CVE-2021-41120 Unauthorized access to Credit card form in sylius/paypal-plugin
Attackers can access unauthenticated credit card forms via predictable URLs to view customer names, exposing personally identifiable information.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-41120?
CVE-2021-41120 is a high-severity missing authorization vulnerability in Sylius PayPalPlugin, published on 5 Oct 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
sylius/paypal-plugin is a paypal plugin for the Sylius development platform. In affected versions the URL to the payment page done after checkout was created with autoincremented payment id (/pay-with-paypal/{id}) and therefore it was easy to predict. The problem is that the Credit card form has prefilled "credit card holder" field with the Customer's first and last name and hence this can lead to personally identifiable information exposure. Additionally, the mentioned form did not require authentication. The problem has been patched in Sylius/PayPalPlugin 1.2.4 and 1.3.1. If users are unable to update they can override a sylius_paypal_plugin_pay_with_paypal_form route and change its URL parameters to (for example) {orderToken}/{paymentId}, then override the Sylius\PayPalPlugin\Controller\PayWithPayPalFormAction service, to operate on the payment taken from the repository by these 2 values. It would also require usage of custom repository method. Additionally, one could override the @SyliusPayPalPlugin/payWithPaypal.html.twig template, to add contingencies: ['SCA_ALWAYS'] line in hostedFields.submit(...) function call (line 421). It would then have to be handled in the function callback.
Which versions are affected by CVE-2021-41120?
4 open source packages ship an affected version, including sylius/paypal-plugin. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
sylius/paypal-plugin Packagist | From 1.0.0 | 1.2.4 |
sylius/paypal-plugin Packagist | From 1.0.0 | 1.2.4 |
sylius/paypal-plugin Packagist | From 1.3.0 | 1.3.1 |
sylius/paypal-plugin Packagist | From 1.3.0 | 1.3.1 |
Products include Sylius Paypal.
How do I fix CVE-2021-41120?
Upgrade sylius/paypal-plugin to a fixed version for your release line: 1.2.4 or 1.3.1.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2021-41120 being exploited?
There is no known exploitation of CVE-2021-41120 in the wild and no public exploit code.
Sources
Also known as GHSA-25fx-mxc2-76g7.