CVE-2008-6906 in BabbleBoard
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.php in BabbleBoard 1.1.6 allows remote attackers to inject arbitrary web script or HTML via the username.
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Analysis
by VulDB Data Team • 11/18/2024
The vulnerability identified as CVE-2008-6906 represents a critical cross-site scripting flaw within the BabbleBoard 1.1.6 web application, specifically targeting the index.php script. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application security weaknesses. The flaw occurs when the application fails to properly sanitize user input, particularly the username parameter, allowing malicious actors to inject malicious code that executes in the context of other users' browsers. The vulnerability affects the core authentication and display functionality of the bulletin board system where user-generated content is rendered without adequate security controls.
The technical exploitation of this vulnerability occurs through the manipulation of the username field in the index.php script, which serves as the primary interface for user interaction and content display. When a malicious user submits crafted script code within their username, the application stores this input without proper validation or encoding, subsequently rendering it in the web page output. This creates a persistent XSS vector where any user who views the affected page will have the malicious script executed in their browser context. The vulnerability is particularly dangerous because it leverages the application's legitimate user registration and display mechanisms to deliver malicious payloads, making detection more challenging for security monitoring systems.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with the ability to perform a wide range of malicious activities including session hijacking, credential theft, and redirection to phishing sites. Attackers can exploit this vulnerability to steal cookies, modify user permissions, or even gain administrative access to the forum if they can manipulate the username of an administrator. The vulnerability affects the fundamental security model of the application by allowing untrusted input to be executed as code, which violates the principle of least privilege and input validation. This type of vulnerability can lead to complete compromise of user accounts and potentially the entire application infrastructure, as demonstrated by the ATT&CK framework's categorization of XSS as a technique for privilege escalation and initial access.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and output encoding mechanisms throughout the application. The primary defense involves sanitizing all user input, particularly the username parameter, through proper HTML encoding before rendering any content. This approach aligns with the OWASP Top Ten security controls and follows the principle of defense in depth. Additionally, implementing Content Security Policy headers can provide an additional layer of protection against script execution, while regular security audits and penetration testing can help identify similar vulnerabilities in other application components. The fix should be implemented immediately through proper input sanitization, as the vulnerability represents a critical risk to user data and application integrity.