CVE-2020-20129 in LaraCMS
Summary
by MITRE • 09/30/2021
LaraCMS v1.0.1 contains a stored cross-site scripting (XSS) vulnerability which allows attackers to execute arbitrary web scripts or HTML via a crafted payload in the content editor.
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Analysis
by VulDB Data Team • 10/04/2021
The vulnerability identified as CVE-2020-20129 represents a critical stored cross-site scripting flaw within LaraCMS version 1.0.1, a content management system built on the Laravel framework. This vulnerability resides in the content editor component where user inputs are not properly sanitized or validated before being stored in the database and subsequently rendered in web pages. The flaw enables attackers to inject malicious scripts that persist in the system and execute whenever affected pages are accessed by other users, making it particularly dangerous for content management platforms where multiple users interact with shared content.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding mechanisms within the CMS's content handling pipeline. When administrators or users create or edit content through the editor interface, the system fails to properly escape or filter special characters that could be interpreted as HTML or JavaScript code. This weakness allows attackers to craft malicious payloads containing script tags or other XSS vectors that are stored in the database without proper sanitization. The vulnerability is classified as a stored XSS attack under CWE-79 which specifically addresses improper neutralization of input during web page generation in web applications, making it a direct violation of secure coding practices for web application development.
The operational impact of this vulnerability extends beyond simple script execution, potentially enabling attackers to perform session hijacking, deface web pages, steal sensitive user data, or redirect victims to malicious websites. Since the vulnerability affects the content editor functionality, it can be exploited by any user with access to create or modify content, potentially including low-privilege accounts. This makes it particularly concerning for multi-user environments where content editors, contributors, or administrators might be targeted through social engineering or compromised credentials. The persistence of the malicious code means that even after the initial injection, the payload continues to execute for every user who accesses the affected content, creating a continuous threat vector that can be leveraged for extended attack campaigns.
Security professionals should implement multiple layers of mitigation strategies to address this vulnerability effectively. The primary remediation involves implementing proper input validation and output encoding mechanisms throughout the content management pipeline, ensuring that all user inputs are sanitized before storage and properly escaped before rendering. This includes implementing Content Security Policy headers, utilizing framework-specific XSS protection mechanisms, and conducting regular security code reviews. Organizations should also consider implementing web application firewalls to detect and block suspicious payloads, while maintaining comprehensive logging and monitoring capabilities to identify potential exploitation attempts. The vulnerability aligns with several ATT&CK techniques including T1059.007 for command and script injection, and T1566 for social engineering, making it a significant concern for organizations implementing comprehensive threat detection and response strategies. Regular security updates and patch management processes become critical to prevent exploitation of this type of vulnerability in production environments.