đź“… Webinar - Delivering Security on Your Terms: An Intro to Self-Hosted

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đź“… Webinar - Delivering Security on Your Terms: An Intro to Self-Hosted

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My Stripe API key leaked! What should I do?

What is a Stripe API key and how it is used?

A Stripe API key is a unique code generated by the Stripe payment platform that allows developers to securely authenticate and interact with Stripe's API to process payments, manage subscriptions, and perform other actions on behalf of their users.

Here are the main use cases for the Stripe API key:

  • Authentication: The Stripe API key is used to authenticate and verify the identity of the user accessing the Stripe API. This ensures that only authorized users can interact with the payment system.
  • Authorization: The Stripe API key is used to authorize specific actions and operations within the Stripe platform. It controls what actions a user can perform and what data they can access.
  • Secure Communication: The Stripe API key is used to establish secure communication between the user's application and the Stripe servers. It encrypts the data being transmitted, ensuring that sensitive information is protected during transactions.

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1. Code snippets to prevent Stripe API key hardcoding using environment variables

Using environment variables for storing sensitive information like Stripe API keys is a secure practice for several reasons:

  • Environment variables are stored outside of the codebase, reducing the risk of exposing sensitive information through version control systems.
  • They can be easily managed and updated without the need to modify the code, making it convenient to rotate keys regularly for security purposes.
  • Environment variables are typically stored in a secure location on the server, protecting them from unauthorized access.
  • By using environment variables, you can separate configuration from code, improving maintainability and reducing the likelihood of accidental exposure of sensitive information.

How to secure your secrets using environment variables

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2. Code snippet to prevent Stripe API key hardcoding using AWS Secrets Manager

Using AWS Secrets Manager to manage Stripe API keys is a secure way to handle sensitive data. Here are code snippets in five different programming languages that demonstrate how to retrieve the Stripe API key from AWS Secrets Manager.

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3. Code snippet to prevent Stripe API key hardcoding using HashiCorp Vault

Using HashiCorp Vault for managing Stripe API keys is a great way to enhance security. Here are code snippets in five different programming languages for securely handling a Stripe API key using HashiCorp Vault.

Remember to replace the VAULT_ADDR and VAULT_TOKEN with your Vault server address and authentication token. The snippets assume that the Stripe API key is stored under the api_key field within Vault. The specifics of the Vault path and field names should be adjusted to match your Vault setup.

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4. Code snippet to prevent Stripe API key hardcoding using CyberArk Conjur

Using CyberArk Conjur to manage Stripe API key is a secure way to handle sensitive data. Here are code snippets in five different programming languages that demonstrate how to retrieve the Stripe API key from CyberArk Conjur.

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How to generate a Stripe API key?

To generate a Stripe API key, follow these steps:

  • Log in to your Stripe account.
  • Go to the Developers section in the dashboard.
  • Click on API keys.
  • Click on the "Create secret key" button to generate a new API key.
  • Copy the generated API key and securely store it for use in your application.

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My Stripe API key leaked, what are the possible reasons?

There are several reasons why a Stripe API key might have been leaked:

  • Improper storage: If the API key is stored in a public repository or in a file that is accessible to unauthorized users, it can easily be leaked.
  • Accidental exposure: Developers may accidentally include the API key in their code or configuration files that are shared publicly.
  • Weak access controls: If the system where the API key is stored does not have proper access controls in place, unauthorized users may be able to access and leak the key.
  • Phishing attacks: Hackers may use phishing techniques to trick developers into revealing their API keys.
  • Insufficient monitoring: Without proper monitoring and detection mechanisms in place, it may be difficult to identify when an API key has been leaked.

What are the risks of leaking a Stripe API key

When it comes to the risks of leaking a Stripe API key, developers need to understand the potential consequences of such an action. Here are some specific risks associated with exposing a Stripe API key:

  • Unauthorized Access: If a Stripe API key is leaked, attackers could gain unauthorized access to sensitive payment information and potentially make fraudulent transactions.
  • Data Breach: Exposing a Stripe API key could lead to a data breach, compromising the confidentiality of customer data and damaging the reputation of the company.
  • Financial Loss: Unauthorized access to a Stripe account through a leaked API key could result in financial losses for the business, as fraudulent transactions may be carried out.
  • Legal Consequences: Depending on the jurisdiction, there may be legal repercussions for failing to protect sensitive payment information, especially in cases where customer data is compromised due to a leaked API key.

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Stripe API key security best practices

  • Avoid embedding the secret directly in your code. Instead, use environment variables or secrets managers‍
  • Secure storage: store the Stripe API key in a secure location, such as a password manager or a secrets management service.
  • Regular rotation: periodically rotate the API key to minimize the risk of long-term exposure.
  • Restrict permissions: apply the principle of least privilege by only granting the key the minimum necessary permissions.
  • Monitor usage: regularly check the usage logs for any unusual activity or unauthorized access attempts.
  • Implement access controls: limit the number of users who have access to the secret and enforce strong authentication measures.
  • Use a secrets manager: utilize secret management tools like CyberArk or AWS Secrets Manager for enhanced security.

