CVE-2021-42343: Workers for local Dask clusters mistakenly listened on public interfaces
(updated )
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
- docs.dask.org/en/latest/changelog.html
- github.com/advisories/GHSA-hwqr-f3v9-hwxr
- github.com/dask/dask/tags
- github.com/dask/distributed
- github.com/dask/distributed/commit/afce4be8e05fb180e50a9d9e38465f1a82295e1b
- github.com/dask/distributed/pull/5427
- github.com/dask/distributed/security/advisories/GHSA-hwqr-f3v9-hwxr
- github.com/pypa/advisory-database/tree/main/vulns/distributed/PYSEC-2021-871.yaml
- github.com/pypa/advisory-database/tree/main/vulns/distributed/PYSEC-2021-872.yaml
- nvd.nist.gov/vuln/detail/CVE-2021-42343
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