CVE-2007-4371 in Neuron Blog
Summary
by MITRE
Unrestricted file upload vulnerability in admin/pages/blog-add.php in Neuron Blog 1.1 allows remote attackers to upload and execute arbitrary PHP files in uploads/.
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Analysis
by VulDB Data Team • 08/12/2017
The vulnerability identified as CVE-2007-4371 represents a critical unrestricted file upload flaw within the Neuron Blog 1.1 content management system. This vulnerability exists in the administrative component of the application at the file path admin/pages/blog-add.php which processes blog post additions. The flaw allows remote attackers to bypass file validation mechanisms and upload malicious files directly to the server's upload directory, creating a significant security risk for systems running this version of the blog platform.
The technical nature of this vulnerability stems from inadequate input validation and sanitization within the file upload functionality. When administrators or authenticated users attempt to add blog content, the application fails to properly verify the file types being uploaded, particularly allowing PHP files to be stored in the uploads/ directory without proper restrictions. This weakness falls under the Common Weakness Enumeration category CWE-434, which specifically addresses insecure file upload vulnerabilities where applications accept files without proper validation of their content or type. The vulnerability enables attackers to execute arbitrary code on the target system through the uploaded PHP files, potentially leading to complete system compromise.
The operational impact of this vulnerability is severe and multifaceted. Remote attackers can leverage this flaw to upload web shells, malicious scripts, or other harmful payloads that persist on the server. Once uploaded, these files can be executed by the web server, allowing attackers to perform various malicious activities including data exfiltration, privilege escalation, and establishing persistent access to the compromised system. The vulnerability affects the confidentiality, integrity, and availability of the web application and underlying infrastructure, as attackers can manipulate the server environment and potentially use it as a launching point for further attacks against internal networks. This vulnerability directly aligns with ATT&CK technique T1190, which covers the exploitation of vulnerabilities in web applications to gain initial access and execute arbitrary code.
Mitigation strategies for this vulnerability require immediate implementation of multiple defensive measures. Organizations should apply the latest security patches provided by the Neuron Blog developers to address this specific flaw. Additionally, implementing strict file type validation and content checking mechanisms within the application is essential to prevent unauthorized file uploads. The upload directory should be configured with appropriate permissions that prevent execution of uploaded files, and the application should be configured to store uploaded files outside the web root directory. Network-level protections including web application firewalls and intrusion detection systems can help detect and block suspicious upload attempts. Regular security audits and vulnerability assessments should be conducted to identify similar flaws in other components of the web application stack, and the principle of least privilege should be enforced to minimize the impact of potential exploitation. The vulnerability also underscores the importance of following secure coding practices and implementing proper input validation as recommended in OWASP Top Ten security guidelines.