CVE-2012-5798 in Payflow Pro Express Checkout
Summary
by MITRE
The PayPal Pro PayFlow EC 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 • 02/11/2018
The vulnerability described in CVE-2012-5798 represents a critical SSL certificate validation flaw within the PayPal Pro PayFlow EC module of osCommerce e-commerce platforms. This issue stems from improper SSL certificate verification mechanisms that fail to properly validate the hostname against the certificate's subject common name or subject alternative name fields. The absence of this crucial validation step creates a significant security gap that adversaries can exploit to conduct man-in-the-middle attacks against unsuspecting users.
The technical flaw manifests in the module's failure to implement proper SSL certificate hostname verification as specified in industry standards. When establishing SSL connections for payment processing, the system should verify that the certificate presented by the server matches the domain name being accessed. This validation is essential for preventing attackers from using valid certificates issued for different domains to impersonate legitimate payment servers. The vulnerability specifically affects the osCommerce platform's PayPal Pro PayFlow EC integration, which handles credit card transactions and payment processing communications.
The operational impact of this vulnerability is severe as it directly compromises the security of financial transactions conducted through affected osCommerce installations. Attackers can exploit this weakness by intercepting payment communications and presenting valid SSL certificates for domains they control, thereby enabling them to capture sensitive payment information including credit card details and personal financial data. This creates a significant risk of financial fraud and data breaches for both merchants and customers using the vulnerable platform. The vulnerability affects the entire payment processing chain, making it particularly dangerous for e-commerce businesses handling sensitive financial transactions.
Organizations affected by this vulnerability should immediately implement mitigations including updating to patched versions of osCommerce that address the SSL certificate validation issue, implementing additional network security controls such as certificate pinning, and conducting thorough security assessments of their payment processing infrastructure. The vulnerability aligns with CWE-295, which specifically addresses improper certificate validation, and represents a clear violation of the principle of secure communication established in the OWASP Top Ten security risks. Security professionals should also consider implementing network monitoring solutions to detect potential man-in-the-middle attack attempts and establish proper certificate management practices to ensure all SSL connections maintain proper hostname verification. This vulnerability demonstrates the critical importance of proper SSL certificate validation in protecting sensitive financial data and maintaining user trust in e-commerce platforms.