Security Features in Kubernetes - CVE-2019-9946

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Main Vulnerability Database Vulnerabilities #VU31125

Security Features in Kubernetes - CVE-2019-9946

Published: April 2, 2019 / Updated: July 17, 2020


Vulnerability identifier: #VU31125
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2019-9946
CWE-ID: CWE-254
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Kubernetes
Affected software:
Kubernetes

Detailed vulnerability description

The vulnerability allows a remote non-authenticated attacker to manipulate data.

Cloud Native Computing Foundation (CNCF) CNI (Container Networking Interface) 0.7.4 has a network firewall misconfiguration which affects Kubernetes. The CNI 'portmap' plugin, used to setup HostPorts for CNI, inserts rules at the front of the iptables nat chains; which take precedence over the KUBE- SERVICES chain. Because of this, the HostPort/portmap rule could match incoming traffic even if there were better fitting, more specific service definition rules like NodePorts later in the chain. The issue is fixed in CNI 0.7.5 and Kubernetes 1.11.9, 1.12.7, 1.13.5, and 1.14.0.


How to mitigate CVE-2019-9946

Install update from vendor's website.

Sources