CVE-2021-41089 `docker cp` allows unexpected chmod of host files

2021-10-0420:20:15

CWE-281

GitHub_M

www.cve.org

cve-2021-41089

moby

docker engine

unexpected chmod

`docker cp`

unix file permission

software containerization

CVSS3

2.8

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

LOW

Integrity Impact

NONE

Availability Impact

NONE

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

AI Score

Confidence

High

EPSS

0.001

Percentile

17.5%

JSON

Moby is an open-source project created by Docker to enable software containerization. A bug was found in Moby (Docker Engine) where attempting to copy files using docker cp into a specially-crafted container can result in Unix file permission changes for existing files in the host’s filesystem, widening access to others. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process. This bug has been fixed in Moby (Docker Engine) 20.10.9. Users should update to this version as soon as possible. Running containers do not need to be restarted.

CNA Affected

[
  {
    "product": "moby",
    "vendor": "moby",
    "versions": [
      {
        "status": "affected",
        "version": "< 20.10.9"
      }
    ]
  }
]