Vulnerability · Published Aug 15, 2024 · Assigned by GitHub_M
CVE-2024-43357JavaScript specification issue may lead to type confusion and pointer dereference in implementations
High 8.6
In plain English
A high-severity null pointer dereference in ecma262 from tc39. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Official 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 - https://github.com/tc39/ecma262/commit/1e24a286d0a327d08e1154926b3ee79820232727 - https://bugzilla.mozilla.org/show_bug.cgi?id=1901411 - https://github.com/boa-dev/boa/security/advisories/GHSA-f67q-wr6w-23jq - https://bugs.webkit.org/show_bug.cgi?id=275407 - https://issues.chromium.org/issues/346692561 - https://www.cve.org/CVERecord?id=CVE-2024-7652
Affected products (as reported)
Weakness: CWE-248, CWE-476, CWE-843 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
References
- https://github.com/tc39/ecma262/security/advisories/GHSA-g38c-wh3c-5h9r x_refsource_CONFIRM
- https://github.com/boa-dev/boa/security/advisories/GHSA-f67q-wr6w-23jq x_refsource_MISC
- https://github.com/tc39/ecma262/pull/2413 x_refsource_MISC
- https://github.com/tc39/ecma262/commit/1e24a286d0a327d08e1154926b3ee79820232727 x_refsource_MISC
- https://github.com/tc39/ecma262/commit/4cb5a6980e20be76c648f113c4cc762342172df3 x_refsource_MISC
- https://bugs.webkit.org/show_bug.cgi?id=275407 x_refsource_MISC
- https://bugzilla.mozilla.org/show_bug.cgi?id=1901411 x_refsource_MISC
- https://issues.chromium.org/issues/346692561 x_refsource_MISC
- https://tc39.es/ecma262/#sec-asyncgenerator-objects x_refsource_MISC
- https://www.cve.org/CVERecord?id=CVE-2024-7652 x_refsource_MISC