CVE-2001-0202 in PicServer
Summary
by MITRE
Picserver web server allows remote attackers to read arbitrary files via a .. (dot dot) attack in an HTTP GET request.
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Analysis
by VulDB Data Team • 03/15/2025
The vulnerability described in CVE-2001-0202 represents a classic directory traversal flaw in the Picserver web server implementation. This security weakness allows remote attackers to access files outside the intended web root directory by manipulating HTTP GET requests through the use of directory traversal sequences. The specific exploitation technique involves appending .. (dot dot) sequences to file paths in requests, enabling attackers to navigate upward through the directory structure and access sensitive system files that should remain protected from web access. This type of vulnerability falls under the category of path traversal attacks and is classified as CWE-22 according to the Common Weakness Enumeration framework.
The technical implementation of this vulnerability stems from inadequate input validation within the Picserver web server's file handling mechanisms. When processing HTTP GET requests, the server fails to properly sanitize or validate the requested file paths, allowing malicious users to inject traversal sequences that bypass normal access controls. The web server processes these malformed paths without proper boundary checking, resulting in the direct access to filesystem locations that should be restricted to authorized users only. This flaw demonstrates a fundamental lack of proper access control enforcement and input sanitization practices that are essential for secure web application development.
The operational impact of this vulnerability is significant as it provides attackers with unauthorized access to arbitrary files on the affected system. Depending on the system configuration and the privileges of the web server process, attackers may be able to read configuration files, source code, user credentials, database files, or other sensitive information that could lead to further compromise. The vulnerability enables attackers to escalate their privileges and potentially gain deeper access to the underlying system, making it a critical security concern for any environment where Picserver is deployed. This type of attack can result in data breaches, system compromise, and unauthorized access to confidential information.
Organizations affected by this vulnerability should immediately implement mitigations including updating to patched versions of the Picserver software, implementing proper input validation and sanitization measures, and configuring access controls to prevent directory traversal attacks. Network segmentation and firewall rules should be configured to restrict access to the web server, while web application firewalls can be deployed to detect and block malicious traversal attempts. Additionally, regular security audits and penetration testing should be conducted to identify similar vulnerabilities in other web applications and systems. The remediation process should also include comprehensive logging and monitoring to detect potential exploitation attempts and ensure proper incident response procedures are in place. This vulnerability serves as a reminder of the importance of following secure coding practices and implementing defense-in-depth strategies to protect against common attack vectors such as those categorized under the ATT&CK framework's privilege escalation and credential access techniques.