Container Escape in Strapi with Dynamodb

A container escape in Strapi combined with an AWS DynamoDB backend occurs when an attacker who has compromised the Strapi process inside its container can leverage DynamoDB interactions to break out of the intended security boundaries. Strapi, as a Node.js application, may run with IAM credentials or environment variables that grant access to DynamoDB. If the application does not enforce strict resource-level permissions, an attacker can manipulate API endpoints (for example, a custom controller that queries DynamoDB using user-supplied parameters) to perform unintended operations on other DynamoDB tables or even attempt AWS metadata service access from within the container.

In this scenario, the attacker uses input validation flaws or insecure direct object references (IDOR) in Strapi routes to inject malicious payloads that alter DynamoDB requests. For instance, a vulnerable find or create action might concatenate user input into a DynamoDB query, allowing an attacker to specify a different table name or use conditional expressions that read from sensitive tables. Because the container shares the IAM role of the application, these manipulated DynamoDB requests can expose or modify data outside the application’s scope, effectively achieving a container escape by pivoting through data access.

The risk is compounded when Strapi uses unauthenticated or overly permissive endpoints that expose DynamoDB integration details, such as table names or key schemas, through error messages or introspection endpoints. An attacker can chain these information disclosures with IDOR to enumerate tables and craft precise requests that escape the application’s logical boundaries. This combination of a containerized Node.js environment and a misconfigured DynamoDB access pattern creates a pathway where a single compromised endpoint can lead to broader AWS resource exposure.

To remediate container escape risks in Strapi when using DynamoDB, enforce strict resource-level permissions and validate all inputs that influence DynamoDB requests. Use the AWS SDK for JavaScript to construct queries with explicit table names and parameter validation, avoiding any direct concatenation of user input into table or key expressions.

Below is a secure example of a Strapi custom controller that queries DynamoDB safely. It uses parameterized expressions and whitelists allowed table names to prevent table substitution attacks.

const { DynamoDB } = require('aws-sdk');
const ddb = new DynamoDB({ region: process.env.AWS_REGION });

const ALLOWED_TABLES = ['users', 'products', 'orders'];

module.exports = {
  async getEntity(ctx) {
    const { table, id } = ctx.query;
    if (!ALLOWED_TABLES.includes(table)) {
      return ctx.badRequest(null, [{ messages: [{ id: 'Not allowed', message: 'Table not allowed' }] }]);
    }
    if (!id || typeof id !== 'string') {
      return ctx.badRequest(null, [{ messages: [{ id: 'Invalid id', message: 'ID must be a string' }] }]);
    }
    const params = {
      TableName: table,
      Key: {
        id: { S: id },
      },
    };
    try {
      const data = await ddb.getItem(params).promise();
      if (!data.Item) {
        return ctx.notFound();
      }
      ctx.body = data.Item;
    } catch (err) {
      ctx.internalServerError(err.message);
    }
  },
};

Additionally, ensure the IAM role attached to the container follows the principle of least privilege. Define a policy that restricts actions to specific tables and required operations only. For example, allow dynamodb:GetItem and dynamodb:Query on designated table resources, and deny access to AWS metadata endpoints if not required.

For environments where Strapi runs in Kubernetes or similar orchestration, combine these code-level fixes with network policies that limit outbound connections to only DynamoDB endpoints. Regularly rotate credentials and monitor DynamoDB CloudTrail logs for anomalous queries that may indicate an attempted container escape.