CVE-2009-2889 in Hangman
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.php in PHP Scripts Now Hangman allows remote attackers to inject arbitrary web script or HTML via the letters parameter.
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Analysis
by VulDB Data Team • 07/30/2025
The CVE-2009-2889 vulnerability represents a classic cross-site scripting flaw in the PHP Scripts Now Hangman application, specifically within the index.php file where the letters parameter is improperly handled. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, which is one of the most prevalent and dangerous web application security flaws identified by the CWE organization. The vulnerability arises from insufficient input validation and output encoding mechanisms that fail to properly sanitize user-supplied data before it is rendered back to the browser.
The technical exploitation of this vulnerability occurs when an attacker crafts malicious input containing script tags or HTML elements within the letters parameter of the hangman game interface. When the application processes this parameter without adequate sanitization, the malicious code becomes embedded in the page's HTML output and executes in the context of other users' browsers who view the affected page. This creates a persistent threat where legitimate users can unknowingly execute malicious scripts that may steal session cookies, redirect to phishing sites, or perform other harmful actions on behalf of the victim.
The operational impact of this vulnerability extends beyond simple script execution as it enables attackers to manipulate the application's user interface and potentially compromise user sessions. Since the hangman game is likely designed for user interaction, the attack surface includes any user who interacts with the compromised page, making it particularly dangerous in multi-user environments where the application might be used for educational or collaborative purposes. The vulnerability also represents a significant risk for web applications that rely on user-generated content, as it demonstrates how seemingly innocuous input fields can become attack vectors for more sophisticated exploitation techniques.
Mitigation strategies for CVE-2009-2889 should focus on implementing robust input validation and output encoding practices that align with established security frameworks. The primary defense mechanism involves proper sanitization of all user inputs, particularly those that are directly rendered back to the browser. This approach corresponds to ATT&CK technique T1566.001 for Phishing and T1203 for Exploitation for Client Execution, where the initial compromise occurs through user interaction with malicious content. Organizations should implement Content Security Policy headers, utilize proper HTML escaping mechanisms, and ensure that all dynamic content is properly encoded before insertion into web pages. Additionally, regular security code reviews and automated vulnerability scanning should be integrated into the development lifecycle to identify similar patterns that might exist in other application components. The vulnerability also highlights the importance of following secure coding practices as outlined in OWASP Top 10 and NIST Cybersecurity Framework guidelines for preventing injection vulnerabilities in web applications.