CVE-2025-62519

Executive Summary

CVE-2025-62519 is an authenticated SQL injection vulnerability in phpMyFAQ, an open-source FAQ web application. The flaw resides in the main configuration update functionality, allowing a privileged user with 'Configuration Edit' permissions to execute arbitrary SQL commands. Successful exploitation can lead to a full compromise of the database, including reading, modifying, or deleting all data, as well as potential remote code execution depending on the database configuration. The vulnerability is patched in version 4.0.14.

Supply Chain & Package Security

This vulnerability is not related to a package manager (NPM, PyPI, Go, Ruby) but is a direct application-level flaw in the phpMyFAQ source code. The application is typically deployed as a PHP web application, and the risk is associated with the application's own codebase, not a third-party dependency.

CVSS Breakdown & Threat Level

• CVSS Score: 7.2 (High)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: High (PR:H) - Requires 'Configuration Edit' permissions
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: High (C:H)
• Integrity Impact: High (I:H)
• Availability Impact: High (A:H)

The high privileges required reduce the overall score, but the impact is severe, potentially leading to full database compromise and remote code execution.

Deep Dive & Mechanics

The vulnerability is an authenticated SQL injection in the main configuration update functionality. The application fails to properly sanitize user-supplied input when updating configuration parameters. A privileged user with 'Configuration Edit' permissions can inject arbitrary SQL commands into the database query.

The injection likely occurs in a parameter that is directly concatenated into an SQL UPDATE or INSERT statement without proper parameterization or escaping. For example, a configuration value like site_name or meta_description might be vulnerable.

The attack flow:

1. Attacker authenticates as a user with 'Configuration Edit' permissions.
2. Attacker navigates to the configuration update page.
3. Attacker crafts a malicious payload in a configuration field, e.g., ' OR 1=1; -- -.
4. The application executes the SQL query with the injected payload.
5. The attacker can then extract, modify, or delete data, or potentially execute system commands via xp_cmdshell (if SQL Server) or INTO OUTFILE (if MySQL).

Vulnerable vs. Patched Code

Vulnerable Code (Conceptual):

// Vulnerable: Direct concatenation of user input
$sql = "UPDATE faqconfig SET config_value = '" . $_POST['config_value'] . "' WHERE config_name = '" . $_POST['config_name'] . "'";
$db->query($sql);

Patched Code (Conceptual):

// Patched: Use prepared statements
$stmt = $db->prepare("UPDATE faqconfig SET config_value = ? WHERE config_name = ?");
$stmt->bind_param("ss", $_POST['config_value'], $_POST['config_name']);
$stmt->execute();

The patched version uses prepared statements, which prevent SQL injection by separating SQL logic from data.

Exploitation & Lab Setup

Red Team

Prerequisites:

• Access to a phpMyFAQ instance (version < 4.0.14)
• Valid credentials with 'Configuration Edit' permissions

Exploitation Steps:

1. Authenticate to the phpMyFAQ admin panel.
2. Navigate to the configuration update page (e.g., /admin/index.php?action=config).
3. Identify a vulnerable configuration parameter (e.g., main.title).
4. Inject SQL payload into the parameter value.

Example Payload (MySQL):

' UNION SELECT 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