CVE-2018-11557 in Easy Class Education Platform
Summary
by MITRE
YIBAN Easy class education platform 2.0 has XSS via the articlelist.php k parameter.
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Analysis
by VulDB Data Team • 02/09/2020
The CVE-2018-11557 vulnerability affects the YIBAN Easy class education platform version 2.0, specifically targeting the articlelist.php script through the k parameter. This represents a classic cross-site scripting flaw that allows attackers to inject malicious scripts into web pages viewed by other users. The vulnerability stems from inadequate input validation and output encoding mechanisms within the platform's content management system, creating an exploitable entry point for malicious actors seeking to compromise user sessions or execute unauthorized actions.
The technical implementation of this XSS vulnerability occurs when the k parameter in articlelist.php fails to properly sanitize user-supplied input before rendering it in the web page context. This weakness enables attackers to submit malicious payloads through the parameter, which are then executed in the browsers of unsuspecting users who view the affected pages. The vulnerability falls under CWE-79 - Improper Neutralization of Input During Web Page Generation, which specifically addresses the failure to properly encode or escape user-controllable data before including it in web output.
From an operational perspective, this vulnerability poses significant risks to educational institutions using the platform, as it can lead to session hijacking, credential theft, and unauthorized access to sensitive educational content. Attackers could potentially escalate privileges, access confidential student information, or manipulate course materials. The impact extends beyond individual user compromise to potential institutional data breaches and reputational damage. According to ATT&CK framework, this vulnerability maps to T1531 - Account Access Removal and T1071.001 - Application Layer Protocol: Web Protocols, as it exploits web application weaknesses to gain unauthorized access to educational resources.
The exploitation of this vulnerability typically involves crafting malicious payloads that leverage the k parameter to inject JavaScript code into the application's response. Attackers may use techniques such as DOM-based XSS or reflected XSS to execute malicious scripts that can steal cookies, redirect users to malicious sites, or perform actions on behalf of authenticated users. The platform's lack of proper input validation and output encoding creates an environment where attacker-controlled data can be interpreted as executable code rather than benign text.
Mitigation strategies for this vulnerability include implementing comprehensive input validation that filters or escapes special characters in all user-supplied parameters, particularly those used in dynamic content generation. The platform should employ proper output encoding mechanisms that convert potentially dangerous characters into their safe HTML equivalents before rendering content. Additionally, implementing Content Security Policy (CSP) headers can provide an additional layer of protection against XSS attacks by restricting the sources from which scripts can be loaded. Regular security testing and code reviews should be conducted to identify and remediate similar vulnerabilities in the platform's codebase. Organizations should also consider implementing web application firewalls and monitoring systems to detect and prevent exploitation attempts. The vulnerability highlights the critical importance of secure coding practices and input validation in web applications, particularly in educational platforms that handle sensitive user data and require robust security controls to protect institutional assets and student privacy.