privilege escalation in Moby
Vulnerability 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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
Am I Vulnerable?
Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-21284
Credits & Attribution
No credits recorded in the NVD database.
References
- https://docs.docker.com/engine/release-notes/#20103
- https://github.com/moby/moby/releases/tag/v20.10.3
- https://github.com/moby/moby/releases/tag/v19.03.15
- https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc
- https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c
- https://security.netapp.com/advisory/ntap-20210226-0005/
- https://www.debian.org/security/2021/dsa-4865
- https://security.gentoo.org/glsa/202107-23
More from moby
View All →Affected Vendor
moby
View all reports →