Vulnerability Details : CVE-2021-21284
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.
Vulnerability category: Directory traversalGain privilege
Products affected by CVE-2021-21284
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
- Netapp » E-series Santricity Os ControllerVersions from including (>=) 11.0.0 and up to, including, (<=) 11.60.3cpe:2.3:a:netapp:e-series_santricity_os_controller:*:*:*:*:*:*:*:*
- cpe:2.3:a:docker:docker:*:*:*:*:*:*:*:*
- cpe:2.3:a:docker:docker:*:*:*:*:*:*:*:*
Threat overview for CVE-2021-21284
Top countries where our scanners detected CVE-2021-21284
Top open port discovered on systems with this issue
22
IPs affected by CVE-2021-21284 688
Threat actors abusing to this issue?
Yes
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Exploit prediction scoring system (EPSS) score for CVE-2021-21284
0.02%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 5 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-21284
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.7
|
LOW | AV:A/AC:L/Au:S/C:N/I:P/A:N |
5.1
|
2.9
|
NIST | |
|
6.8
|
MEDIUM | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N |
2.3
|
4.0
|
NIST | |
|
6.8
|
MEDIUM | CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N |
2.3
|
4.0
|
GitHub, Inc. |
CWE ids for CVE-2021-21284
-
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.Assigned by:
- nvd@nist.gov (Primary)
- security-advisories@github.com (Secondary)
References for CVE-2021-21284
-
https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc
Access to remapped root allows privilege escalation to real root · Advisory · moby/moby · GitHubThird Party Advisory
-
https://docs.docker.com/engine/release-notes/#20103
Docker Engine release notes | Docker DocumentationRelease Notes;Vendor Advisory
-
https://github.com/moby/moby/releases/tag/v20.10.3
Release v20.10.3 · moby/moby · GitHubRelease Notes;Third Party Advisory
-
https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c
Merge pull request #41964 from thaJeztah/CVE-2021-21284_master · moby/moby@64bd448 · GitHubPatch;Third Party Advisory
-
https://security.gentoo.org/glsa/202107-23
Docker: Multiple vulnerabilities (GLSA 202107-23) — Gentoo securityPatch;Third Party Advisory
-
https://github.com/moby/moby/releases/tag/v19.03.15
Release v19.03.15 · moby/moby · GitHubRelease Notes;Third Party Advisory
-
https://www.debian.org/security/2021/dsa-4865
Debian -- Security Information -- DSA-4865-1 docker.ioThird Party Advisory
-
https://security.netapp.com/advisory/ntap-20210226-0005/
February 2021 Docker Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
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