Credential Stuffing in Strapi with Dynamodb

Credential stuffing is an automated attack where previously breached username and password pairs are replayed against an authentication endpoint to exploit reused credentials. When Strapi uses DynamoDB as its data store, the risk profile is shaped by how Strapi’s authentication layer interacts with DynamoDB and how DynamoDB is configured to handle requests.

Strapi’s default local provider supports user registration, password hashing, and session-based authentication. If rate limiting or account lockout is not explicitly enforced, an attacker can submit many credential guesses against the /auth/local endpoint without triggering defensive controls. DynamoDB, by default, does not enforce request-rate caps at the table level in the same way a relational database might; instead, it relies on provisioned or on-demand capacity and partition-key design. If the partition key for user data is not aligned with access patterns or if auto-scaling is misconfigured, DynamoDB may throttle requests only at higher capacity tiers, allowing high-volume credential attempts to proceed without immediate rejection.

Additionally, if Strapi’s DynamoDB tables store sensitive fields (e.g., password hashes or email addresses) without encryption at rest and the IAM policies for the application identity are overly permissive, an attacker who can force high request volumes may infer the existence of valid users through timing differences or error responses. For example, a nonexistent partition key in DynamoDB can return a Query with zero items faster than a query that must scan many items, aiding attacker reconnaissance. Misconfigured fine-grained access control can also expose user attributes that should remain private, supporting further targeting in a credential stuffing campaign.

OpenAPI/Swagger spec analysis can highlight these risks when the spec documents authentication flows and DynamoDB-related models. Cross-referencing spec definitions with runtime findings may reveal missing protections such as missing rate-limiting parameters or weak password policies, which amplify the impact of credential stuffing against Strapi backed by DynamoDB.

Remediation focuses on reducing the attack surface for credential stuffing by tightening authentication controls, enforcing rate limiting, and securing DynamoDB access patterns and permissions.

• Enforce strong password policies and multi-factor authentication (MFA) in Strapi. Require minimum length, complexity, and use built-in validators to reduce the effectiveness of credential reuse.
• Implement robust rate limiting at the Strapi middleware layer to throttle authentication requests per IP or per user identifier. Combine with account lockout or progressive delays to slow automated attacks.
• Apply least-privilege IAM policies to the DynamoDB credentials used by Strapi. Avoid broad dynamodb:* permissions; scope actions to the specific table and required operations.
• Design DynamoDB table keys to distribute load evenly and avoid noisy-neighbor effects that can reveal timing differences. Use a composite partition key where appropriate and enable auto-scaling with conservative targets.
• Ensure encryption at rest and in transit is enabled. Use AWS KMS-managed keys for DynamoDB and enforce HTTPS for all communications from Strapi.

DynamoDB code examples for Strapi (using the AWS SDK v3) should perform parameterized queries and avoid scanning entire tables. Below are two realistic snippets: one for safe user lookup by username (partition key), and one for secure update of a user’s last login timestamp.

import { DynamoDBClient, GetCommand } from "@aws-sdk/client-dynamodb";
import { unmarshall } from "@aws-sdk/util-dynamodb";

const client = new DynamoDBClient({ region: "us-east-1" });

export async function getUserByUsername(username) {
  const command = new GetCommand({
    TableName: process.env.STRAPI_DYNAMODB_TABLE,
    Key: {
      username: { S: username } // enforce exact key lookup; no scan
    }
  });
  const response = await client.send(command);
  if (!response.Item) return null;
  return unmarshall(response.Item);
}

import { DynamoDBClient, UpdateCommand } from "@aws-sdk/client-dynamodb";

const client = new DynamoDBClient({ region: "us-east-1" });

export async function touchLastLogin(username) {
  const command = new UpdateCommand({
    TableName: process.env.STRAPI_DYNAMODB_TABLE,
    Key: {
      username: { S: username }
    },
    UpdateExpression: "set lastLogin = :now",
    ConditionExpression: "attribute_exists(username)",
    ExpressionAttributeValues: {
      ":now": { S: new Date().toISOString() }
    },
    ReturnValues: "UPDATED_NEW"
  });
  const response = await client.send(command);
  return response.Attributes;
}

In the Strapi admin, ensure that authentication routes reference these data-access patterns and do not fall back to broad scans or queries that could be abused. Combine these DynamoDB-safe practices with Strapi’s built-in protections and any API gateway or WAF rate limiting available in your hosting environment to create layered defenses against credential stuffing.