CVE-2018-19227 in LAOBANCMS
Summary
by MITRE
An issue was discovered in LAOBANCMS 2.0. It allows XSS via the admin/liuyan.php neirong[] parameter.
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Analysis
by VulDB Data Team • 04/11/2020
The vulnerability identified as CVE-2018-19227 represents a cross-site scripting flaw within LAOBANCMS version 2.0, specifically affecting the admin/liuyan.php component. This issue arises from insufficient input validation and output sanitization mechanisms that fail to properly handle user-supplied data within the neirong[] parameter. The vulnerability exists in the context of a content management system that processes user feedback or留言 (messages) through the administrative interface, making it particularly concerning for organizations relying on this platform for content management and user interaction.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing script code within the neirong[] parameter of the liuyan.php endpoint. When the application processes this input without adequate sanitization and subsequently displays it within the web page context, the embedded malicious scripts execute in the victim's browser. This vulnerability falls under CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental web application security weakness that allows attackers to inject malicious scripts into web pages viewed by other users. The flaw demonstrates poor input validation practices where user data is directly incorporated into HTML output without proper encoding or sanitization.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform various malicious activities including session hijacking, credential theft, data exfiltration, and redirection to malicious websites. An attacker could potentially steal administrator session cookies, allowing unauthorized access to the CMS administrative interface, or inject malicious content that could compromise the entire website. The vulnerability affects the integrity and availability of the web application, as it could be leveraged to deface the website, inject spam content, or create backdoors for persistent access. This type of vulnerability is particularly dangerous in content management systems where administrators have elevated privileges and can modify critical website components.
Organizations should implement immediate mitigations including input validation and output encoding to prevent the execution of malicious scripts. The recommended approach involves sanitizing all user inputs through proper encoding before rendering them in web pages, implementing Content Security Policy headers to limit script execution, and conducting thorough input validation to reject suspicious characters or patterns. Additionally, the application should be updated to a patched version of LAOBANCMS that addresses this vulnerability, as the developers likely released a fix that properly handles the neirong[] parameter. This vulnerability aligns with ATT&CK technique T1059.007 - Command and Scripting Interpreter: JavaScript, which describes how adversaries can use JavaScript to compromise systems through web-based attacks. Regular security testing including dynamic application security testing and manual penetration testing should be conducted to identify similar vulnerabilities in web applications and ensure proper implementation of secure coding practices.