CVE-2021-42343Critical· 9.8▾ MidnightWorkers for local Dask clusters mistakenly listened on public interfaces
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.6 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Exploit-prediction probability, daily snapshots since Jul 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
2.9%
2.9% → 3.0%
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).
distributed < 2021.10.0Upgrade to a patched release:
distributed 2021.10.0Connected by shared product, vendor, weakness, or advisory.