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
| Link | Resource |
|---|---|
| https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c | Patch Third Party Advisory |
| https://docs.docker.com/engine/release-notes/#20103 | Release Notes Vendor Advisory |
| https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc | Third Party Advisory |
| https://github.com/moby/moby/releases/tag/v19.03.15 | Release Notes Third Party Advisory |
| https://github.com/moby/moby/releases/tag/v20.10.3 | Release Notes Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20210226-0005/ | Third Party Advisory |
| https://www.debian.org/security/2021/dsa-4865 | Third Party Advisory |
| https://security.gentoo.org/glsa/202107-23 | Patch Third Party Advisory |
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Information
Published : 2021-02-02 10:15
Updated : 2022-04-29 12:22
NVD link : CVE-2021-21284
Mitre link : CVE-2021-21284
JSON object : View
CWE
CWE-22
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
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Products Affected
debian
- debian_linux
netapp
- e-series_santricity_os_controller
docker
- docker