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CVE-2019-1002101

Published: 1 April 2019

The kubectl cp command allows copying files between containers and the user machine. To copy files from a container, Kubernetes creates a tar inside the container, 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. The untar function can both create and follow symbolic links. The issue is resolved in kubectl v1.11.9, v1.12.7, v1.13.5, and v1.14.0.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
kubernetes
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Ignored
(end of life)
disco Ignored
(end of life)
eoan Ignored
(end of life)
focal Needs triage

groovy Ignored
(end of life)
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy Needs triage

kinetic Ignored
(end of life, was needs-triage)
lunar Ignored
(end of life, was needs-triage)
mantic Ignored
(end of life, was needs-triage)
noble Needs triage

trusty Does not exist

upstream Not vulnerable
(debian: Vulnerable code introduced later)
xenial Does not exist

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N