Detailed analysis of a SQL injection vulnerability in early versions of the ThinkPHP framework_PHP Tutorial

There was an announcement on the ThinkPHP official website stating that there is a SQL injection vulnerability in ThinkPHP 3.1.3 and previous versions. The vulnerability exists in the ThinkPHP/Lib/Core/Model.class.php file
According to the official documentation, the method of "preventing SQL injection" is explained (refer to http://doc.thinkphp.cn/manual/sql_injection.html)
Using query condition preprocessing can prevent SQL injection. Yes, it can be effective when using the following code:

$Model->where("id=%d and username='%s' and xx='%f'",array($id,$username,$xx))->select();

or

$Model->where("id=%d and username='%s' and xx='%f'",$id,$username,$xx)->select();

However, when you use the following code, there is no "preventing SQL injection" effect (but the official document says that it can prevent SQL injection):

$model->query('select * from user where id=%d and status=%s',$id,$status);

or

$model->query('select * from user where id=%d and status=%s',array($id,$status));

Cause analysis:

The parseSql function in the ThinkPHP/Lib/Core/Model.class.php file does not implement SQL filtering.
Its original function is:

protected function parseSql($sql,$parse) {
// 分析表达式
if(true === $parse) {
  $options = $this->_parseOptions();
  $sql =  $this->db->parseSql($sql,$options);
}elseif(is_array($parse)){ // SQL预处理
  $sql = vsprintf($sql,$parse);
}else{
  $sql  =  strtr($sql,array('__TABLE__'=>$this->getTableName(),'__PREFIX__'=>C('DB_PREFIX')));
}
$this->db->setModel($this->name);
return $sql;
}

Verification vulnerability (example):
Request address:

http://localhost/Main?id=boo" or 1="1

or

http://localhost/Main?id=boo%22%20or%201=%221

action code:

$model=M('Peipeidui');
$m=$model->query('select * from peipeidui where name="%s"',$_GET['id']);
dump($m);exit;

or:

$model=M('Peipeidui');
$m=$model->query('select * from peipeidui where name="%s"',array($_GET['id']));
dump($m);exit;

Result:

All data in table peipeidui is listed, and the SQL injection statement takes effect.

Solution:

The parseSql function can be modified to:

protected function parseSql($sql,$parse) {
// 分析表达式
if(true === $parse) {
  $options = $this->_parseOptions();
  $sql =  $this->db->parseSql($sql,$options);
}elseif(is_array($parse)){ // SQL预处理
  $parse = array_map(array($this->db,'escapeString'),$parse);//此行为新增代码
  $sql = vsprintf($sql,$parse);
}else{
  $sql  =  strtr($sql,array('__TABLE__'=>$this->getTableName(),'__PREFIX__'=>C('DB_PREFIX')));
}
$this->db->setModel($this->name);
return $sql;
}

Summary:
1. Don’t rely too much on TP’s underlying SQL filtering. Programmers must do security checks
2. It is not recommended to use $_GET, $_POST directly

http://www.bkjia.com/PHPjc/824645.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/824645.htmlTechArticleThere was an announcement on the ThinkPHP official website stating that there is a SQL injection vulnerability in ThinkPHP 3.1.3 and previous versions. The vulnerability exists in the ThinkPHP/Lib/Core/Model.class.php file. According to the official documentation...