CVE-2008-3305 in YouTube Blog
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in mensaje.php in C. Desseno YouTube Blog (ytb) 0.1 allows remote attackers to inject arbitrary web script or HTML via the m parameter.
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Analysis
by VulDB Data Team • 11/02/2024
The vulnerability identified as CVE-2008-3305 represents a classic cross-site scripting flaw within the C. Desseno YouTube Blog (ytb) version 0.1 content management system. This security weakness resides in the mensaje.php script which fails to properly validate or sanitize user input before incorporating it into web page responses. The specific parameter m serves as the attack vector where malicious actors can inject arbitrary web scripts or HTML content that gets executed in the context of other users' browsers. This type of vulnerability falls under the Common Weakness Enumeration category CWE-79, which specifically addresses improper neutralization of input during web page generation, making it a well-documented and widely recognized web application security flaw.
The technical implementation of this vulnerability stems from the application's failure to implement proper input sanitization mechanisms. When the m parameter is submitted through user requests, the mensaje.php script directly incorporates this input into dynamically generated web content without adequate filtering or encoding of potentially malicious content. This allows attackers to craft specially crafted URLs containing script tags or other HTML elements that execute when the page loads in a victim's browser. The vulnerability demonstrates a fundamental lack of output encoding and input validation practices that are essential for preventing XSS attacks in web applications.
Operationally, this vulnerability presents significant risks to both administrators and end-users of the affected blog platform. Remote attackers can exploit this flaw to execute malicious scripts in the context of other users' sessions, potentially leading to session hijacking, credential theft, or redirection to malicious websites. The impact extends beyond simple script execution as attackers could leverage this vulnerability to perform actions on behalf of authenticated users, depending on the application's access controls and user permissions. This type of vulnerability is particularly dangerous in blog environments where users may have varying levels of privileges and where the injected content could compromise the entire user base.
Mitigation strategies for CVE-2008-3305 should focus on implementing comprehensive input validation and output encoding mechanisms. The primary fix involves sanitizing all user-supplied input through proper encoding before incorporating it into web page content, particularly for HTML, JavaScript, and URL contexts. Organizations should implement Content Security Policy headers to limit script execution capabilities and employ proper input validation libraries that can identify and neutralize potentially malicious content. The solution aligns with ATT&CK technique T1203 which involves exploiting web application vulnerabilities to gain unauthorized access, and follows the remediation approaches recommended for CWE-79. Additionally, regular security testing including automated vulnerability scanning and manual penetration testing should be conducted to identify similar input validation weaknesses in other application components. The vulnerability serves as a reminder of the critical importance of implementing defense-in-depth strategies that include both server-side input validation and client-side output encoding to prevent cross-site scripting attacks.