CVE-2019-25520: Jettweb PHP Authentication Bypass Flaw

CVE-2019-25520 Overview

CVE-2019-25520 is an authentication bypass vulnerability affecting Jettweb PHP Hazir Haber Sitesi Scripti V1, a PHP-based news website script. The vulnerability exists in the administration panel login functionality and allows unauthenticated attackers to gain administrative access by exploiting improper SQL query validation. Attackers can submit SQL injection payloads in the username and password fields of the admingiris.php login form to bypass authentication and access the administrative interface.

Critical Impact

Unauthenticated attackers can bypass authentication controls entirely and gain full administrative access to the web application, potentially leading to complete site compromise, data theft, or defacement.

Affected Products

• Jettweb PHP Hazir Haber Sitesi Scripti V1

Discovery Timeline

• 2026-03-12 - CVE CVE-2019-25520 published to NVD
• 2026-03-12 - Last updated in NVD database

Technical Details for CVE-2019-25520

Vulnerability Analysis

This vulnerability is classified as CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL Injection. The flaw resides in the authentication mechanism of the admingiris.php file, which handles administrator login requests. When processing login credentials, the application fails to properly sanitize user-supplied input before incorporating it into SQL queries.

The attack is network-accessible with low complexity, requiring no privileges or user interaction to exploit. A successful attack results in high confidentiality impact as attackers gain unauthorized access to protected administrative functions and potentially sensitive data stored in the backend database.

Root Cause

The root cause of this vulnerability is insufficient input validation and the absence of parameterized queries (prepared statements) in the authentication logic. The admingiris.php script directly concatenates user-supplied username and password values into SQL queries without proper sanitization or escaping. This allows attackers to inject malicious SQL syntax that alters the query's logic, enabling authentication bypass.

Attack Vector

The attack is executed over the network by targeting the administrator login page (admingiris.php). An attacker submits specially crafted SQL injection payloads in the username and password form fields. These payloads manipulate the SQL query logic to return a true condition regardless of actual credentials, effectively bypassing the authentication mechanism.

For example, a typical authentication bypass payload might use classic SQL injection techniques such as commenting out password validation or injecting always-true conditions. The lack of prepared statements means the application interprets the malicious input as part of the SQL command rather than as literal string data.

Technical details and exploitation techniques are documented in the Exploit-DB #46597 entry and the VulnCheck Advisory.

Detection Methods for CVE-2019-25520

Indicators of Compromise

• Unusual or suspicious login attempts to admingiris.php containing SQL metacharacters (single quotes, double dashes, OR statements)
• Successful administrative logins from unexpected IP addresses or geographic locations
• Authentication log entries showing SQL syntax patterns in username or password fields
• Unauthorized changes to website content, user accounts, or database records

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block SQL injection patterns in POST parameters targeting admingiris.php
• Implement intrusion detection system (IDS) signatures for common SQL injection authentication bypass patterns
• Monitor web server access logs for requests to admingiris.php with suspicious query strings or POST data
• Enable database query logging and alert on anomalous SQL statements during authentication events

Monitoring Recommendations

• Configure centralized logging for all authentication attempts to administrative panels
• Set up alerts for multiple failed login attempts followed by a successful login from the same source
• Monitor for unusual administrative session creation patterns or session anomalies
• Implement file integrity monitoring on critical website files to detect unauthorized modifications

How to Mitigate CVE-2019-25520

Immediate Actions Required

• Restrict access to admingiris.php and the administrative panel by IP address using web server configuration
• Implement a Web Application Firewall with SQL injection protection rules
• Consider taking the administrative panel offline until proper fixes can be applied
• Audit administrative accounts and session logs for signs of unauthorized access

Patch Information

No official vendor patch information is available for this vulnerability. Jettweb PHP Hazir Haber Sitesi Scripti V1 appears to be a legacy or unmaintained product. Organizations using this software should consider migrating to a modern, actively maintained content management system with proper security controls.

For additional technical information, refer to the Exploit-DB #46597 entry and the VulnCheck Advisory.

Workarounds

• Implement IP-based access restrictions to the administrative panel, limiting access to trusted networks only
• Deploy a Web Application Firewall configured to block SQL injection attempts
• Manually modify the admingiris.php source code to use prepared statements with parameterized queries for authentication
• Add additional authentication factors such as CAPTCHA or two-factor authentication to the login process
• Consider replacing the vulnerable script with a secure, actively maintained alternative

# Apache .htaccess configuration to restrict admin access by IP
<Files "admingiris.php">
    Order Deny,Allow
    Deny from all
    Allow from 192.168.1.0/24
    Allow from 10.0.0.0/8
</Files>