CVE-2003-1370 in Nuked-klan
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in Nuked-Klan 1.2b allow remote attackers to inject arbitrary HTML or web script via (1) the Author field in the Guestbook module, (2) the Titre or Pseudo fields in the Forum module, or (3) "La Tribune Libre" in the Shoutbox module.
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Analysis
by VulDB Data Team • 07/14/2025
The vulnerability described in CVE-2003-1370 represents a critical cross-site scripting flaw affecting the Nuked-Klan 1.2b content management system. This issue stems from inadequate input validation and output sanitization mechanisms within three distinct modules of the application. The vulnerability exists in the Guestbook, Forum, and Shoutbox modules where user-supplied data is directly incorporated into web responses without proper sanitization, creating exploitable entry points for malicious actors.
The technical implementation of this vulnerability manifests through three specific attack vectors that all share the common weakness of insufficient data sanitization. In the Guestbook module, the Author field accepts unfiltered user input that gets rendered directly in the web page context, allowing attackers to inject malicious javascript code or html markup. Similarly, the Forum module contains two vulnerable fields - Titre and Pseudo - where user-submitted data bypasses proper validation before being displayed to other users. The third vector exists in the Shoutbox module through the "La Tribune Libre" field, which suffers from identical sanitization deficiencies. These flaws align with CWE-79, which specifically addresses Cross-Site Scripting vulnerabilities, and represent a classic example of improper input validation where user data flows directly into executable contexts without appropriate filtering or encoding.
The operational impact of this vulnerability is significant as it enables remote attackers to execute arbitrary scripts in the context of other users' browsers. Successful exploitation could allow attackers to steal session cookies, perform unauthorized actions on behalf of users, redirect victims to malicious websites, or extract sensitive information from the application. The vulnerability affects all users interacting with the affected modules, making it particularly dangerous as it can be exploited by anyone who can submit data through these forms. From an attacker's perspective, this vulnerability provides a persistent means of compromising user sessions and could be leveraged for more sophisticated attacks including credential theft or privilege escalation within the application environment.
Security professionals should consider this vulnerability in relation to the broader ATT&CK framework, specifically the web application attack patterns that involve client-side code injection. The vulnerability demonstrates how insufficient input validation in web applications creates opportunities for attackers to establish persistent footholds through user interaction with compromised content. Mitigation strategies should include implementing comprehensive input validation and output encoding mechanisms across all user-facing fields, particularly those that directly influence web page rendering. Organizations should also consider implementing Content Security Policy headers to limit script execution contexts and employ regular security scanning to identify similar vulnerabilities in legacy applications. The remediation process requires thorough code review of all input handling mechanisms and the implementation of proper HTML entity encoding for all user-supplied data before rendering in web contexts.