Privilege escalation in Kubernetes



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-11251
CWE-ID CWE-61
Exploitation vector Local
Public exploit N/A
Vulnerable software
 Kubernetes
Server applications / Frameworks for developing and running applications

Vendor Kubernetes

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) UNIX symbolic link following

EUVDB-ID: #VU22431

Risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-11251

CWE-ID: CWE-61 - UNIX Symbolic Link (Symlink) Following

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a symlink following issue in kubectl cp. A local user can create two symbolic links and overwrite files on the system with privileges of the application.

Successful exploitation of this vulnerability may result in privilege escalation.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Kubernetes: 1.13.0 rc1 - 1.15.3

CPE2.3 External links

https://github.com/kubernetes/kubernetes/pull/82143
https://github.com/kubernetes/kubernetes/pull/82143
https://github.com/kubernetes/kubernetes/pull/82384
https://github.com/kubernetes/kubernetes/pull/82502
https://github.com/kubernetes/kubernetes/pull/82503


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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