CVE-2017-8297 in Simple PHP File Manager
Summary
by MITRE
A path traversal vulnerability exists in simple-file-manager before 2017-04-26, affecting index.php (the sole "Simple PHP File Manager" component).
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Analysis
by VulDB Data Team • 12/02/2022
The vulnerability identified as CVE-2017-8297 represents a critical path traversal flaw in the Simple PHP File Manager application, a widely used open-source file management tool that allows users to browse, upload, download, and manage files on web servers through a graphical interface. This vulnerability specifically affects the index.php file which serves as the primary component of the file manager, making it a focal point for exploitation attempts. The flaw enables attackers to access files and directories outside the intended web root directory, potentially leading to unauthorized data access, system compromise, and information disclosure. The vulnerability was present in versions prior to the 2017-04-26 release, indicating that the developers had not yet addressed this security weakness in their codebase. This type of vulnerability falls under the CWE-22 category, which specifically addresses path traversal or directory traversal attacks, where an attacker manipulates input to access files and directories beyond the intended scope of the application.
The technical implementation of this path traversal vulnerability stems from inadequate input validation and sanitization within the file manager's core functionality. When users interact with the application through the index.php interface, the application fails to properly validate or sanitize user-supplied parameters that control file paths and directory navigation. Attackers can exploit this weakness by manipulating URL parameters or form inputs to include directory traversal sequences such as '../' or '..\'. The vulnerability occurs because the application directly incorporates user input into file system operations without proper sanitization or validation, allowing malicious actors to navigate to arbitrary locations within the server's file system. This flaw is particularly dangerous because it can be exploited through simple HTTP requests, making it accessible to attackers with minimal technical expertise. The vulnerability's impact is amplified by the fact that many file managers like Simple PHP File Manager are installed in web-accessible directories, providing direct attack surfaces for remote exploitation.
The operational impact of CVE-2017-8297 extends far beyond simple unauthorized file access, potentially enabling complete system compromise and data breaches. An attacker who successfully exploits this vulnerability can access sensitive system files, configuration data, database credentials, and potentially gain access to other applications running on the same server. The attack surface is particularly concerning in environments where the file manager is installed in directories accessible to web users, as it provides an easy entry point for attackers seeking to escalate privileges or extract valuable information. This vulnerability can be leveraged in conjunction with other attack vectors, such as exploiting weak server configurations or combining it with other vulnerabilities to achieve persistent access to systems. The implications are particularly severe in web hosting environments, shared hosting platforms, or any scenario where multiple users or applications share the same server infrastructure, as the vulnerability could allow attackers to access files belonging to other users or applications. From an ATT&CK framework perspective, this vulnerability maps to T1083 (File and Directory Discovery) and T1566 (Phishing for Information), as attackers can use it to discover system files and extract sensitive data through automated reconnaissance and exploitation techniques.
Organizations affected by this vulnerability should implement immediate mitigation strategies to protect their systems from exploitation attempts. The primary and most effective mitigation is to upgrade to the patched version of Simple PHP File Manager released after April 26, 2017, which addresses the path traversal vulnerability through proper input validation and sanitization. Additionally, administrators should implement proper access controls and ensure that file manager applications are not installed in web-accessible directories or are properly secured with authentication mechanisms. Network-level protections such as web application firewalls can help detect and block exploitation attempts, while regular security audits should verify that no instances of the vulnerable software remain in production environments. The vulnerability also underscores the importance of proper input validation practices, which should be implemented across all web applications to prevent similar path traversal issues. Organizations should consider implementing principle of least privilege access controls, ensuring that file manager applications have minimal required permissions and are restricted from accessing sensitive system directories. Regular security updates and patch management processes are essential for maintaining protection against known vulnerabilities, as this particular flaw demonstrates how quickly attackers can exploit unpatched software in widely deployed applications.