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 Subscribe |
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
CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2019-11251
CWE-ID:
CWE-61 - UNIX Symbolic Link (Symlink) Following
Exploit availability: No
DescriptionThe 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.
MitigationInstall updates from vendor's website.
Vulnerable software versionsKubernetes: 1.13.0 - 1.15.3
External linkshttp://github.com/kubernetes/kubernetes/pull/82143
http://github.com/kubernetes/kubernetes/pull/82143
http://github.com/kubernetes/kubernetes/pull/82384
http://github.com/kubernetes/kubernetes/pull/82502
http://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.
