CVE-2000-0004 in ZBServer
Summary
by MITRE
ZBServer Pro allows remote attackers to read source code for executable files by inserting a . (dot) into the URL.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability described in CVE-2000-0004 affects ZBServer Pro, a web server implementation that exhibits a critical directory traversal flaw in its handling of Uniform Resource Locators. This weakness enables remote attackers to access sensitive source code files by manipulating URL parameters through the insertion of a dot character. The vulnerability represents a classic path traversal attack vector that exploits insufficient input validation and improper access controls within the web server's file resolution mechanism.
This security flaw operates through the manipulation of URL paths where the dot character serves as a traversal indicator that allows attackers to move up directory levels in the file system hierarchy. When a dot is inserted into the URL, it can be interpreted by the web server as a command to navigate to parent directories, potentially enabling access to executable files and their source code that should remain protected within the server's file structure. The vulnerability specifically targets the server's inability to properly sanitize and validate incoming URL parameters before processing file requests.
The operational impact of this vulnerability is significant as it allows unauthorized remote access to source code files that may contain sensitive information such as database connection strings, authentication credentials, application logic, and other proprietary code elements. Attackers can leverage this weakness to gain insights into the application's architecture and potentially identify additional vulnerabilities within the system. The vulnerability affects the confidentiality and integrity of the web server's file system, as it allows for unauthorized reading of files that should be restricted to authorized personnel only.
From a cybersecurity perspective, this vulnerability aligns with CWE-22, which describes improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal. The issue also relates to ATT&CK technique T1566, which covers the exploitation of vulnerabilities in web applications to gain unauthorized access to system resources. The vulnerability demonstrates a fundamental flaw in input validation and access control mechanisms that should prevent unauthorized file system access. Organizations should implement proper input sanitization, restrict file access permissions, and deploy web application firewalls to mitigate such path traversal attacks. The vulnerability underscores the importance of maintaining proper file system access controls and validating all user-supplied input to prevent malicious navigation through the server's file structure.