CVE-2019-11246

kubectl cp allows symlink directory traversal

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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 1.12.9, versions prior to 1.13.6, versions prior to 1.14.2, and versions 1.1, 1.2, 1.4, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10, 1.11.

El comando kubectl cp permite copiar archivos entre contenedores y la máquina del usuario. Para copiar archivos de un contenedor, Kubernetes ejecuta tar dentro del contenedor para crear un archivo tar, lo copia a través de la red y kubectl lo descomprime en la máquina del usuario. Si el binario tar en el contenedor es malicioso, podría ejecutar cualquier código y generar resultados inesperados y maliciosos. Un atacante podría usar esto para escribir archivos en cualquier ruta en la máquina del usuario cuando se llama a kubectl cp, limitado solo por los permisos del sistema del usuario local. Las versiones afectadas de Kubernetes incluyen versiones anteriores a la versión 1.12.9, versiones anteriores a la versión 1.13.6, versiones anteriores a la versión 1.14.2 y versiones 1.1, 1.2, 1.4, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.10, 1.11.

*Credits: Charles Holmes, Atredis Partners

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-04-17 CVE Reserved
2019-06-27 CVE Published
2023-11-08 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59: Improper Link Resolution Before File Access ('Link Following')
CWE-61: UNIX Symbolic Link (Symlink) Following

CAPEC

References (5)

URL	Tag	Source
https://groups.google.com/forum/#%21topic/kubernetes-security-announce/NLs2TGbfPdo	Mailing List
https://security.netapp.com/advisory/ntap-20190919-0003	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://github.com/kubernetes/kubernetes/pull/76788	2023-11-07

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2019-11246	2019-07-24
https://bugzilla.redhat.com/show_bug.cgi?id=1721704	2019-07-24

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				>= 1.0.0 <= 1.12.10 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.0.0 <= 1.12.10"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				>= 1.13.0 < 1.13.9 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.13.0 < 1.13.9"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				>= 1.14.0 < 1.14.5 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.14.0 < 1.14.5"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				>= 1.15.0 < 1.15.2 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.15.0 < 1.15.2"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				1.12.11 Search vendor "Kubernetes" for product "Kubernetes" and version "1.12.11"		beta0		Affected