CVE-2006-4923 in eSyndiCat Portal System
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in search.php in eSyndiCat Portal System allows remote attackers to inject arbitrary web script or HTML via the what parameter.
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Analysis
by VulDB Data Team • 10/17/2025
The CVE-2006-4923 vulnerability represents a classic cross-site scripting flaw within the eSyndiCat Portal System's search functionality, specifically in the search.php script. This vulnerability manifests when the application fails to properly sanitize user input passed through the what parameter, creating an exploitable condition that enables remote attackers to inject malicious web scripts or HTML code into the application's response. The flaw exists at the input validation and output encoding level, where the system does not adequately filter or escape special characters that could be interpreted as executable code by web browsers. This type of vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent web application security issues identified by the CWE database. The vulnerability allows attackers to execute arbitrary scripts in the context of the victim's browser session, potentially leading to session hijacking, credential theft, or other malicious activities that exploit the trust relationship between the user and the vulnerable application.
The technical exploitation of this vulnerability requires an attacker to craft a malicious payload containing HTML or JavaScript code and submit it through the what parameter of the search.php endpoint. When the vulnerable system processes this input and displays it in the search results or related pages without proper sanitization, the injected code executes within the victim's browser context. This occurs because the application fails to implement proper output encoding or filtering mechanisms that would neutralize potentially dangerous characters such as angle brackets, quotes, or script tags. The attack vector is particularly concerning as it leverages the legitimate search functionality of the portal system, making it more difficult to detect and prevent. According to ATT&CK framework, this vulnerability maps to T1531 - Run-time Process Injection and T1059 - Command and Scripting Interpreter, as it enables attackers to execute malicious code through the web application interface. The vulnerability demonstrates a fundamental weakness in the application's security posture, specifically in its handling of user-supplied data and its lack of input validation controls.
The operational impact of CVE-2006-4923 extends beyond simple script injection, potentially allowing attackers to perform session hijacking, redirect users to malicious websites, or steal sensitive information from authenticated users. When exploited successfully, this vulnerability can compromise the integrity of the web application and potentially provide attackers with access to user sessions, leading to unauthorized access to sensitive data or administrative functions. The vulnerability affects the portal system's ability to maintain secure communication between users and the application, as it undermines the trust model that should exist between the web server and client browsers. Organizations using eSyndiCat Portal System would face significant security risks including potential data breaches, unauthorized access to user accounts, and damage to their reputation due to the exposure of their web application to persistent cross-site scripting attacks. The vulnerability's impact is amplified by the fact that it affects the core search functionality, which is likely used by many users and could be leveraged to spread malicious payloads to a wide range of victims.
Mitigation strategies for CVE-2006-4923 should focus on implementing robust input validation and output encoding mechanisms throughout the application. The primary defense involves sanitizing all user input through proper validation and encoding before processing or displaying it within the application's interface. This includes implementing proper HTML escaping for all dynamic content and using parameterized queries or input validation libraries to prevent malicious code injection. Organizations should also consider implementing Content Security Policy (CSP) headers to add an additional layer of protection against XSS attacks by restricting the sources from which scripts can be loaded. Additionally, regular security testing including automated vulnerability scanning and manual penetration testing should be conducted to identify similar issues within the application. The implementation of proper web application firewalls and input validation rules can also help prevent exploitation attempts. According to industry best practices and security standards, organizations should follow the OWASP Top Ten guidelines for preventing cross-site scripting vulnerabilities, which emphasize the importance of proper input validation, output encoding, and secure coding practices. Regular patch management and security updates are essential to address such vulnerabilities in legacy systems and prevent exploitation by threat actors who may have already developed or discovered working exploits for this specific flaw.