CVE-2021-21284

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.

Weakness classification

• security-advisories@github.com: CWE-22
• nvd@nist.gov: CWE-22

Primary references

• security-advisories@github.com — Release Notes, Vendor Advisory
• security-advisories@github.com — Patch, Third Party Advisory
• security-advisories@github.com — Release Notes, Third Party Advisory
• security-advisories@github.com — Release Notes, Third Party Advisory
• security-advisories@github.com — Third Party Advisory
• security-advisories@github.com — Patch, Third Party Advisory
• security-advisories@github.com — Third Party Advisory
• security-advisories@github.com — Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Patch, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Third Party Advisory
• af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Third Party Advisory