CVE-2021-25741 Symlink Exchange Can Allow Host Filesystem Access

2021-09-2017:05:21

CWE-20

kubernetes

github.com

kubernetes

security issue

container access

host filesystem

subpath volume mounts

CVSS3

8.8

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

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

AI Score

6.6

Confidence

Low

EPSS

0.001

Percentile

41.9%

SSVC

Exploitation

none

Automatable

Technical Impact

total

JSON

A security issue was discovered in Kubernetes where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*"
    ],
    "vendor": "kubernetes",
    "product": "kubernetes",
    "versions": [
      {
        "status": "affected",
        "version": "0",
        "versionType": "custom",
        "lessThanOrEqual": "1.19.14"
      },
      {
        "status": "affected",
        "version": "1.20.0",
        "versionType": "custom",
        "lessThanOrEqual": "1.20.10"
      },
      {
        "status": "affected",
        "version": "1.21.0",
        "versionType": "custom",
        "lessThanOrEqual": "1.21.4"
      },
      {
        "status": "affected",
        "version": "1.22.0",
        "versionType": "custom",
        "lessThanOrEqual": "1.22.1"
      }
    ],
    "defaultStatus": "unknown"
  }
]