Directory Traversal Affecting docker.io package, versions <20.10.3+dfsg1-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.05% (19th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-DOCKERIO-1069847
  • published3 Feb 2021
  • disclosed2 Feb 2021

Introduced: 2 Feb 2021

CVE-2021-21284  (opens in a new tab)
CWE-22  (opens in a new tab)

How to fix?

Upgrade Debian:unstable docker.io to version 20.10.3+dfsg1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream docker.io package and not the docker.io package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Scores

version 3.1