CVE-2007-4376 in Best Top List
Summary
by MITRE
Unrestricted file upload vulnerability in banner-upload.php in Szymon Kosok Best Top List allows remote attackers to upload and execute arbitrary PHP files in banners/.
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Analysis
by VulDB Data Team • 11/03/2017
The vulnerability identified as CVE-2007-4376 represents a critical unrestricted file upload flaw within the banner-upload.php component of Szymon Kosok Best Top List web application. This vulnerability resides in the banners/ directory where the application fails to properly validate file types during the upload process, creating a pathway for malicious actors to bypass security controls and execute arbitrary code on the target system. The flaw specifically affects the file upload functionality that handles banner images and other media content, allowing remote attackers to submit PHP files without proper authorization or validation.
This vulnerability falls under the category of CWE-434 Unrestricted Upload of File with Dangerous Type, which is classified as a serious security weakness in software applications. The issue enables attackers to upload malicious PHP scripts that can be executed within the web server context, potentially leading to complete system compromise. The vulnerability is particularly dangerous because it allows for arbitrary code execution, which aligns with ATT&CK technique T1190 Exploit Public-Facing Application and T1059 Command and Scripting Interpreter. The lack of proper input validation and file type checking creates an environment where attackers can upload web shells, backdoors, or other malicious payloads that persist on the server.
The operational impact of this vulnerability extends beyond simple code execution, as it can lead to complete server compromise, data exfiltration, and potential lateral movement within the network. Attackers can leverage this vulnerability to establish persistent access, deploy additional malicious tools, or use the compromised server as a staging point for further attacks. The vulnerability affects the confidentiality, integrity, and availability of the web application and underlying systems, as unauthorized users can manipulate the server to perform actions they should not be permitted to execute. This type of vulnerability is particularly concerning in web applications where user-uploaded content is processed without adequate sanitization or validation.
Mitigation strategies for CVE-2007-4376 should include immediate implementation of proper file type validation, restricting uploads to specific safe file extensions, and ensuring that uploaded files are stored outside the web root directory. Security measures should enforce strict content validation, implement proper file extension checking, and utilize secure file handling practices. Organizations should also deploy web application firewalls, implement proper access controls, and conduct regular security audits to identify and remediate similar vulnerabilities. The fix typically involves modifying the banner-upload.php script to validate file types, implement proper MIME type checking, and ensure that uploaded files are not directly executable within the web context. Additionally, regular security updates and vulnerability assessments should be conducted to prevent similar issues from occurring in other components of the web application.