CVE-2006-5227 in TorrentFlux
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in admin.php in TorrentFlux 2.1 allows remote attackers to inject arbitrary web script or HTML via (1) the $user_agent variable, probably obtained from the User-Agent HTTP header, and possibly (2) the $ip_resolved variable.
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Analysis
by VulDB Data Team • 04/24/2026
This cross-site scripting vulnerability exists in the administrative interface of TorrentFlux 2.1 software, specifically within the admin.php file where user input is not properly sanitized before being rendered in web responses. The flaw manifests when the application processes the User-Agent HTTP header and potentially IP resolution data without adequate input validation or output encoding mechanisms. Attackers can exploit this vulnerability by crafting malicious User-Agent strings that contain embedded JavaScript code or HTML content, which gets executed in the context of other users' browsers when they access the administrative interface. The vulnerability affects the $user_agent variable which is typically populated from the HTTP User-Agent header and potentially the $ip_resolved variable that may contain IP address information from resolved hostnames. This represents a classic reflected cross-site scripting scenario where malicious input flows directly from the request to the response without proper sanitization, allowing attackers to execute arbitrary scripts in victims' browsers with the privileges of the affected user.
The technical impact of this vulnerability enables attackers to perform session hijacking, defacement of administrative interfaces, data exfiltration, and potential privilege escalation within the TorrentFlux application. When users with administrative privileges access the compromised admin.php page, their browsers execute the injected malicious code, which could redirect them to malicious sites, steal session cookies, or modify administrative settings. The vulnerability is particularly concerning because it targets the administrative interface, providing attackers with elevated privileges to manipulate the entire torrent management system. According to CWE standards, this maps to CWE-79 which describes improper neutralization of input during web page generation, specifically in the context of reflected cross-site scripting. The attack surface is broad as any user with access to the administrative interface can become a vector for this attack, and the User-Agent header is automatically sent by all web browsers, making this vector particularly easy to exploit.
The operational impact extends beyond simple script execution to potentially compromise the entire TorrentFlux installation and underlying network infrastructure. Attackers could use this vulnerability to establish persistent backdoors, modify torrent configurations, access sensitive user data, or even gain unauthorized access to the server hosting the application. The reflected nature of this XSS attack means that the malicious payload does not need to be stored on the server, making detection more challenging for security monitoring systems. From an ATT&CK framework perspective, this vulnerability aligns with T1059.007 for command and scripting interpreter and T1566.001 for spearphishing via web applications, as it enables initial access through web-based exploitation and subsequent command execution within the victim's browser context. The vulnerability also demonstrates poor input validation practices and highlights the critical importance of implementing proper output encoding and content security policies to prevent such attacks. Organizations using TorrentFlux 2.1 should immediately implement input sanitization measures, apply output encoding to all user-controllable data, and consider implementing Content Security Policy headers to mitigate the risk of XSS exploitation. The vulnerability underscores the necessity of regular security audits and input validation across all web application components, particularly those handling user-provided data in administrative contexts.