CVE-2025-9643: Apartment Management System SQLi Flaw

CVE-2025-9643 Overview

CVE-2025-9643 is a SQL injection vulnerability in itsourcecode Apartment Management System 1.0. The flaw resides in the /setting/utility_bill_setup.php script, where the txtGasBill parameter is passed to a backend SQL query without proper sanitization. Attackers can manipulate the parameter remotely to inject arbitrary SQL statements. The exploit details have been published, increasing the risk of opportunistic abuse against exposed instances. The vulnerability is tracked under [CWE-74] (Improper Neutralization of Special Elements in Output).

Critical Impact
Remote, unauthenticated attackers can inject SQL through the txtGasBill parameter to read, modify, or destroy data managed by the Apartment Management System database.

Affected Products

itsourcecode Apartment Management System 1.0
Admerc Apartment Management System (CPE: cpe:2.3:a:admerc:apartment_management_system:1.0)
Deployments exposing /setting/utility_bill_setup.php

Discovery Timeline

2025-08-29 - CVE-2025-9643 published to NVD
2026-04-29 - Last updated in NVD database

Technical Details for CVE-2025-9643

Vulnerability Analysis

The vulnerability stems from unsanitized handling of user-controlled input in the utility bill setup workflow. The txtGasBill form parameter flows directly into a SQL query executed by /setting/utility_bill_setup.php. An attacker submits crafted input that breaks out of the intended SQL literal and appends arbitrary clauses. Because the endpoint is reachable over the network without authentication, exploitation requires only an HTTP request to a vulnerable host.

Successful exploitation can expose tenant records, billing data, and credentials stored in the application database. Attackers can also alter records, escalate access through inserted administrator rows, or stage further attacks against connected systems. Public disclosure of the exploit details lowers the skill barrier for opportunistic actors scanning for exposed instances.

Root Cause

The root cause is missing parameterization of SQL queries that consume the txtGasBill POST parameter. The application concatenates request data into a query string instead of using prepared statements or bound parameters. This pattern aligns with [CWE-74] and the more specific SQL injection subclass (CWE-89).

Attack Vector

The attack vector is network-based and unauthenticated. An attacker submits a crafted POST request to /setting/utility_bill_setup.php with malicious content in the txtGasBill field. No user interaction is required. Refer to the GitHub Issue Discussion and VulDB CVE Analysis #321850 for proof-of-concept details.

No verified exploit code is reproduced here. See the published references for technical artifacts.

Detection Methods for CVE-2025-9643

Indicators of Compromise

HTTP POST requests to /setting/utility_bill_setup.php containing SQL meta-characters such as ', --, UNION, SLEEP(, or INFORMATION_SCHEMA in the txtGasBill parameter.
Web server access logs showing repeated requests to the utility bill setup endpoint from a single source within short time windows.
Unexpected database error messages or 500 responses originating from utility_bill_setup.php.
New or altered administrative records in the Apartment Management System database without a corresponding audit trail entry.

Detection Strategies

Deploy a Web Application Firewall (WAF) rule that inspects POST bodies sent to utility_bill_setup.php for SQL injection signatures.
Enable database query logging and alert on anomalous query patterns invoked by the web application service account.
Correlate web server logs with database audit logs to identify request-to-query chains that include attacker-supplied SQL syntax.

Monitoring Recommendations

Monitor outbound connections from the web server to unexpected destinations, which may indicate post-exploitation activity.
Track changes to user, tenant, and billing tables and alert on inserts or updates outside normal business workflows.
Baseline request volume to /setting/ endpoints and flag deviations associated with reconnaissance or automated scanning.

How to Mitigate CVE-2025-9643

Immediate Actions Required

Restrict network access to the Apartment Management System administration interface using IP allowlists or VPN-only access.
Place the application behind a WAF and enable SQL injection signature rules covering the txtGasBill parameter.
Review database audit logs for evidence of prior injection attempts against /setting/utility_bill_setup.php.
Rotate database credentials and any secrets the application service account can reach.

Patch Information

No vendor patch is currently referenced in the NVD record or the published VulDB Entry #321850. Until itsourcecode releases a fix, operators should modify utility_bill_setup.php to use parameterized queries via PDO or mysqli prepared statements, and apply server-side input validation on all numeric billing fields.

Workarounds

Replace dynamic SQL string concatenation in utility_bill_setup.php with prepared statements binding txtGasBill as a numeric parameter.
Enforce server-side type checks that reject non-numeric values submitted to billing fields.
Run the application database account with the minimum privileges necessary, removing DROP, ALTER, and FILE rights where not required.
Disable verbose database error output in production to reduce information leakage useful to attackers.

bash

# Example WAF rule (ModSecurity) blocking SQLi attempts on the affected endpoint
SecRule REQUEST_URI "@contains /setting/utility_bill_setup.php" \
  "phase:2,chain,deny,status:403,id:1009643,msg:'CVE-2025-9643 SQLi attempt'"
  SecRule ARGS:txtGasBill "@detectSQLi" "t:none"