CVE-2021-21284

Aliases:GHSA-7452-xqpj-6rpcDEBIAN-CVE-2021-21284CGA-37mv-6m92-r8vjCGA-3c76-7r5j-829pCGA-3g8h-jfjx-x7gcCGA-3jpq-6c6r-g6cvCGA-5wxq-xv9j-g223CGA-78p4-c6w5-vw82CGA-fj8x-rmpq-v8f9CGA-gqqp-gq9h-rhqjCGA-j8mq-2wcm-pqf8CGA-p953-hv8h-fp3jCGA-qhq4-2xpx-pr3qCGA-rcf4-jf43-jhm5CGA-w8m2-m4x2-76rqCGA-xpvx-rwhf-3fqr
Advisory lineage Upstream: 0 Downstream: 14
Modified
Published: 02 Feb 2021, 17:55
Last modified:03 Aug 2024, 18:09

Vulnerability Summary

Overall Risk (default)
medium
27/100
CVSS Score
6.8 MEDIUM
v3.1 (cve.org)
EPSS Score
1.06% LOW
1% probability +1.04%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

02 Feb 2021, 17:55
Published
Vulnerability first disclosed
03 Aug 2024, 18:09
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.8CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
  • v2.0•LOW•Score: 2.7AV:A/AC:L/Au:S/C:N/I:P/A:N

EPSS Trends

Current EPSS score: 1.06%• Percentile: 63%

Techniques & Countermeasures

  • CWE-22•Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

    The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Affected Systems

  • chainguard•docker-machine-driver-harvester

    < 1.0.4-r1 | < 1.0.5-r0

  • chainguard•py3-docker

    < 0

  • chainguard•py3.10-docker

    < 0

  • chainguard•py3.11-docker

    < 0

  • chainguard•py3.12-docker

    < 0

  • chainguard•py3.13-docker

    < 0

  • chainguard•rancher-machine

    < 0.15.0.137-r0

  • wolfi•docker-machine-driver-harvester

    < 1.0.4-r1 | < 1.0.5-r0

  • wolfi•py3-docker

    < 0

  • wolfi•py3.10-docker

    < 0

  • wolfi•py3.11-docker

    < 0

  • wolfi•py3.12-docker

    < 0

  • wolfi•py3.13-docker

    < 0

  • wolfi•rancher-machine

    < 0.15.0.137-r0

  • debian•docker.io

    < 20.10.3+dfsg1-1 | < 20.10.3+dfsg1-1 | < 20.10.3+dfsg1-1 | < 20.10.3+dfsg1-1

  • debian•debian_linux

    10.0

  • docker•docker

    < 19.03.15 | ≥ 20.0.0, < 20.10.3

  • github.com/moby•moby

    < 19.3.15 | ≥ 20.10.0-beta1, < 20.10.3

  • moby•moby

    < 19.03.15 | ≥ 20.0.0, < 20.10.3

  • netapp•e-series_santricity_os_controller

    ≥ 11.0.0, ≤ 11.60.3

References (11)