CVE-2021-21284

 

Published at: - 02-02-2021 07:15

Last modified: - 29-04-2022 09:22

Total changes: - 7

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

 

Verification logic

 

Reference

• https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c
• https://docs.docker.com/engine/release-notes/#20103
• https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc
• https://github.com/moby/moby/releases/tag/v19.03.15
• https://github.com/moby/moby/releases/tag/v20.10.3
• https://security.netapp.com/advisory/ntap-20210226-0005/
• DSA-4865-Third Party Advisory
• GLSA-202107-23-Patch, Third Party Advisory

 

Keywords

NVD

 

CVE-2021-21284

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures