CVE-2021-42343

medium

Published 2022-07-15 · Modified 2023-11-08

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CVSS v3

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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4 NEW

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not yet in upstream

VIR risk

5.5

Description

An issue was discovered in the Dask distributed package before 2021.10.0 for Python. Single machine Dask clusters started with dask.distributed.LocalCluster or dask.distributed.Client (which defaults to using LocalCluster) would mistakenly configure their respective Dask workers to listen on external interfaces (typically with a randomly selected high port) rather than only on localhost. A Dask cluster created using this method (when running on a machine that has an applicable port exposed) could be used by a sophisticated attacker to achieve remote code execution.

Predictions

Exploit likelihood

30%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

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OS impact

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`2021.10.0-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`2021.09.1+ds.1-2`
sid	Fixed	`2021.09.1+ds.1-2`
forky	Fixed	`2021.09.1+ds.1-2`
bullseye	Fixed	`2021.01.0+ds.1-2.1+deb11u1`
bookworm	Fixed	`2021.09.1+ds.1-2`

Package impact

Ecosystem	Package	Vulnerable	Fixed
PyPI	distributed	`<2021.10.0`	`2021.10.0`
PyPI	dask	`<2021.10.0`	`2021.10.0`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.