CVE-2019-11251

kubectl cp allows symlink directory traversal

Severity Score

5.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The Kubernetes kubectl cp command in versions 1.1-1.12, and versions prior to 1.13.11, 1.14.7, and 1.15.4 allows a combination of two symlinks provided by tar output of a malicious container to place a file outside of the destination directory specified in the kubectl cp invocation. This could be used to allow an attacker to place a nefarious file using a symlink, outside of the destination tree.

El comando kubectl cp de Kubernetes en las versiones 1.1-1.12 y versiones anteriores a 1.13.11, 1.14.7 y 1.15.4, permite una combinación de dos enlaces simbólicos proporcionados mediante la salida tar de un contenedor malicioso para colocar un archivo fuera del directorio de destino especificado en la invocación de kubectl cp. Esto podría ser usado para permitir aun atacante colocar un archivo nefasto usando un enlace simbólico, fuera del árbol de destino.

*Credits: Erik Sjölund

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

High

Privileges Required

Low

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

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
2019-10-31 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-59: Improper Link Resolution Before File Access ('Link Following')
CWE-61: UNIX Symbolic Link (Symlink) Following

CAPEC

References (4)

URL	Tag	Source
https://github.com/kubernetes/kubernetes/issues/87773	Third Party Advisory
https://groups.google.com/d/msg/kubernetes-announce/YYtEFdFimZ4/nZnOezZuBgAJ	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2019-11251	2019-11-18
https://bugzilla.redhat.com/show_bug.cgi?id=1753495	2019-11-18

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"				>= 1.13.0 < 1.13.11 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.13.0 < 1.13.11"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				>= 1.14.0 < 1.14.7 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.14.0 < 1.14.7"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				>= 1.15.0 < 1.15.4 Search vendor "Kubernetes" for product "Kubernetes" and version " >= 1.15.0 < 1.15.4"		-		Affected
Kubernetes Search vendor "Kubernetes"		Kubernetes Search vendor "Kubernetes" for product "Kubernetes"				1.1-1.12 Search vendor "Kubernetes" for product "Kubernetes" and version "1.1-1.12"		-		Affected