CVE-2009-2302 in Aardvark Topsites PHP
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.php in Aardvark Topsites PHP 5.2.0 and earlier allows remote attackers to inject arbitrary web script or HTML via the q parameter in a search action. NOTE: it was later reported that 5.2.1 is also affected.
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Analysis
by VulDB Data Team • 02/02/2025
The CVE-2009-2302 vulnerability represents a classic cross-site scripting flaw in the Aardvark Topsites PHP web application version 5.2.0 and earlier, with subsequent confirmation that version 5.2.1 also remains susceptible to this security weakness. This vulnerability resides within the index.php file and specifically targets the q parameter utilized during search operations, creating a pathway for remote attackers to execute malicious code within the context of affected users' browsers. The flaw demonstrates a critical failure in input validation and output encoding practices, where user-supplied search queries are not properly sanitized before being rendered back to end users, thereby enabling attackers to inject arbitrary web scripts or HTML content.
The technical exploitation of this vulnerability follows established patterns for XSS attacks, where malicious input passed through the q parameter can be executed in the victim's browser context without proper sanitization or encoding. When users perform search operations within the application, the unfiltered input is directly embedded into the web page output, creating an environment where attackers can craft payloads that execute in the victim's browser. This vulnerability aligns with CWE-79, which specifically addresses cross-site scripting flaws in web applications, and represents a fundamental breakdown in the principle of input validation and output encoding that forms the cornerstone of web application security. The attack vector demonstrates how simple parameter manipulation can lead to complex security consequences, as the malicious code can potentially access cookies, session tokens, or perform actions on behalf of authenticated users.
The operational impact of this vulnerability extends beyond simple script execution, as it can enable attackers to perform session hijacking, steal sensitive information, redirect users to malicious sites, or even modify application behavior through client-side attacks. Users who interact with the vulnerable search functionality become unwitting participants in the attack chain, as their browsers execute the injected code without their knowledge. This vulnerability particularly affects web applications that rely heavily on user input for dynamic content generation, making it a significant concern for any application that does not properly validate or encode user-supplied data before outputting it to web pages. The persistence of this vulnerability across multiple versions indicates a fundamental flaw in the application's security architecture rather than a simple oversight.
Mitigation strategies for this vulnerability must address both the immediate code-level fixes and broader architectural improvements to prevent similar issues. The primary remediation involves implementing proper input validation and output encoding mechanisms that sanitize all user-supplied data before it is processed or displayed, with specific attention to the q parameter in search functions. Organizations should implement Content Security Policy headers to limit script execution, employ proper HTML escaping for dynamic content, and conduct comprehensive input validation to prevent malicious payloads from being executed. This vulnerability exemplifies the importance of following security best practices such as those outlined in the OWASP Top Ten and adheres to ATT&CK technique T1203 for exploitation of web application vulnerabilities through input manipulation. Regular security assessments, code reviews focusing on input/output handling, and maintaining up-to-date application versions form essential components of a comprehensive defense strategy against such persistent threats.