f113c4cc762342172df3 https://bugs.webkit.org/show_bug.cgi?id=275407 https://bugzilla.mozilla.org/show_bug.cgi?id=1901411 https://issues.chromium.org/issues/346692561 https://tc39.es/ecma262/#sec-asyncgenerator-objects https://www.cve.org/CVERecord?id=CVE-2024-7652

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