对于ThinkPHP框架早期版本的一个SQL注入漏洞详细分析_php实例

php.cn
Release: 2016-05-17 08:39:56
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ThinkPHP官网上曾有一段公告指出,在ThinkPHP 3.1.3及之前的版本存在一个SQL注入漏洞,漏洞存在于ThinkPHP/Lib/Core/Model.class.php 文件
根据官方文档对"防止SQL注入"的方法解释(参考http://doc.thinkphp.cn/manual/sql_injection.html)
使用查询条件预处理可以防止SQL注入,没错,当使用如下代码时可以起到效果:

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

$Model->where("id=%d and username='%s' and xx='%f'",$id,$username,$xx)->select();
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但是,当你使用如下代码时,却没有"防止SQL注入"的效果(但是官方文档却说可以防止SQL注入):

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

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

ThinkPHP/Lib/Core/Model.class.php 文件里的parseSql函数没有实现SQL过滤.
其原函数为:

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;
}
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验证漏洞(举例):
请求地址:

http://localhost/Main?id=boo" or 1="1
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http://localhost/Main?id=boo%22%20or%201=%221
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action代码:

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

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

表peipeidui所有数据被列出,SQL注入语句起效.

解决方法:

可将parseSql函数修改为:

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 $sql;
}
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总结:
1.不要过分依赖TP的底层SQL过滤,程序员要做好安全检查
2.不建议直接用$_GET,$_POST

source:php.cn
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