CVE-2002-1133 in Dinos Webserver
Summary
by MITRE
Encoded directory traversal vulnerability in Dino s web server 2.1 allows remote attackers to read arbitrary files via ".." (dot dot) sequences with URL-encoded (1) "/" (%2f") or (2) "\" (%5c) characters.
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Analysis
by VulDB Data Team • 09/08/2025
The vulnerability described in CVE-2002-1133 represents a critical directory traversal flaw within Dino s web server version 2.1 that enables remote attackers to access arbitrary files on the affected system. This issue stems from insufficient input validation and improper handling of URL-encoded sequences that are commonly used to navigate directory structures. The vulnerability specifically targets the server's interpretation of directory traversal attempts using encoded characters such as forward slashes %2f and backslashes %5c, which when combined with the standard dot dot sequences .. can manipulate the server's file access mechanisms. The flaw exists at the application layer where the web server fails to properly sanitize or normalize URL parameters before processing file access requests, creating a path traversal condition that bypasses normal security boundaries.
This vulnerability operates under the Common Weakness Enumeration category CWE-22, which defines improper limitation of a pathname to a restricted directory, commonly known as directory traversal or path traversal attacks. The attack vector leverages the fact that web servers often interpret URL-encoded characters in ways that can be exploited to manipulate file system access paths. When an attacker submits a request containing encoded dot dot sequences followed by %2f or %5c characters, the web server processes these inputs without adequate validation, allowing access to files outside the intended web root directory. The exploitation mechanism specifically targets the server's internal path resolution logic, where URL decoding occurs before file access validation, creating a window where malicious path manipulation can succeed.
The operational impact of this vulnerability is severe and potentially catastrophic for systems running the affected web server version. Remote attackers can leverage this flaw to access sensitive files including configuration files, database files, system logs, and potentially even system binaries or credentials stored on the server. The vulnerability can be exploited without authentication, making it particularly dangerous as it allows unauthorized access to potentially critical system information. Depending on the server configuration and file permissions, attackers might gain access to source code files, user databases, administrative credentials, or other confidential information that could lead to further compromise of the system. The vulnerability essentially provides an attacker with a backdoor mechanism to explore the file system structure and extract arbitrary data, potentially leading to complete system compromise.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term security improvements. The most effective immediate solution involves applying the vendor-supplied patch or upgrading to a newer version of Dino s web server that properly handles URL-encoded directory traversal sequences. Organizations should implement input validation mechanisms that normalize and sanitize all URL parameters before they are processed by the file system access routines. This includes implementing proper path normalization that decodes and validates all path components, rejecting requests containing encoded traversal sequences, and enforcing strict file access controls that limit the server's ability to access arbitrary file paths. Additionally, implementing web application firewalls and intrusion detection systems can help detect and block suspicious traversal attempts. The solution aligns with ATT&CK technique T1083 which involves discovering file and directory permissions, and T1566 which covers credential access through various means including file system exploitation. Security teams should also conduct comprehensive security assessments to identify other potential path traversal vulnerabilities in their web applications and ensure that all file access operations properly validate and sanitize input parameters.