CVE-2019-11253 PoC — Kubernetes API Server JSON/YAML parsing vulnerable to resource exhaustion attack

Source

https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2019/CVE-2019-11253.yaml

Associated Vulnerability

Title:Kubernetes API Server JSON/YAML parsing vulnerable to resource exhaustion attack (CVE-2019-11253)
Description: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.

Description

The Kubernetes API server is vulnerable to a denial of service attack via YAML/JSON parsing. An attacker can send a specially crafted YAML/JSON payload that causes exponential memory consumption (Billion Laughs attack), leading to API server crash.

File Snapshot


 id: CVE-2019-11253

info:
  name: Kubernetes API Server - YAML Parsing DoS (Billion Laughs)
  author

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