CVE-2024-43367 (GCVE-0-2024-43367)

Vulnerability from cvelistv5 – Published: 2024-08-15 20:38 – Updated: 2024-08-20 15:45
VLAI
Title
Boa has an uncaught exception when transitioning the state of `AsyncGenerator` objects
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-20 15:42 UTC
CWE
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
boa-dev boa Affected: >= 0.16, < 0.19.0
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boa boa Affected: 0 , ≤ 0.16 (custom)
Affected: 0 , ≤ 0.19.0 (custom)
    cpe:2.3:a:boa:boa:*:*:*:*:*:*:*:*
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