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Privilege Escalation Affecting github.com/moby/moby Open this link in a new tab package, versions <19.3.15 >=20.10.0-beta1 <20.10.3

0.0
high

  • Attack Complexity

    High

  • Confidentiality

    High

  • Integrity

    High

  • Availability

    High

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  • snyk-id

    SNYK-GOLANG-GITHUBCOMMOBYMOBY-1069900

  • published

    4 Feb 2021

  • disclosed

    3 Feb 2021

  • credit

    Alex Chapman, Alex Price, Nathan Burrell, Raúl Gomis, Chris Walz, Mark Adams, David Black, Brian Goff

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Introduced: 3 Feb 2021

CVE-2021-21284 Open this link in a new tab
CWE-264 Open this link in a new tab

How to fix?

Upgrade github.com/moby/moby to version 19.3.15, 20.10.3 or higher.

Overview

Affected versions of this package are vulnerable to Privilege Escalation. There is a vulnerability in Docker 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.