CVE-2009-4908 in oBlog
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in oBlog allow remote attackers to inject arbitrary web script or HTML via the (1) commentName, (2) commentEmail, (3) commentWeb, or (4) commentText parameter to article.php; and allow remote authenticated administrators to inject arbitrary web script or HTML via the (5) article_id or (6) title parameter to admin/write.php, the (7) category_id or (8) category_name parameter to admin/groups.php, the (9) blogroll_id or (10) title parameter to admin/blogroll.php, or the (11) blog_name or (12) tag_line parameter to admin/settings.php.
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Analysis
by VulDB Data Team • 07/19/2025
The vulnerability described in CVE-2009-4908 represents a critical cross-site scripting flaw affecting the oBlog content management system. This vulnerability manifests across multiple endpoints within the application, creating a comprehensive attack surface that spans both public comment submission and administrative functions. The flaw exists due to insufficient input validation and output encoding mechanisms within the web application's processing pipeline, allowing malicious actors to inject malicious scripts that execute in the context of other users' browsers. The vulnerability impacts both unauthenticated users who can submit comments and authenticated administrators who have access to various administrative panels, significantly expanding the potential attack vectors and exploitation scope.
The technical implementation of this vulnerability stems from the application's failure to properly sanitize user-supplied input across multiple parameters. In the public comment submission pathway through article.php, the parameters commentName, commentEmail, commentWeb, and commentText all lack adequate validation mechanisms, allowing attackers to inject malicious payloads that persist in the application's database and execute when other users view the affected content. The administrative components present additional attack vectors through write.php, groups.php, blogroll.php, and settings.php, where parameters such as article_id, title, category_id, category_name, blogroll_id, title, blog_name, and tag_line all suffer from the same sanitization deficiencies. This pattern of vulnerability demonstrates a systemic flaw in the application's security architecture where input validation is inconsistently applied across different modules and functions.
The operational impact of this vulnerability extends far beyond simple script injection, creating potential for severe consequences including session hijacking, credential theft, and unauthorized administrative access. When authenticated administrators interact with the vulnerable parameters, attackers can exploit these flaws to manipulate the application's administrative functions, potentially leading to complete system compromise. The persistence of these vulnerabilities through database storage means that malicious payloads can affect multiple users over extended periods, making the attack surface particularly dangerous for sustained exploitation. According to CWE classification, this vulnerability maps to CWE-79 which specifically addresses cross-site scripting flaws, while the attack patterns align with ATT&CK techniques targeting web application vulnerabilities through input validation bypasses.
Mitigation strategies for this vulnerability require immediate implementation of comprehensive input sanitization and output encoding measures across all affected parameters. The most effective approach involves implementing strict validation rules that reject or escape potentially malicious input before it is processed or stored in the database. Additionally, developers should implement proper output encoding mechanisms that ensure any user-supplied content is rendered safely in web contexts, preventing script execution regardless of how the content is subsequently displayed. Regular security audits and input validation testing should be conducted to identify and remediate similar vulnerabilities in other application components. The implementation of Content Security Policy headers can provide additional defense-in-depth protection against exploitation of these vulnerabilities, while proper access controls and privilege separation can limit the damage that authenticated attackers can cause. Organizations should also implement web application firewalls and regular vulnerability scanning to detect and prevent exploitation attempts targeting these specific parameters.