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

1976-01-0100:00:00

CWE-20

kubernetes

github.com

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

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.

CNA Affected

[
  {
    "vendor": "Kubernetes",
    "product": "Kubernetes",
    "versions": [
      {
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom",
        "lessThanOrEqual": "1.19.14"
      },
      {
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom",
        "lessThanOrEqual": "1.20.10"
      },
      {
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom",
        "lessThanOrEqual": "1.21.4"
      },
      {
        "status": "affected",
        "version": "unspecified",
        "versionType": "custom",
        "lessThanOrEqual": "1.22.1"
      }
    ]
  }
]

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"
  }
]