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CVE

RUSTSEC-2024-0444

Uncaught exception when transitioning the state of `AsyncGenerator` objects from within a property getter of `then`
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CVE

RUSTSEC-2024-0444

Uncaught exception when transitioning the state of `AsyncGenerator` objects from within a property getter of `then`

A wrong assumption made when handling ECMAScript's AsyncGenerator operations

can cause an uncaught exception on certain scripts.

Details

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.

Patches

Version 0.19.0 is patched to correctly handle this case.

Workarounds

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
-
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
C
H
U
-

Related Resources

No items found.

References

https://crates.io/crates/boa_engine, https://rustsec.org/advisories/RUSTSEC-2024-0444.html, https://github.com/boa-dev/boa/security/advisories/GHSA-f67q-wr6w-23jq, https://nvd.nist.gov/vuln/detail/CVE-2024-43357, https://github.com/boa-dev/boa/commit/69ea2f52ed976934bff588d6b566bae01be313f7

Severity

8.6

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
8.6
EPSS Probability
0%
EPSS Percentile
0%
Introduced Version
0.16.0
Fix Available
0.19.0

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