CVE-2008-3404 in MJGuest
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in guestbook.js.php in MJGuest 6.8 GT allows remote attackers to inject arbitrary web script or HTML via the link parameter.
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Analysis
by VulDB Data Team • 08/04/2025
The CVE-2008-3404 vulnerability represents a classic cross-site scripting flaw in the MJGuest 6.8 GT guestbook application where the guestbook.js.php script fails to properly sanitize user input. This vulnerability specifically affects the link parameter, which serves as an entry point for malicious code injection. The flaw exists in the application's failure to implement proper input validation and output encoding mechanisms, allowing attackers to execute arbitrary JavaScript code within the context of other users' browsers. The vulnerability is categorized under CWE-79 which defines improper neutralization of input during web page generation, commonly known as cross-site scripting.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing script code within the link parameter of the guestbook.js.php endpoint. When other users visit the affected page or interact with the guestbook functionality, their browsers execute the injected script, potentially leading to session hijacking, credential theft, or redirection to malicious sites. The vulnerability demonstrates a lack of proper input sanitization at the application layer where user-supplied data flows directly into the HTML output without adequate encoding or filtering. This type of flaw typically arises from insufficient security practices during the development phase, particularly in the handling of dynamic content generation.
The operational impact of CVE-2008-3404 extends beyond simple script execution as it can enable sophisticated attack vectors including credential harvesting, session manipulation, and data exfiltration. Attackers can leverage this vulnerability to establish persistent access to the application by injecting malicious scripts that capture user credentials or redirect them to phishing sites. The vulnerability affects the integrity of the guestbook application and can compromise user trust in the system. From an ATT&CK framework perspective, this vulnerability maps to T1566 (Phishing) and T1059 (Command and Scripting Interpreter) where attackers can use the XSS to deliver malware or establish command and control channels. The attack chain typically involves initial compromise through malicious link injection followed by user interaction that triggers the execution of the injected payload.
Mitigation strategies for CVE-2008-3404 should focus on implementing robust input validation and output encoding practices. The most effective approach involves sanitizing all user-supplied input through proper encoding before rendering it in the browser context, specifically employing HTML entity encoding for the link parameter. Additionally, implementing Content Security Policy (CSP) headers can significantly reduce the impact of successful XSS attempts by restricting script execution sources. The application should also employ proper input validation mechanisms that reject or sanitize potentially malicious content before processing. Security patches should be applied immediately to update the MJGuest application to versions that address this vulnerability, as the flaw represents a critical security risk that can be exploited without user interaction. Organizations should also consider implementing web application firewalls and regular security assessments to detect and prevent similar vulnerabilities in their web applications.