You are viewing this page in an unauthorized frame window.
This is a potential security issue, you are being redirected to
https://nvd.nist.gov
An official website of the United States government
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
NIST has updated the
NVD program announcement page with additional information regarding
recent concerns and the temporary delays in enrichment efforts.
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.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: The NVD and the CNA have provided the same score. When this occurs only the CNA information is displayed, but the Acceptance Level icon for the CNA is given a checkmark to signify NVD concurrence.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving NIST webspace.
We have provided these links to other web sites because they
may have information that would be of interest to you. No
inferences should be drawn on account of other sites being
referenced, or not, from this page. There may be other web
sites that are more appropriate for your purpose. NIST does
not necessarily endorse the views expressed, or concur with
the facts presented on these sites. Further, NIST does not
endorse any commercial products that may be mentioned on
these sites. Please address comments about this page to nvd@nist.gov.
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.
) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.
