CVE-2018-5316 in Server Gateway for WooCommerce Plugin
Summary
by MITRE
The "SagePay Server Gateway for WooCommerce" plugin before 1.0.9 for WordPress has XSS via the includes/pages/redirect.php page parameter.
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Analysis
by VulDB Data Team • 01/20/2023
The CVE-2018-5316 vulnerability affects the SagePay Server Gateway for WooCommerce plugin version 1.0.8 and earlier, representing a cross-site scripting flaw that compromises the security of WordPress e-commerce installations. This vulnerability specifically resides within the plugin's redirect.php file where the page parameter is not properly sanitized before being rendered in the web application's response. The affected plugin integrates SagePay payment processing capabilities into WooCommerce stores, making it a critical concern for online retailers who process payments through WordPress platforms.
The technical implementation of this vulnerability stems from insufficient input validation and output encoding practices within the plugin's codebase. When the page parameter is passed through the redirect.php endpoint without proper sanitization, malicious actors can inject arbitrary JavaScript code that executes in the context of other users' browsers. This occurs because the plugin fails to implement proper HTML escaping or context-appropriate encoding before incorporating user-supplied input into the HTTP response. The vulnerability aligns with CWE-79 which defines cross-site scripting as the improper inclusion of executable code in web pages viewed by other users, and represents a classic example of reflected XSS where malicious input is immediately reflected back to the user without proper sanitization.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, deface websites, steal sensitive customer information, or redirect users to malicious domains. In the context of e-commerce environments, this vulnerability poses significant risks to both merchant and customer data security, potentially allowing attackers to access payment information, customer details, or manipulate transaction flows. The attack vector requires minimal sophistication as it typically involves crafting a malicious URL with encoded JavaScript payloads that, when clicked by an authenticated user, executes the malicious code in their browser session.
Mitigation strategies for CVE-2018-5316 should prioritize immediate plugin updates to version 1.0.9 or later, which contain the necessary sanitization fixes. Security administrators should also implement web application firewalls with XSS detection capabilities and conduct regular security audits of WordPress plugins to identify similar vulnerabilities. The ATT&CK framework categorizes this vulnerability under T1213 - Data from Information Repositories, as attackers could potentially extract sensitive data through session manipulation, and T1566 - Phishing, as the vulnerability enables the creation of malicious redirects that could deceive users into revealing credentials or personal information. Additionally, implementing Content Security Policy headers can provide an additional layer of defense against reflected XSS attacks by restricting the sources from which scripts can be loaded, making exploitation more difficult even if the underlying vulnerability persists.