CVE-2002-1986 in LiteServe
Summary
by MITRE
Perception LiteServe 2.0 through 2.0.1 allows remote attackers to obtain the source code of CGI scripts via an HTTP request with a trailing dot (".").
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Analysis
by VulDB Data Team • 08/31/2025
The vulnerability identified as CVE-2002-1986 affects Perception LiteServe web server versions 2.0 through 2.0.1, representing a critical security flaw in web application handling of file requests. This issue stems from improper input validation and path resolution mechanisms within the server implementation, creating a pathway for remote attackers to access sensitive server-side script files. The vulnerability specifically exploits how the web server processes HTTP requests containing trailing dots in the requested file paths, allowing unauthorized access to the underlying source code of CGI scripts that should remain protected from public viewing.
The technical exploitation occurs through a carefully crafted HTTP request that includes a trailing dot character in the requested URI. When the Perception LiteServe server processes this malformed request, it fails to properly sanitize or validate the path components, leading to directory traversal behavior that bypasses normal access controls. This flaw falls under the CWE-22 category of Improper Limitation of a Pathname to a Restricted Directory, commonly known as path traversal or directory traversal vulnerabilities. The server's inadequate handling of the trailing dot character causes it to resolve the request to the actual file location, exposing the source code of CGI scripts that contain sensitive business logic, database connection details, or authentication mechanisms.
The operational impact of this vulnerability is significant as it allows attackers to obtain the source code of CGI scripts, which typically contain proprietary business logic, database credentials, and application-specific configurations. This exposure can lead to comprehensive understanding of the web application architecture, identification of additional vulnerabilities, and potential exploitation of other security weaknesses present in the application code. The vulnerability enables attackers to perform reconnaissance activities that would normally require direct system access or more sophisticated exploitation techniques, making it particularly dangerous for web applications that rely on server-side scripting for core functionality. The attack vector requires only a basic HTTP request to be executed against the vulnerable server, making it easily exploitable from any remote location without requiring authentication or special privileges.
The security implications extend beyond simple source code disclosure, as CGI scripts often contain sensitive information such as database connection strings, API keys, or application configuration parameters that could be leveraged for further attacks. This vulnerability demonstrates a fundamental flaw in input validation and path resolution that could potentially be exploited to access other sensitive files on the server, depending on the server configuration and file permissions. Organizations running affected versions of Perception LiteServe should implement immediate mitigations including upgrading to patched versions, implementing proper input validation at the server level, and configuring access controls to prevent unauthorized file access. The vulnerability also highlights the importance of proper security testing and code review practices that should identify such path traversal issues during development and deployment phases. According to ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and T1566 (Phishing with Malicious Attachments) as attackers can use the disclosed source code to craft more sophisticated attacks or to identify additional attack vectors within the application infrastructure.
Organizations should prioritize patching affected systems as the primary mitigation strategy, as Perception LiteServe versions beyond 2.0.1 have addressed this vulnerability through proper input validation and path resolution mechanisms. Additional defensive measures include implementing web application firewalls that can detect and block suspicious path traversal patterns, configuring proper access controls and file permissions, and conducting regular security assessments to identify similar vulnerabilities in other web applications. The vulnerability serves as a reminder of the critical importance of input validation in web server implementations and the potential consequences of inadequate security controls in server-side applications.