fix: the lambda function performs dns record modific... in app.js

[anupamme]

Summary

Fix critical severity security issue in app.js.

Vulnerability

Field	Value
ID	V-001
Severity	CRITICAL
Scanner	multi_agent_ai
Rule	V-001
File	app.js:7
Assessment	Likely exploitable
Chain Complexity	3-step

Description: The Lambda function performs DNS record modifications via Route 53 without any authentication mechanism. There is no API key validation, JWT/token check, AWS Cognito authorizer, or IAM-based access control. Any caller who can reach the API Gateway endpoint can modify arbitrary DNS records.

Evidence

Exploitation scenario: Attacker discovers the API Gateway endpoint URL and sends unauthenticated HTTP GET request: GET /update?hosted_zone_id=Z1234567890ABC&record_name=victim.example.com.

Scanner confirmation: multi_agent_ai rule V-001 flagged this pattern.

Production code: This file is in the production codebase, not test-only code.

Threat Model Context

This is a Node.js library - vulnerabilities affect downstream consumers who use this package.

Changes

• app.js

Behavior Preservation

The change is scoped to 1 file on the vulnerable path; it only tightens handling of untrusted input and leaves valid inputs unaffected.

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Automated security fix by OrbisAI Security