CVE-2020-27352

2024-06-2120:15:10

[email protected]

web.nvd.nist.gov

snapd

systemd

service units

docker

cgroup

privilege escalation

cve-2020-27352

9.3 High

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

9.2 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

15.7%

JSON

When generating the systemd service units for the docker snap (and other similar snaps), snapd does not specify Delegate=yes - as a result systemd will move processes from the containers created and managed by these snaps into the cgroup of the main daemon within the snap itself when reloading system units. This may grant additional privileges to a container within the snap that were not originally intended.

CNA Affected

[
  {
    "packageName": "snapd",
    "product": "snapd",
    "vendor": "Canonical Ltd.",
    "repo": "https://github.com/snapcore/snapd",
    "platforms": [
      "Linux"
    ],
    "versions": [
      {
        "lessThan": "2.48.3",
        "status": "affected",
        "version": "0",
        "versionType": "semver"
      }
    ]
  }
]