CVE-2006-6600 in torrentflux-b4rt
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in dir.php in TorrentFlux 2.2, when allows remote attackers to inject arbitrary web script or HTML via double URL-encoded strings in the dir parameter, a related issue to CVE-2006-5609.
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Analysis
by VulDB Data Team • 10/04/2017
The vulnerability identified as CVE-2006-6600 represents a cross-site scripting flaw within the TorrentFlux 2.2 web application, specifically affecting the dir.php script. This issue allows remote attackers to execute malicious web scripts or HTML code within the context of other users' browsers. The vulnerability manifests when the application fails to properly sanitize or encode user input passed through the dir parameter, creating an opening for attackers to inject malicious content that gets executed in the victim's browser environment. The flaw is particularly concerning because it leverages double URL-encoded strings, which indicates a sophisticated approach to bypassing basic input validation mechanisms that might only check for simple encoding patterns. This vulnerability directly relates to CVE-2006-5609, suggesting a pattern of similar weaknesses within the TorrentFlux application's input handling processes.
The technical implementation of this vulnerability stems from inadequate input validation and output encoding practices within the dir.php component. When users provide input through the dir parameter, the application processes this data without sufficient sanitization measures to prevent the execution of malicious scripts. The use of double URL encoding demonstrates that attackers can circumvent basic security filters by encoding their payloads multiple times, making the vulnerability more persistent and harder to detect through simple security scanning tools. This approach aligns with common XSS attack methodologies where attackers encode their malicious payloads to bypass security controls that only inspect the initial encoding level of input data. The vulnerability operates under CWE-79 which specifically addresses Cross-Site Scripting flaws in software applications, making it a well-documented category of web application security weakness. The flaw represents a classic case of unsafe output encoding where user-provided data flows directly into web page output without proper sanitization.
The operational impact of CVE-2006-6600 extends beyond simple script injection, potentially allowing attackers to perform session hijacking, redirect users to malicious websites, steal sensitive information, or manipulate the application's functionality from within the victim's browser context. An attacker could craft malicious URLs that, when clicked by an unsuspecting user, would execute scripts that steal session cookies or redirect the user to phishing sites. This vulnerability could be exploited in conjunction with social engineering tactics to amplify the attack surface significantly. The impact is particularly severe in environments where TorrentFlux is used for file sharing or community-based applications, as users may trust the application interface and inadvertently execute malicious code. The vulnerability affects the integrity of the web application and can compromise user data, potentially leading to unauthorized access to shared files or personal information. According to ATT&CK framework, this vulnerability maps to T1566 which covers social engineering techniques, and T1059 which involves command and scripting interpreters, as the malicious scripts can execute commands within the browser environment.
Mitigation strategies for CVE-2006-6600 should focus on implementing proper input validation and output encoding mechanisms throughout the application. The most effective approach involves sanitizing all user input parameters, particularly those used in dynamic content generation, and ensuring that output is properly encoded before being rendered in the browser. Applications should implement a whitelist approach to validate input parameters against expected patterns and reject any input that does not conform to predefined security rules. The implementation of Content Security Policy headers can provide additional protection by restricting the sources from which scripts can be loaded and executed within the application context. Regular security updates and patches should be applied to ensure that known vulnerabilities are addressed promptly. Organizations should also consider implementing web application firewalls that can detect and block suspicious input patterns, including double URL-encoded strings that are commonly used in XSS attacks. Security awareness training for developers on secure coding practices and the importance of input validation can help prevent similar vulnerabilities from being introduced in future versions of the application. The vulnerability serves as a reminder of the critical importance of proper input validation and output encoding in preventing cross-site scripting attacks, which remain one of the most prevalent and dangerous web application security threats.