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CVE-2024-43367— Boa has an uncaught exception when transitioning the state of `AsyncGenerator` objects

Quick assessment

Affected
boa-dev boa
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Boa是Boa开源的一种适用于嵌入式应用程序的开放源代码。 Boa 0.16至0.19.0之前版本存在安全漏洞，该漏洞源于允许攻击者通过精心构造的代码触发AsyncGenerator对象的状态转换，从而造成未捕获的异常，进而可能发起拒绝服务攻击。

CVSS 7.5 · High EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2024-43367

Vulnerability Information
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Vulnerability Title
Boa has an uncaught exception when transitioning the state of `AsyncGenerator` objects
Source: CVE Program / CVE List V5
Vulnerability Description
Boa is an embeddable and experimental Javascript engine written in Rust. Starting in version 0.16 and prior to version 0.19.0, a wrong assumption made when handling ECMAScript's `AsyncGenerator` operations can cause an uncaught exception on certain scripts. Boa's implementation of `AsyncGenerator` makes the assumption that the state of an `AsyncGenerator` object cannot change while resolving a promise created by methods of `AsyncGenerator` such as `%AsyncGeneratorPrototype%.next`, `%AsyncGeneratorPrototype%.return`, or `%AsyncGeneratorPrototype%.throw`. However, a carefully constructed code could trigger a state transition from a getter method for the promise's `then` property, which causes the engine to fail an assertion of this assumption, causing an uncaught exception. This could be used to create a Denial Of Service attack in applications that run arbitrary ECMAScript code provided by an external user. Version 0.19.0 is patched to correctly handle this case. Users unable to upgrade to the patched version would want to use `std::panic::catch_unwind` to ensure any exceptions caused by the engine don't impact the availability of the main application.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未捕获的异常
Source: CVE Program / CVE List V5
Vulnerability Title
Boa 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Boa是Boa开源的一种适用于嵌入式应用程序的开放源代码。 Boa 0.16至0.19.0之前版本存在安全漏洞，该漏洞源于允许攻击者通过精心构造的代码触发AsyncGenerator对象的状态转换，从而造成未捕获的异常，进而可能发起拒绝服务攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
boa-dev boa >= 0.16, < 0.19.0 -

II. Public POCs for CVE-2024-43367

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 5943 chars
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III. Intelligence Information for CVE-2024-43367

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Patches & Fixes for CVE-2024-43367 (1)

Vendor Advisories for CVE-2024-43367 (2)

IV. Related Vulnerabilities

Same weakness: CWE-248

V. Comments for CVE-2024-43367

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