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[email protected]CVE-2021-21284

HistoryFeb 02, 2021 - 6:15 p.m.

CVE-2021-21284

2021-02-0218:15:11

CWE-22

[email protected]

web.nvd.nist.gov

227

cve-2021-21284

docker

privilege escalation

vulnerability

security

userns-remap

namespace

access control

nvd

2.7 Low

CVSS2

Attack Vector

ADJACENT_NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:A/AC:L/Au:S/C:N/I:P/A:N

6.8 Medium

CVSS3

Attack Vector

ADJACENT

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

6.8 Medium

AI Score

Confidence

High

0.0005 Low

EPSS

Percentile

17.4%

JSON

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.

Affected configurations

Vulners

NVD

Node

mobymobyRange<19.03.15

mobymobyRange20.0.0–20.10.3

CPENameOperatorVersion
docker:dockerdockerlt19.03.15
docker:dockerdockerlt20.10.3

CPE	Name	Operator	Version
docker:docker	docker	lt	19.03.15
docker:docker	docker	lt	20.10.3

CNA Affected

[
  {
    "product": "moby",
    "vendor": "moby",
    "versions": [
      {
        "status": "affected",
        "version": "< 19.03.15"
      },
      {
        "status": "affected",
        "version": ">= 20.0.0, < 20.10.3"
      }
    ]
  }
]