CVE-2003-1151 in NETFile Server
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Fastream NETFile Server 6.0.3.588 allows remote attackers to inject arbitrary web script or HTML via the URL, which is displayed on a "404 Not Found" error page.
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Analysis
by VulDB Data Team • 07/17/2025
The vulnerability identified as CVE-2003-1151 represents a classic cross-site scripting flaw within the Fastream NETFile Server version 6.0.3.588, specifically manifesting in the server's handling of malformed URL requests. This issue falls under the broader category of web application security vulnerabilities that have persisted since the early days of internet infrastructure development. The vulnerability arises from the server's failure to properly sanitize user input when constructing error messages, particularly those displayed during 404 Not Found scenarios. When a remote attacker crafts a malicious URL and submits it to the server, the system processes this input without adequate validation or encoding mechanisms, allowing the attacker to inject arbitrary web scripts or HTML code that gets executed in the context of other users' browsers.
The technical exploitation of this vulnerability occurs through the manipulation of URL parameters that the server does not adequately filter or escape before displaying them in error pages. The Fastream NETFile Server, being a file sharing and web serving application, processes user requests and generates responses including error messages when resources cannot be found. During these 404 error conditions, the server incorporates the original URL parameters directly into the HTML response without proper sanitization, creating an environment where malicious scripts can be executed. This flaw directly maps to CWE-79, which defines the common weakness of Cross-site Scripting in web applications, and represents a fundamental failure in input validation and output encoding practices that are now considered standard security measures. The vulnerability demonstrates the critical importance of proper data sanitization and the principle that all user-supplied input should be treated as potentially malicious.
The operational impact of this vulnerability extends beyond simple script execution, as it provides attackers with the capability to perform various malicious activities including session hijacking, data theft, and redirection to malicious sites. When legitimate users encounter the 404 error page containing the injected script, their browsers execute the malicious code, potentially leading to unauthorized access to their sessions, theft of sensitive information, or redirection to phishing sites. The vulnerability affects the entire user base of the affected server, as any user who visits a page containing the malicious URL parameter will be exposed to the attack. This makes the vulnerability particularly dangerous in environments where the server serves multiple users or where users might inadvertently click on links containing malicious parameters. The attack vector is relatively simple and requires minimal technical expertise, making it a common target for automated exploitation tools and script kiddies, while still maintaining significant risk due to the potential for widespread impact.
Mitigation strategies for CVE-2003-1151 should focus on implementing proper input validation and output encoding mechanisms throughout the application. The most effective immediate solution involves ensuring that all user-supplied data, particularly URL parameters, are properly escaped or encoded before being rendered in any HTML context. This approach aligns with the ATT&CK framework's mitigation recommendations for web application security, specifically addressing techniques related to command injection and code execution in web contexts. Organizations should implement comprehensive input validation that filters out potentially dangerous characters and sequences, while also employing output encoding that converts special characters into their HTML-safe equivalents. Additionally, the server should be updated to a newer version that addresses this vulnerability, as Fastream likely released patches or newer versions that properly handle URL parameter sanitization. Network-level protections such as web application firewalls can provide additional defense-in-depth, though they should not be considered a substitute for proper application-level security measures. The vulnerability also underscores the importance of regular security assessments and the implementation of secure coding practices that prevent such flaws from occurring in the first place, particularly emphasizing the need for consistent application of the principle of least privilege and defense-in-depth strategies.