CVE-2025-45240

Executive Summary

CVE-2025-45240 identifies a critical SQL injection vulnerability in FoxCMS version 1.2.5. The flaw resides in the executeCommand method within DataBackup.php, allowing an unauthenticated attacker to inject arbitrary SQL commands. This can lead to unauthorized data access, modification, or deletion of the underlying database. No public proof-of-concept (PoC) or exploit code has been released, and no official patch is available. The vulnerability is classified under MITRE ATT&CK tactic T1190 (Exploit Public-Facing Application) and CWE-89 (SQL Injection). Given the lack of a patch, immediate mitigation measures are essential.

Supply Chain & Package Security

FoxCMS is a PHP-based content management system. This vulnerability is not related to any package manager (NPM, PyPI, Go, Ruby) but is a direct application-level flaw. Users should verify the integrity of their FoxCMS installation and consider replacing it with a supported alternative.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, likely due to incomplete NVD data. Based on the vulnerability type (SQL injection in a public-facing method), a realistic CVSS v3.1 vector would be:

• Attack Vector (AV): Network (N)
• Attack Complexity (AC): Low (L)
• Privileges Required (PR): None (N)
• User Interaction (UI): None (N)
• Scope (S): Unchanged (U)
• Confidentiality (C): High (H)
• Integrity (I): High (H)
• Availability (A): High (H)

Estimated CVSS Score: 9.8 (Critical)

Threat Level: Critical. The vulnerability is remotely exploitable without authentication, and successful exploitation can lead to full database compromise.

Deep Dive & Mechanics

The vulnerability exists in the executeCommand method of DataBackup.php. This method is designed to execute database backup commands but fails to sanitize user-supplied input. An attacker can craft a malicious HTTP request to the endpoint that calls executeCommand, injecting SQL statements into the command parameter.

Root Cause: Lack of input validation and parameterized queries. The method likely concatenates user input directly into a SQL query string.

Attack Vector: HTTP POST/GET request to the vulnerable endpoint with a crafted command parameter.

Impact:

• Unauthorized retrieval of sensitive data (user credentials, personal information).
• Modification or deletion of database records.
• Potential escalation to remote code execution if the database user has file write privileges.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical comparison based on common SQL injection fixes.

Vulnerable Code (DataBackup.php):

public function executeCommand($command) {
    $sql = "SELECT * FROM backups WHERE command = '" . $command . "'";
    $result = mysqli_query($this->db, $sql);
    // ...
}

Patched Code (Hypothetical):

public function executeCommand($command) {
    $stmt = $this->db->prepare("SELECT * FROM backups WHERE command = ?");
    $stmt->bind_param("s", $command);
    $stmt->execute();
    $result = $stmt->get_result();
    // ...
}

The patched version uses prepared statements to prevent SQL injection.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• FoxCMS v1.2.5 running on a target server.
• Network access to the vulnerable endpoint (e.g., /DataBackup.php).

Exploitation Steps:

1. Identify the vulnerable endpoint: http://target.com/DataBackup.php?action=executeCommand.
2. Craft a malicious command parameter to extract data. Example:

   command=1' UNION SELECT username,password FROM users --
   

3. Send the request using curl:

   curl "http://target.com/DataBackup.php?action=executeCommand&command=1'%20UNION%20SELECT%20username,password%20FROM%20users%20--"
   

4. Parse the response for extracted data.

Note: No public exploit code is available; this is a conceptual example.

Blue Team (Defense)

Detection:

• Monitor for unusual SQL error messages in logs.
• Deploy a Web Application Firewall (WAF) with SQL injection signatures.
• Use the detection rules provided below.

Mitigation:

• Immediately restrict access to DataBackup.php via .htaccess or firewall rules.
• Disable the executeCommand method if not required.
• Apply input validation and parameterized queries as a permanent fix.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP requests to /DataBackup.php with parameters containing SQL keywords (e.g., UNION, SELECT, --).
  • Unusual database error messages in HTTP responses (e.g., "You have an error in your SQL syntax").

• File IOCs:

  • Modified DataBackup.php file (if attacker attempts to patch).
  • Suspicious entries in database backup logs.

• System IOCs:

  • Unexpected database queries from the web server user.
  • New user accounts or modified data in the CMS database.

Detection Engineering

YARA Rule

rule CVE_2025_45240_SQLi_DataBackup {
    meta:
        description = "Detects SQL injection attempts targeting FoxCMS DataBackup.php"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-45240"
    strings:
        $s1 = "DataBackup.php" nocase
        $s2 = "executeCommand" nocase
        $s3 = "UNION" nocase
        $s4 = "SELECT" nocase
        $s5 = "DROP" nocase
        $s6 = "INSERT" nocase
    condition:
        $s1 and $s2 and (any of ($s3, $s4, $s5, $s6))
}

Sigma Rule

title: FoxCMS DataBackup.php SQL Injection Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects SQL injection attempts targeting the executeCommand method in FoxCMS DataBackup.php
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains:
            - "DataBackup.php"
            - "executeCommand"
        cs-uri-query|contains|all:
            - "UNION"
            - "SELECT"
    condition: selection
falsepositives:
    - Legitimate backup commands containing similar strings (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-45240 FoxCMS SQL Injection Attempt"; flow:to_server,established; content:"DataBackup.php"; http_uri; content:"executeCommand"; http_uri; pcre:"/(UNION|SELECT|DROP|INSERT)/i"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the vulnerable endpoint: Block access to DataBackup.php via web server configuration (e.g., .htaccess for Apache):

   <Files "DataBackup.php">
       Require all denied
   </Files>
   

2. Apply input validation: If you must use the method, sanitize the command parameter by allowing only alphanumeric characters and specific safe commands.
3. Upgrade: Since no patch exists, consider migrating to a supported CMS or applying a custom patch using prepared statements.

Long-term Recommendations:

• Conduct a full security audit of FoxCMS v1.2.5.
• Implement a Web Application Firewall (WAF) with SQL injection prevention.
• Follow secure coding practices, including parameterized queries and least privilege for database users.

Valters IT Signature This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.