Cross Site Request Forgery in Dynamodb
How Cross Site Request Forgery Manifests in Dynamodb
Cross Site Request Forgery (CSRF) in Dynamodb environments occurs when attackers trick authenticated users into making unintended requests to Dynamodb endpoints. Unlike traditional web applications where CSRF targets HTTP endpoints, Dynamodb-specific CSRF attacks exploit the unique characteristics of AWS SDK client configurations and credential handling.
The most common attack vector involves client-side JavaScript that inherits AWS credentials from the browser's credential chain. When users are authenticated to AWS through Cognito, IAM roles, or federated identity providers, malicious scripts can execute DynamoDB operations without explicit user interaction. For example:
fetch('https://dynamodb.us-east-1.amazonaws.com/', {
method: 'POST',
headers: {'Content-Type': 'application/x-amz-json-1.0'},
body: JSON.stringify({
TableName: 'Users',
Item: {username: 'hacker', password: 'stolen'}
})
});This attack succeeds because the browser automatically includes AWS credentials in requests to signed endpoints. The same-origin policy doesn't protect against this since the request is to a legitimate AWS domain.
Another Dynamodb-specific CSRF pattern exploits misconfigured IAM policies that allow public access or overly permissive cross-account access. Attackers can craft requests that bypass traditional CSRF protections:
const docClient = new AWS.DynamoDB.DocumentClient({
region: 'us-east-1'
});
async function deleteUserData() {
await docClient.delete({
TableName: 'UserData',
Key: {userId: 'victimUserId'}
}).promise();
}Server-side request forgery (SSRF) combined with Dynamodb creates additional CSRF-like vulnerabilities. If an application accepts URLs and processes them server-side, attackers can force the server to make unauthorized Dynamodb requests using the server's credentials:
// Vulnerable SSRF pattern
app.post('/process-url', async (req, res) => {
const response = await fetch(req.body.url); // SSRF here
// Could be pointing to Dynamodb endpoint
});The lack of same-origin restrictions for AWS SDK requests means that even if your application has proper CSRF tokens for web forms, Dynamodb operations remain vulnerable through client-side SDK usage.
Dynamodb-Specific Detection
Detecting CSRF vulnerabilities in Dynamodb requires scanning for specific patterns that traditional web scanners miss. middleBrick's API security scanner identifies these Dynamodb-specific CSRF indicators through black-box testing and specification analysis.
The scanner tests for unauthenticated access to Dynamodb endpoints by attempting operations without proper authentication headers. It also analyzes OpenAPI specifications for missing CSRF protection mechanisms in API endpoints that interact with Dynamodb. Key detection patterns include:
| Detection Pattern | Risk Level | Typical Finding |
|---|---|---|
| Client-side SDK usage without CSRF tokens | High | JavaScript code making direct Dynamodb calls |
| Public IAM policies on Dynamodb tables | Critical | Wildcard permissions in IAM policies |
| Missing CORS restrictions on Dynamodb endpoints | Medium | Wildcard origins in CORS configuration |
| SSRF vulnerabilities that could target Dynamodb | High | URL parameters that aren't properly validated |
middleBrick's LLM/AI security module adds another layer of detection for AI-powered applications that use Dynamodb. These applications often have complex prompt injection vulnerabilities that can be combined with CSRF attacks:
// Example of AI application vulnerability
app.post('/chat', async (req, res) => {
const prompt = req.body.prompt;
The scanner specifically looks for patterns where AI models might generate or execute code that interacts with Dynamodb endpoints, creating a CSRF-like attack surface through prompt injection.
For comprehensive Dynamodb security assessment, middleBrick analyzes both the runtime behavior and the specification files. It resolves $ref references in OpenAPI specs to understand the complete API surface and identifies endpoints that lack proper authentication mechanisms for Dynamodb operations.
Dynamodb-Specific Remediation
Securing Dynamodb against CSRF attacks requires a defense-in-depth approach combining AWS-native security features with application-level protections. The first line of defense is proper credential management and policy configuration.
Instead of relying on browser-based credentials, use temporary credentials with short expiration times:
// Secure credential handling
const sts = new AWS.STS();
const credentials = await sts.getFederationToken({
Name: 'dynamodb-access',
Implement CSRF protection at the application level for any endpoints that trigger Dynamodb operations:
// Express middleware for CSRF protection
const csrf = require('csurf');
const csrfProtection = csrf({ cookie: true });
app.post('/api/dynamodb/operation', csrfProtection, async (req, res) => {
// CSRF token validated before any DynamoDB operation
Use AWS WAF with rate limiting and geographic restrictions to prevent automated CSRF attacks:
// AWS WAF configuration for DynamoDB API endpoints
const waf = new AWS.WAF();
await waf.createWebACL({
Name: 'DynamoDBCSRFProtection',
For serverless applications using Lambda with Dynamodb, implement custom authorizers that validate CSRF tokens before allowing database operations:
exports.handler = async (event) => {
const csrfToken = event.headers['X-CSRF-Token'];
Implement proper CORS policies that restrict which origins can access your Dynamodb-backed APIs:
// CORS configuration for API Gateway
const corsConfig = {
'Access-Control-Allow-Origin': 'https://yourdomain.com',
Finally, use middleBrick's continuous monitoring to ensure these protections remain effective. The Pro plan's scheduled scanning will detect if any new endpoints are added without proper CSRF protection, and the GitHub Action integration can fail deployments that introduce CSRF vulnerabilities.