CVE-2021-21284
Medium
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.
SeverityMedium
CVSS6.8
Exploit probability—
Product
Docker
PublishedFeb 2, 2021
First seenFeb 2, 2021
Weakness typeCWE-22Path traversal
How to fix
Update
- docker docker19.03.15, 20.10.3 or later
- github.com/moby/moby19.3.15, 20.10.3 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| docker docker | v < 19.03.15, 20.0.0 ≤ v < 20.10.3 | 19.03.15, 20.10.3 |
| debian debian_linux | 10.0 | — |
| netapp e-series_santricity_os_controller | 11.0.0 ≤ v ≤ 11.60.3 | — |
| github.com/moby/mobyGo | v < 19.3.15, 20.10.0-beta1 ≤ v < 20.10.3 | 19.3.15, 20.10.3 |
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