CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
EPSS
Percentile
13.7%
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.
[
{
"vendor": "tc39",
"product": "ecma262",
"versions": [
{
"version": ">= 2022, < 2025",
"status": "affected"
}
]
}
]
bugs.webkit.org/show_bug.cgi?id=275407
bugzilla.mozilla.org/show_bug.cgi?id=1901411
github.com/boa-dev/boa/security/advisories/GHSA-f67q-wr6w-23jq
github.com/tc39/ecma262/commit/1e24a286d0a327d08e1154926b3ee79820232727
github.com/tc39/ecma262/commit/4cb5a6980e20be76c648f113c4cc762342172df3
github.com/tc39/ecma262/pull/2413
github.com/tc39/ecma262/security/advisories/GHSA-g38c-wh3c-5h9r
issues.chromium.org/issues/346692561
tc39.es/ecma262/#sec-asyncgenerator-objects
www.cve.org/CVERecord?id=CVE-2024-7652