CVE-2006-5609 in TorrentFlux
Summary
by MITRE
Directory traversal vulnerability in dir.php in TorrentFlux 2.1 allows remote attackers to list arbitrary directories via "\.\./" sequences in the dir parameter.
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Analysis
by VulDB Data Team • 04/25/2026
The directory traversal vulnerability identified as CVE-2006-5609 affects TorrentFlux 2.1, a web-based file sharing application that enables users to manage and distribute torrents. This flaw exists in the dir.php component which processes directory listing requests through user-supplied input parameters. The vulnerability stems from inadequate input validation and sanitization mechanisms within the application's file handling routines, specifically when processing directory navigation requests. Attackers can exploit this weakness by manipulating the dir parameter to include malicious "\.\./" sequences that bypass normal directory access controls.
The technical implementation of this vulnerability resides in the application's failure to properly validate and sanitize user input before processing directory navigation requests. When the dir.php script receives a dir parameter containing sequences like "\.\./", it does not adequately filter or normalize these paths before using them in file system operations. This allows attackers to traverse the file system hierarchy and access directories that should normally be restricted. The vulnerability specifically targets the path resolution mechanism within the web application, where the application fails to implement proper path normalization or validation checks that would prevent directory traversal attacks.
The operational impact of this vulnerability is significant as it allows remote attackers to enumerate arbitrary directories on the affected server, potentially exposing sensitive files, configuration data, and system information. An attacker could leverage this vulnerability to access not only publicly accessible directories but potentially private files, user data, and system configuration files that should remain protected. This type of exposure can lead to information disclosure, system reconnaissance, and potential further exploitation opportunities. The vulnerability essentially provides an attacker with unauthorized directory listing capabilities that could reveal the underlying file system structure and potentially sensitive data stored on the server.
This vulnerability maps to CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The flaw aligns with ATT&CK technique T1083, which covers discovering file and directory permissions, as it allows adversaries to access directories they should not normally be able to reach. The vulnerability also relates to T1213, which involves data from information repositories, as it enables unauthorized access to potentially sensitive files within the application's file system. Organizations running affected versions of TorrentFlux should implement immediate mitigations including input validation, path normalization, and proper access controls to prevent unauthorized directory traversal.
The recommended mitigations for this vulnerability include implementing strict input validation and sanitization for all user-supplied directory parameters, normalizing file paths before processing, and enforcing proper access controls that prevent traversal beyond designated directories. Application developers should implement whitelisting mechanisms that only allow access to pre-approved directories and reject any input containing path traversal sequences. Additionally, the web server configuration should be reviewed to ensure that file system access is properly restricted and that the application operates within a secure sandboxed environment. Regular security updates and patches should be applied to address similar vulnerabilities in web applications, and input validation should be implemented at multiple layers of the application architecture to prevent similar issues from occurring in other components.