CVE-2012-5780 in merchant SDK
Summary
by MITRE
The Amazon merchant SDK 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 • 02/04/2018
The vulnerability described in CVE-2012-5780 represents a critical SSL/TLS certificate validation flaw within the Amazon merchant SDK implementation. This weakness stems from inadequate hostname verification during SSL certificate validation processes, creating a significant security gap that adversaries can exploit to conduct man-in-the-middle attacks. The vulnerability specifically affects how the SDK handles X.509 certificate validation by failing to properly verify that the server hostname matches either the Common Name field or the Subject Alternative Name fields within the certificate. This omission allows attackers to substitute a valid certificate from any trusted Certificate Authority without triggering security warnings, effectively bypassing the fundamental security mechanism designed to prevent such impersonation attacks.
The technical flaw manifests in the SDK's failure to perform proper certificate hostname validation as mandated by industry standards and best practices. According to the CWE (Common Weakness Enumeration) catalog, this vulnerability maps to CWE-295 which specifically addresses "Improper Certificate Validation" and falls under the broader category of weak cryptographic implementations. The issue directly violates the SSL/TLS protocol specifications that require strict hostname verification to prevent certificate spoofing attacks. When a client application connects to a server using SSL/TLS, it must validate that the certificate presented by the server matches the hostname being accessed. The Amazon merchant SDK's failure to implement this validation creates a scenario where an attacker with access to a valid certificate can establish a fraudulent connection that appears legitimate to the client application.
From an operational impact perspective, this vulnerability exposes Amazon merchant applications to severe security risks including data interception, credential theft, and unauthorized transaction processing. Attackers can exploit this weakness to eavesdrop on communications between merchant applications and Amazon's servers, potentially gaining access to sensitive business data, customer information, and financial transaction details. The vulnerability also enables attackers to manipulate responses from Amazon's services, potentially allowing them to process fraudulent transactions or redirect merchant activities to malicious endpoints. This type of attack falls under the MITRE ATT&CK framework's technique T1046 for "Network Service Scanning' and T1566 for 'Phishing' when combined with social engineering elements, though the core exploitation leverages the fundamental SSL certificate validation weakness.
The mitigation strategies for this vulnerability involve implementing proper SSL certificate hostname verification within the SDK's certificate validation logic. Organizations should ensure that all SSL/TLS implementations strictly validate that the server hostname matches either the Common Name field or Subject Alternative Name fields in the presented certificate. This requires updating the SDK to comply with RFC 2818 and RFC 6125 standards for hostname verification. Additionally, developers should implement certificate pinning mechanisms where appropriate, and regularly audit their SSL/TLS implementations against established security frameworks. The vulnerability also highlights the importance of following the principle of least privilege and implementing multiple layers of security controls to prevent exploitation of such fundamental weaknesses in cryptographic implementations. Security teams should monitor for any instances where the affected SDK is being used and ensure that all applications are updated to properly validate SSL certificates during connection establishment processes.