CVE-2017-18499 in simple-membership Plugin
Summary
by MITRE
The simple-membership plugin before 3.5.7 for WordPress has XSS.
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Analysis
by VulDB Data Team • 11/23/2023
The CVE-2017-18499 vulnerability represents a cross-site scripting flaw discovered in the simple-membership plugin for WordPress systems prior to version 3.5.7. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is a critical security weakness that allows attackers to inject malicious client-side scripts into web applications. The simple-membership plugin serves as a membership management solution for WordPress sites, enabling user registration, authentication, and access control functionalities. The vulnerability specifically affects the plugin's handling of user input within its administrative interfaces and frontend components, creating an avenue for malicious actors to execute arbitrary scripts in the context of affected users' browsers.
The technical implementation of this XSS vulnerability stems from insufficient input validation and output sanitization within the plugin's codebase. Attackers can exploit this weakness by crafting malicious payloads that are then executed when legitimate users view affected pages or interact with the plugin's functionality. The vulnerability likely occurs in parameters or fields where user-provided data is directly rendered back to the browser without proper encoding or sanitization measures. This allows threat actors to inject JavaScript code that can steal session cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users. The impact is particularly concerning in WordPress environments where administrators or users may be logged in with elevated privileges, as the executed scripts could potentially escalate the attack to compromise the entire website or access sensitive administrative functions.
The operational impact of CVE-2017-18499 extends beyond simple script execution, as it can enable a wide range of malicious activities within the compromised WordPress environment. An attacker could leverage this vulnerability to hijack user sessions, modify membership data, or even gain unauthorized access to the WordPress administration panel. The vulnerability's presence in a membership plugin creates additional risks since it could potentially expose user credentials, personal information, or membership status details. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1566 (Phishing) and T1059 (Command and Scripting Interpreter) where attackers can use the XSS flaw to establish persistent access or conduct further reconnaissance. The exploitation of this vulnerability typically requires minimal technical skill, making it attractive to threat actors across different skill levels and potentially leading to widespread compromise of WordPress sites using affected plugin versions.
Mitigation strategies for CVE-2017-18499 primarily focus on immediate remediation through plugin updates to version 3.5.7 or later, which contains the necessary security patches to address the XSS vulnerability. System administrators should implement comprehensive monitoring of their WordPress installations to identify any unauthorized updates or modifications that might indicate exploitation attempts. Additional defensive measures include implementing Content Security Policy headers to limit script execution, enabling proper input validation at all application layers, and conducting regular security audits of third-party plugins. Organizations should also establish robust patch management procedures to ensure timely updates of all WordPress components, including plugins, themes, and core software. The vulnerability demonstrates the importance of maintaining up-to-date security practices and the critical role that third-party software plays in overall web application security posture. Regular security assessments and vulnerability scanning should be integrated into operational procedures to proactively identify and remediate similar weaknesses in other components of the WordPress ecosystem.