CVE-2025-5373: PHPGurukul Birth Certificate SQL Injection

CVE-2025-5373 Overview

CVE-2025-5373 is a SQL injection vulnerability in PHPGurukul Online Birth Certificate System 2.0. The flaw resides in /admin/users-applications.php, where the userid parameter is passed to a database query without proper sanitization. An authenticated attacker with low privileges can manipulate this parameter to inject arbitrary SQL statements. The vulnerability is remotely exploitable over the network, and the exploit technique has been publicly disclosed. The issue is classified under [CWE-89] (SQL Injection) and [CWE-74] (Improper Neutralization of Special Elements in Output).

Critical Impact
Remote attackers can inject SQL through the userid parameter to read, modify, or delete data in the birth certificate application database.

Affected Products

PHPGurukul Online Birth Certificate System 2.0
Vulnerable component: /admin/users-applications.php
Vulnerable parameter: userid

Discovery Timeline

2025-05-31 - CVE-2025-5373 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-5373

Vulnerability Analysis

The vulnerability affects the administrative user applications management page in PHPGurukul Online Birth Certificate System 2.0. The userid argument supplied to /admin/users-applications.php is concatenated into a SQL query without parameterization or input validation. Attackers can supply crafted values to break out of the intended query context and execute arbitrary SQL statements against the backend database.

Exploitation requires network access to the admin interface and low-level authentication. Because the injection point sits within an administrative workflow, successful exploitation can expose applicant personal data, birth certificate records, and administrative account credentials stored in the database.

Root Cause

The root cause is direct interpolation of the userid request parameter into a SQL statement without prepared statements or type casting. PHP code handling the parameter fails to apply escaping functions or bind variables, allowing metacharacters such as single quotes and SQL keywords to alter query structure. This maps directly to [CWE-89] Improper Neutralization of Special Elements used in an SQL Command.

Attack Vector

The attack vector is network-based. An attacker sends an HTTP request to /admin/users-applications.php with a manipulated userid value containing SQL syntax such as UNION SELECT clauses or boolean-based payloads. No user interaction is required beyond submitting the crafted request. Public disclosure of the exploit lowers the barrier for opportunistic scanning and automated attacks against exposed installations. See the GitHub Issue #27 Discussion and VulDB entry #310666 for additional technical context.

Detection Methods for CVE-2025-5373

Indicators of Compromise

HTTP requests to /admin/users-applications.php containing SQL metacharacters such as ', --, UNION, SELECT, or SLEEP( in the userid parameter.
Web server access logs showing unusually long query strings or repeated requests with incrementing payloads targeting the userid parameter.
Database error messages returned in HTTP responses referencing MySQL syntax errors originating from the admin endpoint.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect and block SQL injection patterns targeting the userid parameter on the admin path.
Enable verbose query logging on the MySQL backend and alert on syntactically anomalous queries originating from the birth certificate application.
Correlate authentication events with subsequent parameter-tampering activity from the same session to identify low-privilege abuse.

Monitoring Recommendations

Monitor outbound traffic from the web server for signs of data exfiltration following admin panel activity.
Track failed login attempts against /admin/ endpoints and correlate with successful sessions that immediately access users-applications.php.
Baseline normal query patterns against the application database and alert on UNION, INFORMATION_SCHEMA, or SLEEP clauses that deviate from baseline.

How to Mitigate CVE-2025-5373

Immediate Actions Required

Restrict network access to the /admin/ directory using IP allowlists or VPN-only reachability until a vendor fix is applied.
Rotate credentials for all administrative accounts and any database users referenced by the application configuration.
Deploy WAF signatures that block SQL injection payloads targeting the userid parameter in /admin/users-applications.php.

Patch Information

At the time of publication, no official vendor patch is listed in the NVD advisory references or on the PHP Gurukul site. Administrators should monitor the vendor site for updates and apply any released patch immediately. Interim source-level fixes should replace direct string concatenation with parameterized queries using PDO prepared statements or mysqli_prepare with bound parameters.

Workarounds

Apply server-side input validation that rejects any non-numeric value submitted for the userid parameter before it reaches database code.
Configure the database account used by the application with least-privilege permissions, removing unnecessary FILE, DROP, or INFORMATION_SCHEMA access.
Disable or remove the /admin/users-applications.php endpoint if the functionality is not required for production operation.

bash

# Example nginx rule to block obvious SQLi patterns on the vulnerable endpoint
location /admin/users-applications.php {
    if ($arg_userid ~* "(union|select|sleep|--|';|/\*)") {
        return 403;
    }
    # allowlist numeric userid values only
    if ($arg_userid !~ "^[0-9]+$") {
        return 403;
    }
}