CVE-2018-16173 in LearnPress
Summary
by MITRE
Cross-site scripting vulnerability in LearnPress prior to version 3.1.0 allows remote attackers to inject arbitrary web script or HTML via unspecified vectors.
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Analysis
by VulDB Data Team • 04/27/2020
The CVE-2018-16173 vulnerability represents a critical cross-site scripting flaw discovered in the LearnPress learning management system plugin for WordPress. This vulnerability affected versions prior to 3.1.0 and enabled remote attackers to execute malicious scripts within the context of a victim's browser session. The flaw stemmed from insufficient input validation and output sanitization mechanisms within the plugin's codebase, creating an attack surface where user-supplied data could be improperly handled and rendered without adequate security measures. The vulnerability's impact extended beyond simple script execution as it could potentially allow attackers to steal user sessions, deface websites, or redirect users to malicious sites. Given that LearnPress was widely used for online course delivery and educational platforms, the exploitation of this vulnerability could have compromised thousands of educational institutions and their users' sensitive data.
The technical implementation of this XSS vulnerability occurred through unspecified vectors within the plugin's handling of user input parameters. Attackers could craft malicious payloads that would be stored or processed by the LearnPress system and subsequently executed when other users viewed affected pages. The vulnerability's classification aligns with CWE-79, which specifically addresses Cross-Site Scripting flaws in software applications. This weakness in the input sanitization process allowed attackers to inject malicious scripts that could leverage the privileges of authenticated users, potentially escalating to more severe security incidents. The vulnerability's nature as a stored or reflected XSS issue meant that attackers could persistently inject malicious code that would execute whenever legitimate users accessed the compromised functionality, creating a persistent threat vector that could affect multiple users over time.
The operational impact of CVE-2018-16173 extended significantly beyond individual security breaches, particularly given LearnPress's widespread adoption in educational environments and corporate training platforms. When exploited, this vulnerability could enable attackers to steal cookies, session tokens, and other sensitive information from authenticated users, potentially leading to complete account compromise and unauthorized access to course materials, student data, and administrative functions. The vulnerability's exploitation could also facilitate phishing attacks by redirecting users to malicious domains or displaying deceptive content that mimicked legitimate administrative interfaces. Organizations using LearnPress faced potential compliance violations under various data protection regulations, as user data could be accessed or manipulated without proper authorization. The attack surface was particularly concerning for educational institutions managing sensitive student information, as the compromise of these systems could result in data breaches affecting thousands of individuals.
Mitigation strategies for CVE-2018-16173 centered primarily on upgrading to LearnPress version 3.1.0 or later, which contained the necessary security patches addressing the input validation and output sanitization issues. System administrators should implement comprehensive patch management procedures to ensure all WordPress plugins and themes remain current with security updates. Additional defensive measures included implementing Content Security Policy headers to limit script execution, configuring proper input validation at multiple layers of the application, and conducting regular security audits of WordPress installations. The vulnerability's resolution aligned with ATT&CK technique T1059.007, which involves the use of scripting languages for execution, highlighting the importance of proper input sanitization to prevent malicious script injection. Organizations should also establish monitoring protocols to detect unusual activity patterns that might indicate exploitation attempts, while maintaining regular backups to facilitate recovery from potential compromise scenarios. The incident underscored the critical importance of maintaining up-to-date software versions and implementing robust security practices within educational technology ecosystems.