CVE-2024-43357
JavaScript Async Generator Type Confusion Vulnerability in ECMAScript
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
INFO
Published Date :
Aug. 15, 2024, 7:15 p.m.
Last Modified :
Aug. 19, 2024, 1 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
4.7
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2024-43357 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2024-43357
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2024-43357.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
A proposal to curtail the power of "thenable" objects.
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2024-43357 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2024-43357 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Received by [email protected]
Aug. 15, 2024
Action Type Old Value New Value Added 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 Added Reference GitHub, Inc. https://github.com/tc39/ecma262/security/advisories/GHSA-g38c-wh3c-5h9r [No types assigned] Added Reference GitHub, Inc. https://github.com/boa-dev/boa/security/advisories/GHSA-f67q-wr6w-23jq [No types assigned] Added Reference GitHub, Inc. https://github.com/tc39/ecma262/pull/2413 [No types assigned] Added Reference GitHub, Inc. https://github.com/tc39/ecma262/commit/1e24a286d0a327d08e1154926b3ee79820232727 [No types assigned] Added Reference GitHub, Inc. https://github.com/tc39/ecma262/commit/4cb5a6980e20be76c648f113c4cc762342172df3 [No types assigned] Added Reference GitHub, Inc. https://bugs.webkit.org/show_bug.cgi?id=275407 [No types assigned] Added Reference GitHub, Inc. https://bugzilla.mozilla.org/show_bug.cgi?id=1901411 [No types assigned] Added Reference GitHub, Inc. https://issues.chromium.org/issues/346692561 [No types assigned] Added Reference GitHub, Inc. https://tc39.es/ecma262/#sec-asyncgenerator-objects [No types assigned] Added Reference GitHub, Inc. https://www.cve.org/CVERecord?id=CVE-2024-7652 [No types assigned] Added CWE GitHub, Inc. CWE-248 Added CWE GitHub, Inc. CWE-476 Added CWE GitHub, Inc. CWE-843 Added CVSS V3.1 GitHub, Inc. AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2024-43357 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2024-43357
weaknesses.