The SureForms plugin for WordPress is widely utilized by website administrators for facilitating and managing various types of forms, including payment forms. It enables users to process payments via platforms like Stripe, making it a versatile tool for e-commerce and information collection. Businesses employing WordPress use SureForms to streamline form workflows, automate user interactions, and enhance the user experience on their sites. Its integration with WordPress ensures seamless configuration and customization in various web environments. However, this convenience also demands rigorous security measures to prevent exploits. Thus, frequent updates and security checks are vital to maintain its integrity.
The vulnerability associated with SureForms is an Information Disclosure flaw, allowing unauthorized users to skirt around the intended payment validation processes. This type of vulnerability exposes sensitive flow pathways within the plugin that attackers could exploit for profit. The oversight in payment validation can potentially result in unauthorized or fraudulent transactions without appropriate checks. Addressing such vulnerabilities is crucial for maintaining the integrity and security of payment processes managed through SureForms. Continuous oversight and patches are essential to safeguard users against these risks.
The vulnerability facilitates a bypass of the payment validation process, leveraging improper validation of form parameters. Attackers manipulate the 'form_id' parameter to skip server-side amount validation. The issue lies in the create_payment_intent AJAX handler which conditionally calls validate_payment_amount(). By sending form_id=0a default behavior when values are absentattackers can effectively bypass this validation. Consequently, this allows them to set arbitrary amounts for payment intents. As a result, the vulnerability poses a serious risk to financial operations processed through the plugin, necessitating urgent attention from system administrators.
If exploited, this vulnerability can lead to significant financial discrepancies as attackers could obtain goods or services at prices lower than intended. Furthermore, businesses might face incalculable losses from underpriced transactions going unnoticed. Such exploits undermine trust in the payment processing capabilities of affected WordPress sites. Users may encounter unexpected charges or altered invoicing, complicating financial reconciliation processes. Moreover, potential exposure of sensitive transaction details risks violating data protection standards and harming the site's reputation.
REFERENCES
- Update the SureForms WordPress plugin to version 2.6.0 or later, where the payment amount validation bypass has been addressed.
- Ensure that payment amounts are always validated on the server side before creating Stripe payment or subscription intents, regardless of the supplied
form_idorblock_idvalues. - Reject invalid, missing, or zero-value
form_idparameters instead of allowing them to bypass thevalidate_payment_amount()validation process. - Verify that the submitted payment amount matches the price configured for the corresponding form and payment block before processing the transaction.
- Restrict access to payment-related AJAX actions where possible and ensure that nonce validation is combined with proper authorization and server-side business logic validation.
- Review Stripe payment and subscription records for unusually low, modified, or unexpected transaction amounts that may indicate previous exploitation attempts.
- Implement additional server-side integrity checks for payment parameters such as amount, currency, form identifiers, and payment block identifiers before communicating with the payment provider.
- Remove or disable outdated SureForms installations that cannot be upgraded and avoid exposing vulnerable versions to unauthenticated users.
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