CVE-2018-25184: Surreal ToDo Path Traversal Vulnerability

CVE-2018-25184 Overview

CVE-2018-25184 is a Local File Inclusion (LFI) vulnerability affecting Surreal ToDo version 0.6.1.2. This vulnerability allows unauthenticated attackers to read arbitrary files on the target system by manipulating the content parameter in index.php. Through the use of directory traversal sequences, attackers can bypass intended access restrictions and access sensitive system files, including configuration files and initialization scripts.

Critical Impact

Unauthenticated attackers can exploit directory traversal sequences to access sensitive configuration files and system data without any authentication, potentially exposing credentials and application secrets.

Affected Products

• Surreal ToDo version 0.6.1.2

Discovery Timeline

• 2026-03-06 - CVE-2018-25184 published to NVD
• 2026-03-09 - Last updated in NVD database

Technical Details for CVE-2018-25184

Vulnerability Analysis

This Local File Inclusion vulnerability exists due to improper input validation in the content parameter handling within index.php. The application fails to properly sanitize user-supplied input before using it to include or read files from the local file system. This oversight enables attackers to craft malicious requests containing path traversal sequences such as ../ to escape the intended directory context and access files elsewhere on the system.

The vulnerability is classified under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), which represents a fundamental failure in path canonicalization and input validation. Since no authentication is required to exploit this vulnerability, any attacker with network access to the application can leverage it to exfiltrate sensitive data.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and sanitization of the content parameter in index.php. The application directly uses user-supplied input to construct file paths without filtering dangerous characters or validating that the resulting path remains within the intended directory structure. This allows directory traversal sequences to be processed, enabling attackers to navigate the file system hierarchy and access files outside the web application's root directory.

Attack Vector

The attack vector for CVE-2018-25184 is local, requiring the attacker to have access to the system where Surreal ToDo is installed. The exploitation mechanism involves sending crafted HTTP requests to index.php with malicious content parameter values containing directory traversal sequences (e.g., ../../../etc/passwd). When the server processes these requests, it follows the traversal path and includes or returns the contents of the specified file, effectively disclosing sensitive information to the attacker.

For detailed technical information and proof-of-concept examples, refer to the Exploit-DB #45826 advisory.

Detection Methods for CVE-2018-25184

Indicators of Compromise

• HTTP requests to index.php containing the content parameter with ../ sequences or URL-encoded variants (%2e%2e%2f)
• Access logs showing requests attempting to access system files like /etc/passwd, /etc/shadow, or application configuration files
• Unusual file access patterns in web server logs indicating traversal attempts to parent directories

Detection Strategies

• Configure web application firewalls (WAF) to detect and block requests containing directory traversal patterns such as ../, ..\, and their URL-encoded equivalents
• Implement intrusion detection rules to flag HTTP requests with path traversal sequences targeting the content parameter
• Monitor application logs for anomalous file access attempts that reference paths outside the web root directory

Monitoring Recommendations

• Enable verbose logging on web servers to capture full request parameters, particularly for requests to index.php
• Set up alerts for any requests containing common traversal patterns or attempts to access sensitive system files
• Regularly audit access logs for patterns indicative of LFI exploitation attempts

How to Mitigate CVE-2018-25184

Immediate Actions Required

• Restrict network access to Surreal ToDo installations to trusted users and networks only
• Implement web application firewall rules to block requests containing directory traversal sequences
• Consider disabling or removing the affected application if it is not essential until a patch is available
• Review system logs for evidence of prior exploitation attempts

Patch Information

No official vendor patch information is currently available for this vulnerability. Users should monitor the VulnCheck Security Advisory for updates regarding remediation guidance.

Workarounds

• Deploy a web application firewall (WAF) configured to filter and block directory traversal patterns in HTTP requests
• Restrict file system permissions to limit the web server's access to only necessary directories and files
• Implement input validation at the application or proxy layer to reject requests containing path traversal characters
• Isolate the application in a containerized environment with minimal file system access to reduce the impact of potential exploitation

# Example: Apache mod_rewrite rule to block directory traversal attempts
RewriteEngine On
RewriteCond %{QUERY_STRING} (\.\./|\.\.\\) [NC,OR]
RewriteCond %{QUERY_STRING} (%2e%2e%2f|%2e%2e/|\.%2e/|%2e\./|\.\.%5c|%2e%2e\\) [NC]
RewriteRule .* - [F,L]