CVE-2009-4047 in PHD Help Desk
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in PHD Help Desk 1.43 allow remote attackers to inject arbitrary web script or HTML via (1) the PATH_INFO to area.php; the (2) pagina, (3) sentido, (4) q_registros, and (5) orden parameters to area.php; (6) the q_registros parameter to solic_display.php; (7) the PATH_INFO to area_list.php; (8) the q_registros parameter to area_list.php; (9) the PATH_INFO to atributo.php; the (10) pagina, (11) q_registros, and (12) orden parameters to atributo_list.php; (13) an arbitrary parameter name beginning with "sentido" to atributo_list.php; and (14) the PATH_INFO to caso_insert.php. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 07/29/2025
The vulnerability described in CVE-2009-4047 represents a critical cross-site scripting vulnerability affecting PHD Help Desk version 1.43, a web-based help desk application. This vulnerability classifies under CWE-79 as it involves the injection of malicious scripts into web applications, specifically through improper input validation and output encoding mechanisms. The flaw exists across multiple entry points within the application's PHP scripts, making it particularly dangerous as it provides multiple attack vectors for potential exploitation. The vulnerability allows remote attackers to execute arbitrary web scripts or HTML code in the context of the victim's browser, potentially leading to session hijacking, credential theft, or defacement of the help desk interface.
The technical implementation of this vulnerability stems from the application's failure to properly sanitize and validate user input parameters received through HTTP requests. Attackers can exploit this weakness by crafting malicious URLs that contain script payloads in various parameters including PATH_INFO, pagina, sentido, q_registros, orden, and other parameter names. The vulnerability affects several PHP files including area.php, solic_display.php, area_list.php, atributo.php, and atributo_list.php, indicating a systemic issue in how the application processes user-supplied data. The PATH_INFO parameter manipulation allows attackers to inject scripts directly into the URL structure, while the other parameters provide additional attack surfaces through form submissions or direct parameter injection.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable sophisticated attacks such as session fixation, credential harvesting, and data exfiltration. An attacker who successfully exploits any of these vectors could potentially establish persistent access to the help desk system, compromise user sessions, or redirect victims to malicious websites. The vulnerability's presence in multiple files suggests that the application's input validation is inconsistently applied throughout the codebase, creating a broad attack surface that could be leveraged for various malicious activities. This type of vulnerability is particularly concerning in help desk applications which often contain sensitive user information and business-critical data.
Mitigation strategies should focus on implementing comprehensive input validation and output encoding across all application components. The primary defense mechanism involves sanitizing all user-supplied input parameters before processing or displaying them in web responses, following established secure coding practices. The application should implement proper HTML escaping for all dynamic content and utilize parameterized queries where applicable. Organizations should also consider implementing Content Security Policy (CSP) headers to limit the execution of unauthorized scripts. Additionally, regular security code reviews and penetration testing should be conducted to identify similar vulnerabilities in other application components. This vulnerability demonstrates the importance of consistent security practices across all application layers and highlights the need for proper input validation as outlined in the OWASP Top Ten security principles and MITRE ATT&CK framework's technique T1059 for command and script injection. The lack of proper input sanitization in this case represents a fundamental security flaw that could be addressed through proper application hardening and adherence to secure development lifecycle practices.