CVE-2012-5797 in PayPal Pro PayFlow module
Summary
by MITRE
The PayPal Pro PayFlow module in osCommerce does not verify that the server hostname matches a domain name in the subject s Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via an arbitrary valid certificate.
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Analysis
by VulDB Data Team • 02/09/2018
The vulnerability described in CVE-2012-5797 represents a critical SSL certificate validation flaw within the PayPal Pro PayFlow module of osCommerce e-commerce platforms. This issue stems from inadequate SSL/TLS certificate verification mechanisms that fail to properly validate the hostname against the certificate's subject common name or subject alternative name fields. The flaw exists in the cryptographic validation process where the system accepts any valid SSL certificate without ensuring proper hostname alignment, creating a significant security gap in secure communications. This vulnerability specifically affects web applications that utilize SSL/TLS encryption for sensitive data transmission, particularly payment processing systems where financial transactions occur.
The technical implementation of this vulnerability allows attackers to perform man-in-the-middle attacks by presenting a valid SSL certificate that has been issued for a different domain than the intended target server. When the osCommerce PayPal Pro PayFlow module processes SSL connections, it does not enforce proper hostname verification, meaning that even if an attacker obtains a legitimate certificate from a certificate authority, they can still use it to intercept and manipulate communications between clients and the payment processing server. This type of validation failure is classified as a weakness in certificate validation procedures and aligns with CWE-295, which specifically addresses improper certificate validation. The flaw essentially disables the hostname verification component of SSL/TLS protocols, rendering the encryption layer vulnerable to impersonation attacks.
The operational impact of this vulnerability is severe for e-commerce businesses utilizing osCommerce platforms with the affected PayPal Pro PayFlow module. Attackers can intercept sensitive payment information including credit card details, customer personal data, and transaction records during transmission between the customer's browser and the payment processing server. This compromise directly violates industry security standards and regulatory requirements such as those outlined in pci dss, which mandates proper encryption and authentication mechanisms for payment card data. The vulnerability also enables attackers to modify transaction data in transit, potentially leading to financial fraud, data manipulation, and complete loss of customer trust in the affected platform. Organizations may face significant financial losses, legal consequences, and reputational damage due to the exposure of sensitive transactional data.
Mitigation strategies for this vulnerability require immediate implementation of proper SSL certificate validation mechanisms within the osCommerce platform. System administrators should ensure that all SSL/TLS connections enforce strict hostname verification against certificate subject fields, implementing proper certificate validation routines that check both the common name and subject alternative name extensions. The fix should involve updating the PayPal Pro PayFlow module to include comprehensive hostname verification checks before establishing secure connections. Organizations should also consider implementing additional security measures such as certificate pinning, regular certificate audits, and monitoring for unauthorized certificate changes. This vulnerability highlights the importance of following established security frameworks and standards including those referenced in the mitre att&ck framework under the credential access and defense evasion tactics, where improper certificate validation can be exploited to gain unauthorized access to sensitive information. Regular security assessments and code reviews should be conducted to prevent similar issues in other components of the payment processing infrastructure.