CVE-2008-2668 in yBlog
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in yBlog 0.2.2.2 allow remote attackers to inject arbitrary web script or HTML via (1) the q parameter to search.php, or the n parameter to (2) user.php or (3) uss.php.
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Analysis
by VulDB Data Team • 10/27/2024
The vulnerability identified as CVE-2008-2668 represents a critical cross-site scripting flaw affecting yBlog version 0.2.2.2, a content management system that was widely used for blog hosting and management. This vulnerability falls under the category of CWE-79 - Improper Neutralization of Input During Web Page Generation, which is a fundamental weakness in web application security where user-supplied data is not properly sanitized before being rendered in web pages. The flaw specifically manifests in three distinct endpoints of the application where user input is directly incorporated into the response without adequate validation or encoding mechanisms. The affected parameters include the q parameter in search.php, and the n parameter in both user.php and uss.php, creating multiple attack vectors that could be exploited by malicious actors.
The technical exploitation of this vulnerability occurs when remote attackers submit malicious payloads through these input parameters, which are then executed in the browsers of unsuspecting users who visit the affected pages. When the application processes these parameters without proper sanitization, the injected scripts become part of the dynamic web page content and execute in the context of the victim's browser session. This allows attackers to perform various malicious activities including session hijacking, credential theft, defacement of the blog content, or redirection to malicious websites. The vulnerability is particularly dangerous because it affects core functionality components of the blog system, making it accessible through normal user interactions such as searching for content or viewing user profiles, which are common activities that users perform regularly.
The operational impact of CVE-2008-2668 extends beyond simple data theft or content manipulation to potentially compromise the entire user base of the affected blog system. Attackers could leverage this vulnerability to inject persistent XSS payloads that would affect all users visiting the compromised pages, effectively creating a backdoor for ongoing malicious activities. The vulnerability also aligns with ATT&CK technique T1566.001 - Phishing: Spearphishing Attachment, as attackers could craft malicious payloads that exploit this vulnerability to deliver additional malware or steal user credentials. Organizations using yBlog 0.2.2.2 would face significant reputational damage and potential legal consequences if user data was compromised through such attacks. The vulnerability demonstrates poor input validation practices that are common in legacy web applications, where security considerations were not adequately integrated into the development lifecycle.
Mitigation strategies for CVE-2008-2668 should focus on immediate input sanitization and output encoding measures to prevent malicious scripts from executing in user browsers. The most effective remediation involves implementing proper parameter validation and HTML escaping for all user-supplied input across the affected endpoints. Developers should apply context-specific encoding mechanisms such as HTML entity encoding for content displayed in web pages, and implement Content Security Policy headers to limit script execution capabilities. Organizations should also consider implementing Web Application Firewalls to detect and block suspicious input patterns targeting these specific parameters. Additionally, the vulnerability highlights the importance of regular security audits and penetration testing to identify similar issues in legacy applications. The remediation process should include comprehensive code review to ensure all input parameters are properly validated, and developers should follow secure coding practices such as those outlined in the OWASP Secure Coding Practices to prevent similar vulnerabilities from being introduced in future versions. Given that yBlog 0.2.2.2 is a legacy system, organizations should also plan for migration to more modern, secure content management platforms that have better security track records and regular security updates.