GitHub Advisoryadvisory · PyPI

GHSA-hwqr-f3v9-hwxr Workers for local Dask clusters mistakenly listened on public interfaces

CRITICAL Published 2022-07-15 Modified 2026-02-03 Official page ↗
Aliases
CVE-2021-42343
Ecosystem
PyPI
Packages
distributed
Severity
Critical
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-668
Reviewed
2022-07-15

Affected packages

• PyPI distributed: < 2021.10.0 → fixed in 2021.10.0

Description

Versions of `distributed` earlier than `2021.10.0` had a potential security vulnerability relating to single-machine Dask clusters. 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 AND running on a machine that has these ports exposed could be used by a sophisticated attacker to enable remote code execution. Users running on machines with standard firewalls in place, or using clusters created via cluster objects other than `LocalCluster` (e.g. `dask_kubernetes.KubeCluster`) should not be affected. This vulnerability is documented in CVE-2021-42343, and was fixed in version `2021.10.0` (PR #5427).

Related

Alias · CVE (1)

  • CVE-2021-42343 An issue was discovered in the Dask distributed package before 2021.10.0 for Python. vulnerability

Weakness · CWE (1)

  • CWE-668 Exposure of Resource to Wrong Sphere weakness

References