Products
Boa Javascript engine
- 0.16 - 0.18.9
Source
security-advisories@github.com
Tags
CVE-2024-43367 details
Last Modified : Aug. 15, 2024, 9:15 p.m.
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.
CVSS Score
1 | 2 | 3 | 4 | 5 | 6 | 7.5 | 8 | 9 | 10 |
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Weakness
Weakness | Name | Description |
---|---|---|
CWE-248 | Uncaught Exception | An exception is thrown from a function, but it is not caught. |
CVSS Data
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Base Score
7.5
Exploitability Score
3.9
Impact Score
3.6
Base Severity
HIGH
Vector String : CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
URL | Source |
---|---|
https://github.com/boa-dev/boa/commit/69ea2f52ed976934bff588d6b566bae01be313f7 | security-advisories@github.com |
https://github.com/boa-dev/boa/security/advisories/GHSA-f67q-wr6w-23jq | security-advisories@github.com |
https://github.com/tc39/ecma262/security/advisories/GHSA-g38c-wh3c-5h9r | security-advisories@github.com |