How to urgently block malicious IP addresses during SQL injection attacks?

To urgently block malicious IP addresses during SQL injection attacks, you can take the following steps:

1. Identify the Malicious IPs:

   • Use database logs, web server logs (e.g., Nginx, Apache), or security tools (e.g., WAF, IDS/IPS) to detect suspicious IP addresses attempting SQL injection.
   • Look for patterns like unusual query strings (' OR '1'='1, UNION SELECT, etc.).

2. Block IPs at the Network Level:

   • Firewall Rules: Add a rule to block the malicious IPs at the server firewall (e.g., iptables on Linux).
     Example (Linux iptables):

     iptables -A INPUT -s <malicious_ip> -j DROP
     

   • Cloud Firewall: If using a cloud provider, configure the firewall to block the IPs.
     Tencent Cloud Example: Use Security Group or Network ACL in Tencent Cloud to restrict access from suspicious IPs.

3. Block IPs at the Web Application Level:

   • WAF (Web Application Firewall): Deploy a WAF to automatically detect and block SQL injection attempts.
     Tencent Cloud Example: Use Tencent Cloud WAF to filter malicious traffic and block harmful IPs.
   • Application Logic: Implement rate-limiting or IP-based access control in your application code.

4. Monitor and Update:

   • Continuously monitor logs for new attack patterns.
   • Regularly update firewall rules and WAF policies to adapt to evolving threats.

By combining firewall rules, WAF protection, and cloud security services (like Tencent Cloud WAF), you can effectively mitigate SQL injection attacks by blocking malicious IPs.