CVE-2019-11249 kubectl cp allows symlink directory traversal

2019-08-0500:00:00

CWE-61

kubernetes

www.cve.org

4.8 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.0/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:N

7 High

AI Score

Confidence

High

0.002 Low

EPSS

Percentile

56.0%

JSON

The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes runs tar inside the container to create a tar archive, copies it over the network, and kubectl unpacks it on the user’s machine. If the tar binary in the container is malicious, it could run any code and output unexpected, malicious results. An attacker could use this to write files to any path on the user’s machine when kubectl cp is called, limited only by the system permissions of the local user. Kubernetes affected versions include versions prior to 1.13.9, versions prior to 1.14.5, versions prior to 1.15.2, and versions 1.1, 1.2, 1.4, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10, 1.11, 1.12.

CNA Affected

[
  {
    "product": "Kubernetes",
    "vendor": "Kubernetes",
    "versions": [
      {
        "status": "affected",
        "version": "prior to 1.13.9"
      },
      {
        "status": "affected",
        "version": "prior to 1.14.5"
      },
      {
        "status": "affected",
        "version": "prior to 1.15.2"
      },
      {
        "status": "affected",
        "version": "1.1"
      },
      {
        "status": "affected",
        "version": "1.2"
      },
      {
        "status": "affected",
        "version": "1.4"
      },
      {
        "status": "affected",
        "version": "1.5"
      },
      {
        "status": "affected",
        "version": "1.6"
      },
      {
        "status": "affected",
        "version": "1.7"
      },
      {
        "status": "affected",
        "version": "1.8"
      },
      {
        "status": "affected",
        "version": "1.9"
      },
      {
        "status": "affected",
        "version": "1.10"
      },
      {
        "status": "affected",
        "version": "1.11"
      },
      {
        "status": "affected",
        "version": "1.12"
      }
    ]
  }
]