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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。