Bug 2018587 (CVE-2021-42343)

Summary:	CVE-2021-42343 python-dask: workers listen on external interfaces rather than only localhost
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED UPSTREAM	QA Contact:
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	unspecified	CC:	python-sig, quantum.analyst
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
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Fixed In Version:		Doc Type:	If docs needed, set a value
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Last Closed:	2021-10-29 20:08:12 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2018588
Bug Blocks:

Description Guilherme de Almeida Suckevicz 2021-10-29 18:31:28 UTC

An issue was discovered in Dask (aka python-dask) through 2021.09.1. 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.

Reference:
https://docs.dask.org/en/latest/changelog.html

Comment 1 Guilherme de Almeida Suckevicz 2021-10-29 18:31:42 UTC

Created python-dask tracking bugs for this issue:

Affects: fedora-all [bug 2018588]

Comment 2 Product Security DevOps Team 2021-10-29 20:08:12 UTC

This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.