Trivy Operator SSRF via Unvalidated Webhook URL (CVE-2024-3618) Analysis and POC

SSRF via unvalidated alert-channel webhook URL Vulnerability Overview In Trivy Operator, when an unvalidated webhook URL is configured, attackers can trigger Server-Side Request Forgery (SSRF) by specifying custom webhook addresses. This vulnerability allows attackers to initiate arbitrary HTTP requests to internal networks, which can be exploited to probe internal services, read sensitive files, or perform other malicious operations. Scope of Impact Affected Component: Alert channel functionality of Trivy Operator Affected Versions: All versions supporting webhook alert channels (unfixed as of the release of CVE-2024-3618) Affected Targets: Kubernetes clusters where Trivy Operator is deployed with webhook alert channels enabled Severity: High (CVSS 4.5.2) Remediation 1. Immediate Actions: - Disable or remove unvalidated webhook alert channel configurations - Restrict webhook URLs to point only to trusted external addresses (e.g., via whitelist mechanisms) - Limit Pod access to external networks using Kubernetes NetworkPolicies 2. Long-term Fixes: - Wait for the official release of Trivy Operator versions containing the security patch - Implement the aforementioned temporary mitigations prior to upgrading - Review all existing webhook configurations in deployments to ensure their security 3. Monitoring and Detection: - Monitor for abnormal outbound HTTP requests (especially to internal IP ranges) - Enable log auditing to track webhook invocation behavior POC Code > Note: This POC is intended for security testing only; do not misuse it in production environments. In actual attacks, adversaries can leverage SSRF to read files like or access internal API services. Recommendations Regularly update Trivy Operator to the latest stable version Implement the principle of least privilege to restrict Pod network access Enforce strict review and approval processes for webhook configurations Consider using more secure alert channels (e.g., official integrations with Slack, PagerDuty, etc.)

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Trivy Operator SSRF via Unvalidated Webhook URL (CVE-2024-3618) Analysis and POC

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