CVE-2024-43357

2024-08-1519:15:20

CWE-843

CWE-476

CWE-248

GitHub_M

web.nvd.nist.gov

ecmascript javascript async generators

CVSS3

8.6

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

AI Score

8.4

Confidence

High

EPSS

Percentile

13.7%

JSON

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

Affected configurations

Vulners

Vulnrichment

Node

tc39ecma262Range2022–2025

VendorProductVersionCPE
tc39ecma262*cpe:2.3:a:tc39:ecma262:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
tc39	ecma262	*	cpe:2.3:a:tc39:ecma262::::::::

CNA Affected

[
  {
    "vendor": "tc39",
    "product": "ecma262",
    "versions": [
      {
        "version": ">= 2022, < 2025",
        "status": "affected"
      }
    ]
  }
]