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CVE-2021-21284
Detail
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.
Metrics
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OR
*cpe:2.3:a:docker:docker:*:*:*:*:*:*:*:* versions up to (excluding) 19.03.15
*cpe:2.3:a:docker:docker:*:*:*:*:*:*:*:* versions from (including) 20.0.0 up to (excluding) 20.10.3
Added
CVSS V2
NIST (AV:A/AC:L/Au:S/C:N/I:P/A:N)
Added
CVSS V3.1
NIST AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
Changed
Reference Type
https://docs.docker.com/engine/release-notes/#20103 No Types Assigned
https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c No Types Assigned
https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c Patch, Third Party Advisory
Changed
Reference Type
https://github.com/moby/moby/releases/tag/v19.03.15 No Types Assigned
https://github.com/moby/moby/releases/tag/v19.03.15 Release Notes, Third Party Advisory
Changed
Reference Type
https://github.com/moby/moby/releases/tag/v20.10.3 No Types Assigned
https://github.com/moby/moby/releases/tag/v20.10.3 Release Notes, Third Party Advisory
Changed
Reference Type
https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc No Types Assigned
https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc Third Party Advisory
CVE Modified by GitHub, Inc.2/02/2021 2:15:14 PM
Action
Type
Old Value
New Value
Changed
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.
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.
Quick Info
CVE Dictionary Entry: CVE-2021-21284 NVD
Published Date: 02/02/2021 NVD
Last Modified: 04/29/2022
Source: GitHub, Inc.
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