XXE in Kubernetes
CVE-2019-11253
Improper input validation in the Kubernetes API server in versions v1.0-1.12 and versions prior to v1.13.12, v1.14.8, v1.15.5, and v1.16.2 allows authorized users to send malicious YAML or JSON payloads, causing the API server to consume excessive CPU or memory, potentially crashing and becoming unavailable. Prior to v1.14.0, default RBAC policy authorized anonymous users to submit requests that could trigger this vulnerability. Clusters upgraded from a version prior to v1.14.0 keep the more permissive policy by default for backwards compatibility.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
EPSS: 0.259 (97.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Kubernetes — versions prior to 1.13.12, prior to 1.14.8, prior to 1.15.5
- Redhat Openshift_container_platform — versions 3.9, 3.10, 3.11
Weakness classification (CWE)
Public proof-of-concept exploits
- 20142995/nuclei-templates
- ARPSyndicate/cve-scores
- ARPSyndicate/cvemon
- Metarget/cloud-native-security-book
- Metarget/metarget
- adavarski/HomeLab-Proxmox-k8s-DevSecOps-playground
- adavarski/HomeLab-k8s-DevSecOps-playground
- alphaSeclab/sec-daily-2019
- cloudnative-security/hacking-kubernetes
- cyb3r-w0lf/nuclei-template-collection
References
- jordan@liggitt.net (x_refsource_CONFIRM, Exploit, Third Party Advisory, Mitigation, Issue Tracking)
- jordan@liggitt.net (mailing-list, Permissions Required, x_refsource_MLIST)
- jordan@liggitt.net (x_refsource_REDHAT, vendor-advisory, Third Party Advisory)
- jordan@liggitt.net (x_refsource_CONFIRM, Third Party Advisory)
- jordan@liggitt.net (x_refsource_REDHAT, vendor-advisory, Third Party Advisory)
- jordan@liggitt.net (x_refsource_REDHAT, vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-11253?
- CVE-2019-11253 is a high-severity vulnerability in Kubernetes, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2019-10-17.
- How severe is CVE-2019-11253?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2019-11253 known to be exploited?
- 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.