CVE-2025-5657: PHPGurukul Complaint System SQLi Flaw

CVE-2025-5657 Overview

CVE-2025-5657 is a SQL injection vulnerability in PHPGurukul Complaint Management System 2.0. The flaw resides in /admin/manage-users.php, where the uid parameter is incorporated into a database query without proper sanitization. Authenticated attackers can manipulate this parameter to alter the underlying SQL statement and access or modify backend data. The vulnerability is remotely exploitable over the network and has been publicly disclosed, increasing the likelihood of opportunistic exploitation against exposed deployments.

Critical Impact

Remote attackers with low privileges can inject arbitrary SQL through the uid parameter, leading to unauthorized data access, modification, and potential takeover of the administrative interface.

Affected Products

• PHPGurukul Complaint Management System 2.0
• Deployments exposing /admin/manage-users.php to untrusted networks
• Installations relying on default PHPGurukul query construction patterns

Discovery Timeline

• 2025-06-05 - CVE-2025-5657 published to the National Vulnerability Database
• 2025-06-10 - Last updated in NVD database

Technical Details for CVE-2025-5657

Vulnerability Analysis

The vulnerability is classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component). The administrative endpoint /admin/manage-users.php accepts the uid request parameter and concatenates it directly into a SQL statement executed against the application's database. Because the input is neither parameterized nor escaped, attackers can append SQL syntax that the database engine interprets as part of the original query.

Successful exploitation requires authenticated access to the administrative area, which lowers but does not eliminate risk. Many PHPGurukul deployments retain default credentials or expose the admin panel on the public internet, conditions that frequently enable initial access.

Root Cause

The root cause is the absence of prepared statements or input validation when handling the uid parameter. The application trusts user-supplied input as a numeric identifier and inserts it into a query string without binding it as a parameter. This pattern is consistent across multiple PHPGurukul applications and has produced repeated SQL injection findings in public vulnerability databases.

Attack Vector

An attacker reaches the vulnerable endpoint through standard HTTP requests after authenticating to the admin console. The attacker supplies a crafted uid value containing SQL metacharacters such as single quotes, UNION clauses, or boolean expressions. The injected payload executes within the database session, allowing extraction of arbitrary records, modification of user accounts, or escalation to broader administrative actions. Technical exploitation notes are published in the GitHub Issue Discussion and VulDB CTI ID #311147.

The vulnerability manifests in the database query construction logic of manage-users.php. No verified proof-of-concept code is referenced beyond the public disclosure write-ups linked in the external references.

Detection Methods for CVE-2025-5657

Indicators of Compromise

• HTTP requests to /admin/manage-users.php containing SQL metacharacters in the uid parameter, including ', --, UNION, SELECT, or OR 1=1
• Web server access logs showing unusually long uid values or URL-encoded SQL fragments such as %27 and %20UNION%20
• Database error messages referencing manage-users.php in application or PHP error logs
• Unexpected administrative user creations, deletions, or privilege changes in the application database

Detection Strategies

• Deploy web application firewall rules that inspect query parameters on /admin/*.php endpoints for SQL injection signatures
• Enable database query logging and alert on queries originating from the application user that contain unusual UNION or comment sequences
• Correlate authentication events with administrative actions to surface session abuse following injection attempts

Monitoring Recommendations

• Monitor web server logs for repeated 500-series responses from /admin/manage-users.php, which often indicate injection probing
• Track outbound database connections from the PHP application host for volume anomalies that suggest data exfiltration
• Review administrative panel access by source IP and flag connections from networks that should not reach the management interface

How to Mitigate CVE-2025-5657

Immediate Actions Required

• Restrict network access to /admin/manage-users.php and the broader admin interface using IP allowlists or VPN-only access
• Rotate administrative credentials and enforce strong password policies on all PHPGurukul accounts
• Audit the application database for unauthorized user records or modified privilege fields
• Deploy a web application firewall with SQL injection signatures applied to the PHPGurukul application path

Patch Information

No vendor patch has been published for CVE-2025-5657 at the time of writing. Refer to the PHP Gurukul Resource for any future updates. Operators should evaluate whether continued use of PHPGurukul Complaint Management System 2.0 is appropriate given the absence of a fix and the public disclosure tracked in VulDB #311147.

Workarounds

• Modify manage-users.php to use PDO or MySQLi prepared statements with bound parameters instead of string concatenation
• Cast the uid value to an integer using intval() before inserting it into any query as a temporary hardening measure
• Disable the affected administrative function if it is not required for business operations
• Place the application behind authenticated reverse proxy controls to limit pre-authentication exposure

# Example ModSecurity rule to block SQLi patterns targeting the uid parameter
SecRule REQUEST_URI "@beginsWith /admin/manage-users.php" \
  "chain,deny,status:403,id:1005657,msg:'Possible SQLi against PHPGurukul uid parameter'"
  SecRule ARGS:uid "@rx (?i)(union(\s|/\*).*select|or\s+1=1|--|;|')" "t:none,t:urlDecodeUni"