YCCMS 3.4 任意文件上传漏洞（二）¶
一、漏洞简介¶
二、漏洞影响¶
YCCMS 3.4
三、复现过程¶
在不需要登录的情况下可以看到已经上传成功，上传地址为E:/phpstudy/WWW/yccms/uploads/20200509133351770.php定位漏洞位置为controller\CallAction.class.php中的xhUp函数
public function xhUp() {
if (isset($_GET['type'])) {
$_fileupload = new FileUpload('filedata',10);
$_err=$_fileupload->checkError();
$_path = $_fileupload->getPath();
$_msg="'..$_path'";
$_img = new Image($_path);
$_img->xhImg(650,0);
$_img->out();
echo "{'err':'".$_err."','msg':".$_msg."}";
exit();
} else {
Tool::alertBack('警告：由于非法操作导致上传失败！');
}
}
跟进到类FileUpload， 位于public\class\FileUpload.class.php，然后看到同样也是检查的传入的Content-Type的值
private function checkType() {
if (!in_array($this->type,$this->typeArr)) {
Tool::alertBack('警告：不合法的上传类型！');
}
}
private $typeArr =
array('image/jpeg','image/pjpeg','image/png','image/x-png','image/gif');