CVE-2009-2771 in Free Arcade Script
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Free Arcade Script 1.3 allows remote attackers to inject arbitrary web script or HTML via the keyword parameter to the default URI under search/.
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Analysis
by VulDB Data Team • 08/15/2017
The CVE-2009-2771 vulnerability represents a classic cross-site scripting flaw in the Free Arcade Script version 1.3, specifically targeting the search functionality of the web application. This vulnerability resides in the handling of user input through the keyword parameter within the search URI path, making it a prime example of insecure input validation and output encoding practices that have plagued web applications for decades. The flaw demonstrates how seemingly benign search parameters can become attack vectors when proper sanitization measures are absent from the application code. This vulnerability type falls under the CWE-79 category, which specifically addresses cross-site scripting vulnerabilities in web applications, and aligns with the ATT&CK technique T1190 for exploitation of web application vulnerabilities. The vulnerability is particularly concerning because it allows remote attackers to execute arbitrary web scripts or HTML code within the context of a victim's browser session, potentially enabling session hijacking, data theft, or further malicious activities.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing script code within the keyword parameter of the search URI. When the Free Arcade Script processes this input without proper sanitization or encoding, the malicious payload gets embedded directly into the web page response. This allows the attacker to inject JavaScript code that executes in the victim's browser when they view the search results page. The vulnerability specifically targets the default URI path under the search functionality, making it accessible through standard web application navigation patterns. The flaw essentially bypasses the application's input validation mechanisms, treating user-supplied content as trusted content that can be rendered directly to the browser without proper context-aware encoding or sanitization. This represents a fundamental failure in the application's security architecture, where the principle of least privilege and proper input validation is not enforced at the application layer.
The operational impact of this vulnerability extends beyond simple script injection, as it provides attackers with the capability to compromise user sessions and potentially gain unauthorized access to sensitive information. When exploited, the XSS vulnerability could enable attackers to steal cookies, session tokens, or other sensitive data that users might have in their browser sessions. The vulnerability also opens the door for more sophisticated attacks such as credential harvesting, redirection to malicious sites, or the deployment of browser-based malware. Given that this is a web application vulnerability, the attack surface is broad and accessible, as it does not require any special privileges or physical access to the target system. The impact is particularly severe in environments where users might have administrative privileges or access to sensitive data through the arcade script application, as the attacker could potentially escalate privileges or access restricted information through the injected scripts.
Mitigation strategies for CVE-2009-2771 should focus on implementing robust input validation and output encoding mechanisms throughout the Free Arcade Script application. The primary defense involves proper sanitization of all user-supplied input, particularly parameters used in dynamic content generation such as the keyword parameter in search functionality. Implementing context-aware output encoding ensures that any potentially malicious content is rendered harmless when displayed in web pages. The application should employ strict input validation that filters or rejects suspicious characters and patterns commonly associated with XSS attacks. Additionally, implementing a Content Security Policy (CSP) header can provide an additional layer of protection by restricting the sources from which scripts can be loaded and executed. Regular security code reviews and penetration testing should be conducted to identify similar vulnerabilities in other parts of the application. The remediation process must also include updating the Free Arcade Script to a newer version that addresses this vulnerability, as version 1.3 is likely to contain multiple other security flaws that could compound the risk. Organizations should also implement web application firewalls and monitoring systems to detect and prevent exploitation attempts. The vulnerability serves as a reminder of the critical importance of secure coding practices and the necessity of adhering to security standards such as those defined in the OWASP Top Ten and the CWE database to prevent similar issues in future web application deployments.