CVE-2004-1801 in Web Server
Summary
by MITRE
Directory traversal vulnerability in PWebServer 0.3.3 allows remote attackers to read arbitrary files via a .. (dot dot) in the URL.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 12/30/2024
The directory traversal vulnerability in PWebServer 0.3.3 represents a critical security flaw that enables remote attackers to access arbitrary files on the target system through manipulated URL requests. This vulnerability stems from insufficient input validation within the web server's path handling mechanism, allowing malicious users to navigate beyond the intended document root directory. The issue manifests when the server fails to properly sanitize or normalize URL paths containing directory traversal sequences such as .. or %2e%2e, which are standard encoded representations of directory traversal components. The vulnerability is classified under CWE-22 as "Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')" and aligns with ATT&CK technique T1213.002 for data from local system repositories.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing directory traversal sequences that bypass the web server's intended file access restrictions. In PWebServer 0.3.3, the server processes these malformed paths without adequate validation, allowing the attacker to access files outside the web root directory. This could potentially expose sensitive system files, configuration data, or user information that should remain protected. The vulnerability is particularly dangerous because it requires no authentication and can be exploited through simple HTTP requests, making it highly accessible to attackers. The impact extends to potential information disclosure, system compromise, and unauthorized access to critical resources that should be restricted to legitimate users only.
The operational impact of this vulnerability is significant for any organization utilizing PWebServer 0.3.3, as it provides attackers with unrestricted access to the underlying file system. Successful exploitation could lead to complete system compromise, data theft, or the ability to execute malicious code on the target server. Attackers might leverage this vulnerability to access database files, application configuration files, user credentials, or system logs that contain sensitive information. The vulnerability also creates opportunities for attackers to escalate privileges or establish persistent access through the compromise of system files or configuration settings. Organizations running this web server version face immediate security risks and should consider the potential for further exploitation through chained attacks that could leverage the initial directory traversal access to gain broader system control.
Mitigation strategies for this vulnerability include immediate patching or upgrading to a newer version of PWebServer that properly implements input validation and path normalization. Administrators should implement proper URL sanitization and path validation mechanisms that reject or normalize directory traversal sequences before processing file requests. Network-level protections such as web application firewalls can help detect and block malicious requests containing directory traversal patterns. Additionally, implementing proper access controls and restricting file system permissions can limit the damage if exploitation occurs. Organizations should also conduct thorough security audits of their web server configurations and ensure that all components are regularly updated to address known vulnerabilities. The remediation process should include disabling unnecessary file access capabilities and implementing proper logging to detect suspicious file access patterns that may indicate exploitation attempts.