CVE-2025-4109 Overview
CVE-2025-4109 is a SQL injection vulnerability in PHPGurukul Pre-School Enrollment System 1.0. The flaw resides in the /admin/edit-subadmin.php script, where the mobilenumber parameter is not properly sanitized before being used in a database query. An authenticated attacker with low privileges can inject arbitrary SQL syntax through this parameter to manipulate backend queries. The exploit has been publicly disclosed, increasing the risk of opportunistic abuse. Other parameters in the same file may also be susceptible to similar injection attacks. The vulnerability is classified under CWE-74 (Improper Neutralization of Special Elements in Output).
Critical Impact
Remote attackers can manipulate database queries through the mobilenumber parameter, potentially exposing administrative data, modifying records, or escalating access within the application.
Affected Products
- PHPGurukul Pre-School Enrollment System 1.0
- Component: /admin/edit-subadmin.php
- Vulnerable parameter: mobilenumber (additional parameters may also be affected)
Discovery Timeline
- 2025-04-30 - CVE-2025-4109 published to NVD
- 2025-05-13 - Last updated in NVD database
Technical Details for CVE-2025-4109
Vulnerability Analysis
The vulnerability stems from improper input neutralization in the administrative sub-admin editing workflow. When an administrator submits the edit form, the application passes the mobilenumber POST parameter directly into a SQL statement without parameterized queries or input filtering. This allows an attacker to break out of the original query context and append arbitrary SQL clauses.
Because /admin/edit-subadmin.php is part of the administrative interface, exploitation requires valid low-privilege credentials. However, the Pre-School Enrollment System ships with default administrative paths that are frequently exposed to the internet. Successful exploitation can yield credential extraction, unauthorized record modification, or full database disclosure depending on the underlying MySQL user privileges.
Root Cause
The root cause is the concatenation of untrusted user input into SQL statements, a classic violation of secure coding standards for database access. PHPGurukul's codebase does not apply prepared statements or input escaping for the mobilenumber field, leaving the query directly modifiable by attacker-controlled data.
Attack Vector
The attack is delivered over the network via HTTP requests to the admin interface. An authenticated attacker submits a crafted mobilenumber value containing SQL metacharacters. The injected payload alters the query logic, enabling techniques such as UNION-based extraction, boolean-based blind injection, or time-based inference. The public disclosure on GitHub provides technical details that lower the skill barrier for exploitation. See the GitHub Issue on CVE and VulDB Report #306589 for additional context.
Detection Methods for CVE-2025-4109
Indicators of Compromise
- HTTP POST requests to /admin/edit-subadmin.php containing SQL metacharacters such as single quotes, UNION, SELECT, --, or SLEEP( in the mobilenumber parameter.
- Unexpected database errors or response time delays correlating with requests to the edit-subadmin endpoint.
- Creation or modification of administrative accounts not initiated by authorized personnel.
Detection Strategies
- Deploy web application firewall (WAF) rules to flag SQL injection signatures targeting form parameters in PHPGurukul administrative scripts.
- Enable MySQL general query logging and inspect statements originating from the enrollment system for anomalous syntax patterns.
- Correlate authentication logs with admin endpoint access to identify abuse from compromised low-privilege accounts.
Monitoring Recommendations
- Monitor outbound database traffic for unusual volumes of SELECT operations against sensitive tables such as admin or tblsubadmin.
- Alert on repeated 500-series HTTP responses from /admin/edit-subadmin.php, which often indicate failed injection attempts.
- Review access logs for sub-admin sessions performing edits outside of normal business hours.
How to Mitigate CVE-2025-4109
Immediate Actions Required
- Restrict network access to the /admin/ directory using IP allowlisting or VPN-only access until a patch is available.
- Rotate credentials for all administrative and sub-admin accounts in the affected installation.
- Audit the tblsubadmin and related tables for unauthorized modifications.
Patch Information
No official vendor patch has been published at the time of writing. Refer to the PHP Gurukul Security Resource for vendor updates. Organizations should track the VulDB #306589 entry for remediation status.
Workarounds
- Apply virtual patching at the WAF layer to block SQL metacharacters in the mobilenumber and adjacent POST parameters on /admin/edit-subadmin.php.
- Modify the affected PHP source to use prepared statements with bound parameters via mysqli_prepare() or PDO instead of string concatenation.
- Enforce least-privilege on the database user account used by the application, removing DROP, ALTER, and FILE privileges.
# Example WAF rule (ModSecurity) to block SQLi patterns in mobilenumber
SecRule ARGS:mobilenumber "@rx (?i)(union(.*?)select|sleep\(|benchmark\(|--|;|/\*)" \
"id:1004109,phase:2,deny,status:403,msg:'CVE-2025-4109 SQLi attempt blocked'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
