CVE - CVE-2021-21284

CVE-ID
CVE-2021-21284	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In Docker before versions 9.03.15, 20.10.3 there is a vulnerability involving the --userns-remap option in which access to remapped root allows privilege escalation to real root. When using "--userns-remap", if the root user in the remapped namespace has access to the host filesystem they can modify files under "/var/lib/docker/<remapping>" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
CONFIRM:https://security.netapp.com/advisory/ntap-20210226-0005/ CONFIRM:https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc URL:https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc DEBIAN:DSA-4865 URL:https://www.debian.org/security/2021/dsa-4865 GENTOO:GLSA-202107-23 URL:https://security.gentoo.org/glsa/202107-23 MISC:https://docs.docker.com/engine/release-notes/#20103 URL:https://docs.docker.com/engine/release-notes/#20103 MISC:https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c URL:https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c MISC:https://github.com/moby/moby/releases/tag/v19.03.15 URL:https://github.com/moby/moby/releases/tag/v19.03.15 MISC:https://github.com/moby/moby/releases/tag/v20.10.3 URL:https://github.com/moby/moby/releases/tag/v20.10.3
Assigning CNA
GitHub (maintainer security advisories)
Date Record Created
20201222	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20201222)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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