CVE-2009-4903 in oBlog
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in index.php in oBlog allows remote attackers to inject arbitrary web script or HTML via the search parameter. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 12/28/2017
The vulnerability described in CVE-2009-4903 represents a classic cross-site scripting flaw within the oBlog content management system, specifically affecting the index.php file. This type of vulnerability falls under the broader category of web application security weaknesses that have been consistently identified as critical threats to user data and application integrity. The issue manifests when the application fails to properly validate or sanitize user input received through the search parameter, creating an avenue for malicious actors to inject arbitrary web scripts or HTML code into the application's response. The vulnerability's classification as a remote attack vector means that threat actors can exploit this flaw without requiring physical access to the target system, making it particularly dangerous in web-based environments where applications are accessible over networks.
The technical implementation of this XSS vulnerability stems from inadequate input sanitization mechanisms within the oBlog platform's search functionality. When users submit search queries through the index.php interface, the application processes these inputs without sufficient validation or encoding measures that would prevent malicious scripts from being executed in the context of other users' browsers. This processing flaw creates an environment where attacker-controlled content can be seamlessly integrated into the application's output, allowing for the execution of unauthorized scripts within the victim's browser context. The vulnerability specifically targets the search parameter, which represents one of the most commonly used input fields in web applications, making it an attractive target for exploitation. According to CWE classification, this vulnerability maps to CWE-79, which describes improper neutralization of input during web page generation, a fundamental weakness in web application security that has been documented across numerous applications and platforms.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to perform various malicious activities including session hijacking, credential theft, data exfiltration, and redirection to malicious websites. When exploited, the XSS flaw allows attackers to execute scripts in the context of authenticated users, potentially compromising user sessions and gaining unauthorized access to sensitive information. The remote nature of the attack means that threat actors can leverage this vulnerability from anywhere on the internet, without requiring any local system access or specialized equipment. This characteristic significantly increases the attack surface and makes the vulnerability particularly attractive to automated exploitation tools that scan for common web application flaws. From an attacker's perspective, this vulnerability provides a foundation for more sophisticated attacks such as credential harvesting through form grabbing techniques or creating malicious redirects that can lead to further exploitation of the compromised user's browsing session.
Mitigation strategies for this CVE-2009-4903 vulnerability must focus on implementing robust input validation and output encoding mechanisms throughout the application's codebase. The most effective remediation involves sanitizing all user inputs, particularly those used in dynamic content generation, by employing proper encoding techniques such as HTML entity encoding for output contexts. Additionally, implementing Content Security Policy (CSP) headers can provide an additional layer of protection by restricting the sources from which scripts can be executed within the browser context. Organizations should also consider implementing proper input validation frameworks that can identify and reject malicious payloads before they are processed by the application. The remediation process should include thorough code reviews and security testing to ensure that all input handling mechanisms properly address potential XSS attack vectors. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059.007 (Scripting) and T1566.001 (Phishing via Social Engineering), highlighting the need for comprehensive defensive measures that address both the technical implementation and the broader threat landscape. Regular security updates and patch management processes should be established to ensure that known vulnerabilities like this one are promptly addressed, preventing attackers from leveraging these flaws to compromise user systems and data integrity.