CVE-2001-0228 in Webserver
Summary
by MITRE
Directory traversal vulnerability in GoAhead web server 2.1 and earlier allows remote attackers to read arbitrary files via a .. attack in an HTTP GET request.
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Analysis
by VulDB Data Team • 03/10/2025
The CVE-2001-0228 vulnerability represents a critical directory traversal flaw in the GoAhead web server version 2.1 and earlier, fundamentally compromising the security boundaries of web applications. This vulnerability operates through a simple yet devastating mechanism where attackers can manipulate HTTP GET requests to navigate through the file system hierarchy using the .. (dot-dot) notation. The flaw exists in the web server's path resolution logic, which fails to properly validate or sanitize user-supplied input before processing file requests. When a malicious user submits a request containing directory traversal sequences, the server processes these requests without adequate boundary checks, allowing access to files outside the intended web root directory. This vulnerability directly violates fundamental security principles of web application isolation and access control, enabling unauthorized data access that can range from configuration files to system binaries and sensitive user data.
The technical exploitation of this vulnerability aligns with CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw demonstrates how inadequate input validation and sanitization can lead to severe privilege escalation scenarios within web server environments. Attackers can leverage this vulnerability to access critical system files such as password files, configuration databases, and application source code, potentially leading to complete system compromise. The vulnerability operates at the application layer and can be exploited through standard HTTP protocols without requiring special privileges or authentication. The impact extends beyond simple file access, as successful exploitation can provide attackers with information disclosure, potentially leading to further exploitation opportunities including credential theft, service disruption, and lateral movement within network environments.
From an operational perspective, this vulnerability presents a significant risk to organizations relying on GoAhead web servers for hosting web applications or serving content. The exploitability of CVE-2001-0228 is particularly concerning because it requires minimal technical sophistication to execute, making it a popular target for both automated scanning tools and malicious actors seeking to gain unauthorized access to web server resources. The vulnerability's presence in web server versions dating back to 2001 indicates a long-standing security gap that organizations may have overlooked, particularly in legacy systems or embedded environments where upgrading software versions may be challenging. Network security monitoring should specifically look for patterns of directory traversal attempts, which can be detected through intrusion detection systems and web application firewalls configured to recognize suspicious path sequences.
Organizations should implement immediate mitigations including upgrading to GoAhead web server versions that have patched this vulnerability, typically versions 2.2 and later. The patch addresses the core issue by implementing proper input validation and path normalization routines that prevent traversal sequences from escaping the designated web root directory. Additionally, organizations should deploy web application firewalls and intrusion prevention systems configured to block requests containing directory traversal patterns, such as double dots or encoded path sequences. Network segmentation and access controls should be enforced to limit exposure of vulnerable web servers to untrusted networks. Security teams should also conduct comprehensive audits of their web server configurations to identify any other potential path traversal vulnerabilities in custom applications or third-party components that may be using similar flawed path resolution logic. The vulnerability serves as a reminder of the critical importance of input validation and proper access control mechanisms in web application security, aligning with ATT&CK technique T1083 for discovering files and directories, and T1071.1001 for application layer protocols involving web services.