CVE-2019-25352 Overview
CVE-2019-25352 is a directory traversal vulnerability affecting Crystal Live HTTP Server version 6.01. This vulnerability allows remote attackers to access sensitive system files by manipulating URL path segments. Attackers can leverage multiple ../ sequences to navigate outside the web root directory and retrieve sensitive configuration files, including Windows system files.
Critical Impact
Remote unauthenticated attackers can read arbitrary files on the server, potentially exposing sensitive configuration data, credentials, and system information without any user interaction required.
Affected Products
- Crystal Live HTTP Server 6.01
Discovery Timeline
- 2026-02-18 - CVE-2019-25352 published to NVD
- 2026-02-19 - Last updated in NVD database
Technical Details for CVE-2019-25352
Vulnerability Analysis
This vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), commonly known as Path Traversal or Directory Traversal. The Crystal Live HTTP Server fails to properly sanitize user-supplied input in URL path segments before processing file requests.
When a web server receives a request for a file, it should restrict access to files within the designated web root directory. However, Crystal Live HTTP Server 6.01 does not adequately filter or validate path traversal sequences such as ../ (dot-dot-slash). This allows attackers to escape the web root and access files anywhere on the file system that the web server process has permissions to read.
The network-accessible nature of the vulnerability means any attacker who can reach the HTTP server over the network can exploit this flaw without authentication or user interaction.
Root Cause
The root cause of this vulnerability lies in insufficient input validation and path canonicalization in the HTTP request handler. The server fails to properly sanitize or reject requests containing directory traversal sequences before resolving the requested file path. When processing incoming HTTP GET requests, the application concatenates user-controlled path segments directly with the web root directory without adequately normalizing or validating the resulting path.
Attack Vector
The attack vector is network-based and requires no authentication or special privileges. An attacker can craft malicious HTTP requests containing sequences of ../ to traverse up the directory structure from the web root. By including enough parent directory references, the attacker can navigate to any location on the file system and request sensitive files.
For example, an attacker targeting a Windows-based installation could request paths like /../../../windows/system.ini to read Windows configuration files. The server, failing to validate the path, would resolve this to an absolute path outside the intended web root and return the file contents to the attacker.
Technical details and proof-of-concept information are available in the Exploit-DB #47666 entry and the VulnCheck Security Advisory.
Detection Methods for CVE-2019-25352
Indicators of Compromise
- HTTP access logs containing requests with multiple ../ or URL-encoded variants (%2e%2e%2f, %2e%2e/) in the path
- Requests targeting common sensitive files such as /etc/passwd, win.ini, system.ini, or configuration files
- Unusual file access patterns from the web server process to directories outside the web root
- Network traffic showing HTTP responses containing system file contents
Detection Strategies
- Implement web application firewall (WAF) rules to detect and block requests containing path traversal patterns
- Configure intrusion detection systems (IDS) to alert on HTTP requests with multiple consecutive ../ sequences
- Enable verbose logging on the web server and monitor for requests with suspicious path patterns
- Deploy file integrity monitoring on sensitive system files to detect unauthorized read attempts
Monitoring Recommendations
- Regularly review HTTP access logs for anomalous path traversal attempts
- Monitor network traffic for HTTP requests targeting known sensitive file paths
- Set up alerting for any web server process accessing files outside the designated web root
- Implement behavioral analysis to detect unusual request patterns targeting the affected server
How to Mitigate CVE-2019-25352
Immediate Actions Required
- Discontinue use of Crystal Live HTTP Server 6.01 in production environments if possible
- Implement network-level access controls to restrict who can reach the vulnerable server
- Deploy a web application firewall configured to block path traversal attempts
- Monitor systems for signs of exploitation while planning remediation
Patch Information
No vendor patch information is currently available in the CVE data. Organizations should consult the Genivia Home Page for any updated versions or security advisories. Additional context may be available in the Crystal Quality Introduction archived page.
Workarounds
- Place the HTTP server behind a reverse proxy that sanitizes and validates all incoming paths before forwarding requests
- Implement strict input validation at the network perimeter to reject requests containing path traversal sequences
- Restrict file system permissions for the web server process to limit accessible files
- Consider migrating to an actively maintained HTTP server solution with proper security controls
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
