1. Introduction
The XOOPS <= 1.0 Dictionary Module Multiple Scripts XSS vulnerability affects PHP scripts within the XOOPS content management system. This flaw allows attackers to inject malicious JavaScript code into web pages viewed by other users, potentially compromising their accounts or systems. Websites running vulnerable versions of XOOPS are at risk. A successful exploit could lead to data theft, website defacement, and a loss of user trust.
2. Technical Explanation
The vulnerability stems from insufficient input validation in the ‘search.php’ and ‘letter.php’ scripts of the XOOPS Dictionary Module. An attacker can manipulate the ‘terme’ and ‘letter’ parameters to inject arbitrary JavaScript code that is then executed within a user’s browser when they visit the affected pages. This exploits the trust relationship between the client (user’s browser) and the server. The vulnerability is tracked as CVE-2004-1640.
- Root cause: Missing input validation on the ‘terme’ and ‘letter’ parameters in ‘search.php’ and ‘letter.php’.
- Exploit mechanism: An attacker crafts a malicious URL containing JavaScript code within the ‘terme’ or ‘letter’ parameter, then tricks a user into visiting that URL. For example:
http://example.com/modules/dictionary/search.php?terme= - Scope: XOOPS versions up to and including 1.0 are affected.
3. Detection and Assessment
Confirming vulnerability requires checking the installed version of XOOPS and examining the ‘search.php’ and ‘letter.php’ scripts for input validation routines.
- Quick checks: Check the XOOPS version via the admin interface or by viewing the source code of a public page.
- Scanning: Nessus plugin ID 1640 may detect this vulnerability, but results should be verified manually.
- Logs and evidence: Examine web server logs for requests containing suspicious JavaScript code in the ‘terme’ or ‘letter’ parameters. Look for patterns like `