CVE-2018-0657 in Payment Module
Summary
by MITRE
Cross-site scripting vulnerability in EC-CUBE Payment Module and GMO-PG Payment Module (PG Multi-Payment Service) for EC-CUBE (EC-CUBE Payment Module (2.12) version 3.5.23 and earlier, EC-CUBE Payment Module (2.11) version 2.3.17 and earlier, GMO-PG Payment Module (PG Multi-Payment Service) (2.12) version 3.5.23 and earlier, and GMO-PG Payment Module (PG Multi-Payment Service) (2.11) version 2.3.17 and earlier) allow an attacker with administrator rights to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 03/21/2020
The CVE-2018-0657 vulnerability represents a critical cross-site scripting flaw within the EC-CUBE e-commerce platform's payment modules, specifically affecting both the standard EC-CUBE Payment Module and the GMO-PG Payment Module implementations. This vulnerability exists in versions up to and including 3.5.23 for the 2.12 branch and 2.3.17 for the 2.11 branch, creating a significant security risk for online retailers utilizing these payment processing systems. The flaw manifests when administrators interact with payment module configurations, providing attackers with an opportunity to execute malicious scripts within the context of the victim's browser session.
The technical nature of this vulnerability stems from inadequate input validation and output encoding within the payment module interfaces. When administrators access payment configuration pages or process payment-related data, the application fails to properly sanitize user-supplied input before rendering it in web pages. This insufficient sanitization creates an XSS vector where malicious scripts can be injected through unspecified input fields or parameters within the payment module configuration interfaces. The vulnerability's classification aligns with CWE-79 - Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly encode or escape user-controllable data in web applications.
The operational impact of this vulnerability is particularly severe given that it requires only administrator privileges to exploit, significantly reducing the attack surface compared to vulnerabilities requiring user interaction. An attacker with administrative access to the EC-CUBE system can inject malicious scripts that execute in the context of other administrators or end users who view affected pages. This creates potential for session hijacking, credential theft, and further privilege escalation within the payment processing environment. The attack could result in unauthorized financial transactions, data exfiltration, and complete compromise of payment processing functionalities. The vulnerability's presence in both EC-CUBE Payment Module and GMO-PG Payment Module implementations increases the potential attack surface across multiple payment processing configurations.
From an ATT&CK framework perspective, this vulnerability maps to T1059.007 - Command and Scripting Interpreter: PowerShell, as the injected scripts can execute arbitrary commands within the browser context, and T1566.001 - Credential Access: Phishing, as the malicious scripts could be designed to capture user credentials. The attack chain typically begins with an attacker obtaining administrator credentials through various means, followed by exploitation of this XSS vulnerability to inject persistent scripts that can capture session tokens or redirect users to malicious sites. Security controls such as Content Security Policy (CSP) headers and proper input validation mechanisms would have prevented or mitigated this vulnerability. Organizations should implement comprehensive input sanitization, output encoding, and regular security assessments of payment modules to prevent such vulnerabilities from being exploited in production environments.
The remediation approach for this vulnerability involves immediate patching of affected EC-CUBE versions to the latest secure releases, implementing proper input validation and output encoding mechanisms, and establishing comprehensive security monitoring for suspicious administrative activities. Organizations should also conduct thorough code reviews of payment module implementations and consider implementing Web Application Firewalls to detect and block potential XSS attempts. Regular security training for administrators and systematic vulnerability assessments of third-party payment modules are essential practices to prevent similar vulnerabilities from occurring in the future.