GHSA-hwqr-f3v9-hwxr

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GHSA-hwqr-f3v9-hwxr

Summary: Workers for local Dask clusters mistakenly listened on public interfaces

Details: 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).

References: https://github.com/dask/distributed/security/advisories/GHSA-hwqr-f3v9-hwxr, https://nvd.nist.gov/vuln/detail/CVE-2021-42343, https://github.com/dask/distributed/pull/5427, https://github.com/dask/distributed/commit/afce4be8e05fb180e50a9d9e38465f1a82295e1b, https://docs.dask.org/en/latest/changelog.html, https://github.com/dask/dask/tags, https://github.com/dask/distributed, https://github.com/pypa/advisory-database/tree/main/vulns/distributed/PYSEC-2021-871.yaml, https://github.com/pypa/advisory-database/tree/main/vulns/distributed/PYSEC-2021-872.yaml