CVEvulnerability

CVE-2021-21284

6.8 MEDIUM Published 2021-02-02 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-02-02
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.8 MEDIUM — CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
CVSS 3.1 ([email protected])
6.8 MEDIUM — CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
CVSS 2.0 ([email protected])
2.7 LOW — AV:A/AC:L/Au:S/C:N/I:P/A:N
Weaknesses
CWE-22

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.

Affected configurations

• docker docker (< 19.03.15) • docker docker (>= 20.0.0 < 20.10.3) • debian debian linux 10.0 • netapp e-series santricity os controller (>= 11.0.0 <= 11.60.3)

Related

Weakness · CWE (1)

  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory weakness

References