THREATPORT/VULNERABILITY/CVE-2019-9946
HIGH SEVERITY

CVE-2019-9946

Portmap vulnerability

CVSS
7.5
EPSS
3.1%
EPSS pct
86th
Exploited
No known
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.
Affected vendor
Cncf
Affected product
Portmap
CVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness type (CWE)
  • CWE-670 — Always-Incorrect Control Flow Implementation
Published
2019-04-02

Risk analysis

Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no privileges, no user interaction. Successful exploitation leads to high impact to integrity.

Its EPSS score of 3.1% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 86% of all scored CVEs.

Check your external exposure to CVE-2019-9946

  • Confirm whether Cncf Portmap is running on any internet-facing host or subdomain.
  • Match discovered service fingerprints against the version affected by CVE-2019-9946.
  • Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.

How ThreatPort helps with CVE-2019-9946

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