Directory Traversal Affecting rancher-machine package, versions <0.15.0.137-r0


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.02% (6th percentile)

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  • Snyk IDSNYK-WOLFILATEST-RANCHERMACHINE-15411349
  • published5 Mar 2026
  • 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 Wolfi rancher-machine to version 0.15.0.137-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rancher-machine package and not the rancher-machine package as distributed by Wolfi. See How to fix? for Wolfi 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 Base Scores

version 3.1