CVE-2008-2131 in mvnForum
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in mvnForum 1.1 GA allows remote authenticated users to inject arbitrary web script or HTML via the topic field, which is later displayed by user/viewthread.jsp through use of the "quick reply button."
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Analysis
by VulDB Data Team • 09/24/2018
The vulnerability identified as CVE-2008-2131 represents a critical cross-site scripting flaw within mvnForum version 1.1 GA, a popular web-based forum application. This vulnerability specifically affects the user/viewthread.jsp component of the application, creating a dangerous condition where authenticated users can exploit the system to inject malicious scripts that persist and execute within the context of other users' browsers. The vulnerability arises from insufficient input validation and output encoding mechanisms within the forum's topic field processing functionality.
The technical exploitation of this vulnerability occurs through the manipulation of the topic field during thread creation or reply processes. When an authenticated user submits content containing malicious script tags through the topic field, the application fails to properly sanitize or encode this input before rendering it in the user/viewthread.jsp page. The "quick reply button" functionality serves as the vector through which this malicious content becomes persistent, as the system processes and displays the injected script without adequate protection measures. This flaw directly maps to CWE-79, which defines Cross-Site Scripting as a weakness where untrusted data is incorporated into web page content without proper validation or encoding, allowing attackers to execute scripts in the victim's browser context.
The operational impact of this vulnerability extends beyond simple data corruption or theft, as it provides attackers with the capability to perform session hijacking, deface the forum, or redirect users to malicious sites. An attacker with valid credentials can craft payloads that execute in the context of other forum users, potentially compromising their sessions and gaining unauthorized access to personal information. The vulnerability affects all users who view the malicious thread, making it particularly dangerous in community environments where users trust the content displayed by the forum. This vulnerability also aligns with ATT&CK technique T1531, which describes the use of malicious web content to compromise user sessions and establish persistent access to systems.
Mitigation strategies for CVE-2008-2131 require immediate implementation of proper input validation and output encoding measures throughout the mvnForum application. The primary defense involves implementing strict sanitization of all user input, particularly in fields that are rendered in web pages without proper HTML encoding. The application should employ context-aware output encoding mechanisms that ensure any user-supplied content is properly escaped before being displayed in the viewthread.jsp page. Additionally, developers should implement Content Security Policy headers to limit the execution of inline scripts and establish proper input validation routines that reject or sanitize potentially malicious content. Regular security audits and code reviews should be conducted to identify similar vulnerabilities in other input/output processing pathways, while the forum should be upgraded to a supported version that addresses this specific vulnerability. Organizations using mvnForum should also consider implementing web application firewalls and monitoring for suspicious input patterns that may indicate attempted exploitation of this or similar vulnerabilities.