GHSA-7452-xqpj-6rpc
moby Access to remapped root allows privilege escalation to real root
Quick fix
GHSA-7452-xqpj-6rpc — github.com/moby/moby: upgrade to the fixed version with the command below.
go get github.com/moby/moby@v19.3.15Details
### Impact
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.
### Patches
Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.
### Credits
Maintainers would like to thank Alex Chapman for discovering the vulnerability; @awprice, @nathanburrell, @raulgomis, @chris-walz, @erin-jensby, @bassmatt, @mark-adams, @dbaxa for working on it and Zac Ellis for responsibly disclosing it to security@docker.com
Are you affected?
Enter the version of the package you're using.
Affected packages
20.10.0-beta1Fixed in: 20.10.3go get github.com/moby/moby@v20.10.3References
- https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc[WEB]
- https://nvd.nist.gov/vuln/detail/CVE-2021-21284[ADVISORY]
- https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c[WEB]
- https://docs.docker.com/engine/release-notes/#20103[WEB]
- https://github.com/moby/moby/releases/tag/v19.03.15[WEB]
- https://github.com/moby/moby/releases/tag/v20.10.3[WEB]
- https://security.gentoo.org/glsa/202107-23[WEB]
- https://security.netapp.com/advisory/ntap-20210226-0005[WEB]
- https://www.debian.org/security/2021/dsa-4865[WEB]