CVE-2003-0832 in webfs
Summary
by MITRE
Directory traversal vulnerability in webfs before 1.20 allows remote attackers to read arbitrary files via .. (dot dot) sequences in a Hostname header.
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Analysis
by VulDB Data Team • 07/20/2025
The vulnerability identified as CVE-2003-0832 represents a critical directory traversal flaw in the webfs web server software prior to version 1.20. This vulnerability specifically affects the handling of HTTP requests where the Hostname header is processed without proper input validation or sanitization. The flaw enables remote attackers to exploit the web server by crafting malicious requests that contain .. (dot dot) sequences within the Hostname header, allowing them to navigate the file system hierarchy and access files that should remain protected or restricted.
The technical implementation of this vulnerability stems from inadequate input validation mechanisms within the webfs application. When processing HTTP requests, the software fails to properly sanitize or validate the Hostname header value, which is typically used to determine the target server for virtual hosting purposes. The absence of proper path traversal checks means that when .. sequences are present in the header, the web server interprets these as navigation commands that can traverse upward through the directory structure. This behavior aligns with CWE-22, which categorizes directory traversal vulnerabilities as weaknesses that allow attackers to access files outside the intended directory scope through manipulation of file paths.
The operational impact of this vulnerability is severe and far-reaching for any system running affected versions of webfs. Remote attackers can leverage this weakness to access sensitive files including configuration files, password databases, system logs, and potentially confidential application data. The vulnerability essentially provides an attacker with arbitrary file reading capabilities, which can lead to complete system compromise if sensitive files such as database credentials, application secrets, or system configuration details are accessible. This type of vulnerability falls under ATT&CK technique T1566.001, which describes the exploitation of remote services through the use of directory traversal attacks, and represents a fundamental security flaw that undermines the principle of least privilege and proper access controls.
Mitigation strategies for CVE-2003-0832 primarily involve upgrading to webfs version 1.20 or later, which includes proper input validation and sanitization for the Hostname header. Organizations should also implement network-level protections such as firewall rules that restrict access to the web server and monitor for suspicious header patterns. Additional defensive measures include deploying web application firewalls that can detect and block malicious .. sequences in HTTP headers, implementing proper input validation at multiple layers of the application architecture, and conducting regular security audits of web server configurations. The vulnerability demonstrates the critical importance of validating all user-supplied input, particularly in HTTP headers, and serves as a reminder that even seemingly benign parameters like Hostname can become attack vectors when not properly sanitized. Security practitioners should also consider implementing automated vulnerability scanning tools that can detect similar directory traversal patterns in other web applications and services, as this type of weakness remains prevalent in many web server implementations across different platforms and technologies.