medium6.8
CVE-2021-21284
moby Access to remapped root allows privilege escalation to real root
Impact
### 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
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/moby/moby | < 19.3.15 | 19.3.15 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Docker | Docker | before 19.03.15 from 20.0.0 before 20.10.3 |
| Debian | Debian Linux | Version 10.0 |
| Netapp | E-Series Santricity Os Controller | from 11.0.0 through 11.60.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://docs.docker.com/engine/release-notes/#20103
- https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c
- https://github.com/moby/moby/releases/tag/v19.03.15
- https://github.com/moby/moby/releases/tag/v20.10.3
- https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc
- https://security.gentoo.org/glsa/202107-23
- https://security.netapp.com/advisory/ntap-20210226-0005/
- https://www.debian.org/security/2021/dsa-4865
- https://github.com/advisories/GHSA-7452-xqpj-6rpc
- https://nvd.nist.gov/vuln/detail/CVE-2021-21284
- https://security.netapp.com/advisory/ntap-20210226-0005