컴퓨터 / Computer
CentOS 7에서 firewall-cmd를 이용하여 ip 블럭하기
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2020.06.08 12:02
갑작스레 웹 서버가 느려질때가 있는데 그때 잽싸게 httpd의 로그를 봐서 아래와 같은 내용이 있는지 확인해 보라. ( ip는 숨김 )
X.X.XX.XX - - [04/May/2020:19:54:23 +0900] "GET /category.php?c=11917%20UNION%20ALL%20SELECT%20%28SELECT%20CONCAT%280x71716b6271%2CIFNULL%28CAST%28order_addpoint%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_amount%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_amount_point%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_amount_real%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_cart%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_dlvdate%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_id%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_method%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_quota%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_regdate%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_regip%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_request%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_shipping%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_shop%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_status%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_supplyprice%20AS%20CHAR%29%2C0x20%29%2C0x626661766e77%2CIFNULL%28CAST%28order_user%20AS%20CHAR%29%2C0x20%29%2C0x7171707671%29%20FROM%20checkbox.order_data%20LIMIT%2047860%2C1%29%2CNULL%2CNULL--%20pjNN HTTP/1.1" 200 89986 "-" "sqlmap/1.3#pip (http://sqlmap.org)" |
저 로그들은 DB 인젝션 공격을 할때 생기는데, 실제 DB로 갈때는 아래와 같이 전달된다.
select cnt from view_goods_cnt_w_status_lteq_2_by_cat1 where cat1 = '11917 UNION ALL SELECT (SELECT select * from goods g join category c on g.category_id = c.category_id where c.cat1 = '11917 UNION |
저런 스크립트는 DB 서버를 과부하로 이끌어 사망하게 만든다.
여러가지 방법이 있지만 이런 경우 저 위에 ip를 firewall-cmd를 이용하여 블럭 처리해 버리면 된다. 아래 명령어로.
firewall-cmd --permanent --add-rich-rule='rule family="ipv4" source address=ip drop' |
물론 저 명령어를 실행한 후에는 적용도 해 줘야 한다.
firewall-cmd --reload |
로 해 보랍니다.
출처 : http://blog.servis.co.kr/index.php/2019/01/31/centos7-firewalld/