CVE-2003-0313 in Web Server
Summary
by MITRE
Directory traversal vulnerability in Snowblind Web Server 1.0 allows remote attackers to list arbitrary directory contents via a ... (triple dot) in an HTTP request.
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Analysis
by VulDB Data Team • 05/03/2019
The CVE-2003-0313 vulnerability represents a critical directory traversal flaw in the Snowblind Web Server version 1.0 that exposes fundamental security weaknesses in web application input validation and path handling mechanisms. This vulnerability specifically manifests when the server processes HTTP requests containing triple dot sequences that are interpreted as directory navigation commands, allowing unauthorized access to arbitrary file system locations beyond the intended web root directory. The flaw stems from inadequate sanitization of user-supplied input data, particularly HTTP request parameters that contain path traversal sequences.
The technical implementation of this vulnerability leverages the universal nature of directory traversal attacks where malicious actors can manipulate URL paths using sequences like ../../ or .../ to navigate up directory trees and access sensitive files. In the context of Snowblind Web Server 1.0, when processing these malformed requests, the server fails to properly validate or sanitize the input paths, resulting in the execution of directory traversal operations that reveal directory listings and potentially sensitive files such as configuration data, source code, or user information. This vulnerability directly maps to CWE-22 which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks.
From an operational impact perspective, this vulnerability presents significant risks to web server security and data integrity, as it allows remote attackers to enumerate directory structures and potentially access confidential information without authentication. The implications extend beyond simple directory listing to potential exposure of sensitive system files, configuration parameters, and application source code that could aid in further exploitation attempts. Attackers could leverage this vulnerability to gain insights into the server architecture, identify potential attack vectors, and access restricted resources that should only be available to authorized users.
The security implications of CVE-2003-0313 align with ATT&CK technique T1083 which covers directory and file system discovery, demonstrating how attackers can systematically explore file systems to identify valuable targets. Organizations using vulnerable versions of Snowblind Web Server face risks of data leakage, system compromise, and potential regulatory violations if sensitive information is exposed. The vulnerability represents a classic example of insufficient input validation and improper access control implementation, where the web server fails to enforce proper boundary checks on user-supplied path information.
Effective mitigation strategies for this vulnerability include immediate patching of the Snowblind Web Server to a version that properly validates and sanitizes input paths, implementing proper input validation mechanisms that reject or normalize directory traversal sequences, and configuring the web server to operate with minimal privileges and restricted directory access. Network-level protections such as web application firewalls and intrusion detection systems can provide additional defense layers, while regular security audits and code reviews should be implemented to prevent similar issues in custom web applications. The remediation process should also include comprehensive testing of path handling mechanisms and ensuring that all user-supplied input undergoes proper sanitization before being processed by the web server components.