CVE-2019-11253 — AI Deep Analysis Summary

🚨 **Denial of Service (DoS) via YAML/JSON Parsing** * **Essence:** The Kubernetes API server fails to validate input data correctly. * **Attack Vector:** Attackers send specially crafted YAML/JSON payloads. * **Me…

🛡️ **CWE-20: Improper Input Validation** * **Flaw:** The system does not properly verify or sanitize incoming data. * **Specific Issue:** Lack of protection against recursive entity expansion in parsers. * **Resul…

📦 **Affected Versions** * **Product:** Google Kubernetes / Kubernetes API Server. * **Vulnerable Ranges:** * v1.0 to v1.12 * v1.13.x before v1.13.12 * v1.14.x before v1.14.8 * Older versions …

💣 **Impact: Availability Only** * **Privileges:** No code execution or data theft directly. * **Data:** No direct data exfiltration (C:N in CVSS). * **Action:** Hackers can crash the API server. * **Goal:** Deni…

🔓 **Low Exploitation Threshold** * **Auth:** `PR:N` (Privileges Required: None). No authentication needed. * **UI:** `UI:N` (User Interaction: None).…

🔍 **Public PoC Available** * **Status:** Yes, Proof of Concept exists. * **Source:** ProjectDiscovery Nuclei Templates. * **Link:** `nuclei-templates/http/cves/2019/CVE-2019-11253.yaml`. * **Wild Exploit:** Like…

🔎 **Self-Check Methods** * **Scan:** Use Nuclei with the specific CVE template. * **Check:** Verify your Kubernetes API Server version. * **Monitor:** Watch for high memory usage spikes in API pods. * **Input:**…

🛠️ **Official Fix Available** * **Patch:** Upgrade Kubernetes to fixed versions. * **Target Versions:** * v1.13.12+ * v1.14.8+ * **Vendor:** Google/Kubernetes community released patches. * **Advisori…

🚧 **Mitigation if No Patch** * **WAF:** Deploy Web Application Firewall to block malicious YAML/JSON structures. * **Rate Limiting:** Limit request rates to the API server. * **Resource Limits:** Set strict memory…

🔥 **High Urgency** * **Priority:** Critical for Availability. * **Reason:** Remote, unauthenticated, easy DoS. * **Action:** Patch immediately if running vulnerable versions. * **Risk:** Cluster downtime affects…