By adhering to the best practices, you can significantly reduce the risk associated with Stripe API key usage and improve the overall security of your Stripe API key implementations.

Exposing secrets on GitHub: What to do after leaking Credential and API keys

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Stripe API key leak remediation: what to do

What to do if you expose a secret: How to stay calm and respond to an incident [cheat sheet included]

How to check if Stripe API key was used by malicious actors

  • Review Access Logs: Check the access logs of your Stripe API key account for any unauthorized access or unusual activity. Pay particular attention to access from unfamiliar IP addresses (if you haven’t set up a specific allow list) or at odd hours.
  • Monitor Usage Patterns: Look for anomalies in the usage patterns, such as unexpected spikes in data access or transfer.
  • Check Active Connections and Operations: Review the list of active connections and recent operations on your database. Unusual or unauthorized operations might indicate malicious use.
  • Audit API Usage: If possible, audit the usage of your API key through any logging or monitoring services you have integrated with Stripe API key. This can give insights into any unauthorized use of your key.

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Steps to revoke the Stripe API key

Generate a new Stripe API key:

  • Log into your Stripe API key account.
  • Navigate to the API section and generate a new API key.

Update Services with the new key:

  • Replace the compromised key with the new key in all your services that use this API key.
  • Ensure all your applications and services are updated with the new key before deactivating the old one.

Deactivate the old Stripe API key:

  • Once the new key is in place and everything is functioning correctly, deactivate the old API key.
  • This can typically be done from the same section where you generated the new key.

Monitor after key rotation:

  • After deactivating the old key, monitor your systems closely to ensure that all services are running smoothly and that there are no unauthorized access attempts.

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How to understand which services will stop working

  • Inventory of services: keep an inventory of all services and applications that utilize your Stripe API key.
  • Communication and documentation: Ensure that your team is aware of which services are dependent on the key. Maintain documentation for quick reference.
  • Testing: before deactivating the old key, test your services with the new key in a staging environment. This helps in identifying any services that might face issues post rotation.
  • Fallback strategies: Have a fallback or emergency plan in case a critical service fails after the key rotation. This might include temporary measures or quick rollback procedures.

In summary, the remediation process involves identifying potential misuse, carefully rotating the key, and ensuring minimal disruption to services. Being proactive and having a well-documented process can greatly reduce the risks associated with a compromised API key.

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What about other secrets?

GitGuardian helps developers keep 350+ types of secrets out of source code. GitGuardian’s automated secrets detection and remediation solution secure every step of the development lifecycle, from code to cloud:

  • On developer workstations with git hooks (pre-commit and pre-push);
  • On code sharing platforms like GitHub, GitLab, and Bitbucket;
  • In CI environments (Circle CI, Travis CI, Jenkins CI, GitHub Actions, and many more);
  • In Docker images.

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Environment Variables
Environment Variables
Environment Variables

charge

nullable string

For card errors, the ID of the failed charge.

payment_method_type

nullable string

If the error is specific to the type of payment method, the payment method type that had a problem. This field is only populated for invoice-related errors.

doc_url

nullable string

A URL to more information about the error code reported.

request_log_url

nullable string

A URL to the request log entry in your dashboard.

charge

nullable string

If the error is specific to the type of payment method, the payment method type that had a problem. This field is only populated for invoice-related errors.

Hide
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child attributes

type

enum

For some errors that could be handled programmatically, a short string indicating the error code reported.

charge

nullable string

If the error is specific to the type of payment method, the payment method type that had a problem. This field is only populated for invoice-related errors.

Hide
Show
child attributes

type

enum

For some errors that could be handled programmatically, a short string indicating the error code reported.

payment_intent

nullable object

The PaymentIntent object for errors returned on a request involving a PaymentIntent.

setup_intent

nullable object

The SetupIntent object for errors returned on a request involving a SetupIntent.

Hide
Show
child attributes

type

enum

For some errors that could be handled programmatically, a short string indicating the error code reported.

Hide
Show
child attributes

type

enum

For some errors that could be handled programmatically, a short string indicating the error code reported.

CLIENT LIBRARIES

$ gem install stripe
$ pip install stripe
$ composer require stripe/stripe-php
MAVEN
<dependency>
  <groupId>com.stripe</groupId>
  <artifactId>stripe-java</artifactId>
  <version>24.16.0</version>
</dependency>

GRADLE
compile "com.stripe:stripe-java:24.16.0"
$ npm install --save stripe
$ go get github.com/stripe/stripe-go/v76
$ nuget install Stripe.net
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