#VU30806 Permissions, Privileges, and Access Controls in Kubernetes - CVE-2019-11249
Vulnerability identifier: #VU30806
Vulnerability risk: Medium
CVSSv4.0: 4.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID:
CWE-ID:
CWE-264
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Kubernetes
Server applications /
Frameworks for developing and running applications
Vendor: Kubernetes
Description
The vulnerability allows a remote non-authenticated attacker to manipulate data.
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.
Mitigation
Install update from vendor's website.
Vulnerable software versions
Kubernetes: 1.15.0 - 1.15.1
External links
https://access.redhat.com/errata/RHBA-2019:2794
https://access.redhat.com/errata/RHBA-2019:2816
https://access.redhat.com/errata/RHBA-2019:2824
https://access.redhat.com/errata/RHSA-2019:3239
https://access.redhat.com/errata/RHSA-2019:3811
https://github.com/kubernetes/kubernetes/issues/80984
https://groups.google.com/d/msg/kubernetes-security-announce/vUtEcSEY6SM/v2ZZxsmtFQAJ
https://security.netapp.com/advisory/ntap-20190919-0003/
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
