CVE-2009-3902 in httpd
Summary
by MITRE
Directory traversal vulnerability in Cherokee Web Server 0.5.4 and earlier for Windows allows remote attackers to read arbitrary files via a /\.. (slash backslash dot dot) in the URL.
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Analysis
by VulDB Data Team • 11/18/2025
The CVE-2009-3902 vulnerability represents a critical directory traversal flaw in the Cherokee Web Server version 0.5.4 and earlier on Windows platforms. This vulnerability stems from improper input validation within the web server's URL parsing mechanism, which fails to adequately sanitize path components that contain directory traversal sequences. The specific exploitation vector involves crafting URLs with the pattern /\.. where the backslash followed by dot-dot sequence attempts to navigate upward in the directory structure. This flaw allows remote attackers to bypass normal access controls and retrieve arbitrary files from the server's file system, potentially exposing sensitive data including configuration files, user credentials, and application source code.
The technical implementation of this vulnerability aligns with CWE-22, which catalogs improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal attacks. The flaw occurs at the application layer where the web server processes incoming HTTP requests without sufficient validation of the requested file paths. When the Cherokee server encounters a URL containing the /\.. sequence, it fails to properly normalize or sanitize the path before attempting to access the requested resource, enabling attackers to traverse beyond the intended document root directory. This behavior violates fundamental security principles of least privilege and proper input validation that are essential for preventing unauthorized access to system resources.
The operational impact of CVE-2009-3902 extends beyond simple information disclosure, as it provides attackers with the capability to access critical system files that may contain sensitive information such as database connection strings, application secrets, and administrative credentials. The vulnerability is particularly concerning for Windows environments where the web server may have access to a broader range of system resources compared to Unix-like systems. Attackers could potentially leverage this vulnerability to escalate their privileges, gain deeper system access, or extract data that could be used for further exploitation within the network. The remote nature of the attack means that an attacker does not require local system access or authentication to exploit this vulnerability, making it a significant threat to web server security.
Mitigation strategies for CVE-2009-3902 should focus on immediate patching of the Cherokee Web Server to versions that properly address the directory traversal vulnerability. Organizations should implement network-level controls such as web application firewalls that can detect and block suspicious path traversal patterns in HTTP requests. Additionally, proper input validation should be implemented at the application level to normalize and sanitize all file path requests before processing. The principle of least privilege should be enforced by configuring the web server to operate with minimal required permissions and to restrict access to sensitive directories. Security monitoring should include detection of unusual file access patterns and attempts to traverse directory structures that could indicate exploitation attempts. This vulnerability demonstrates the importance of adhering to security best practices including regular software updates, input validation, and proper access control mechanisms as outlined in various security frameworks and standards including those referenced in the ATT&CK framework under the technique of privilege escalation through path traversal attacks.