FileZilla FTP Client 3.17.0.0 - Unquoted Path Privilege Escalation

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# Exploit Title: Filezilla 3.17.0.0 windows installer Privileges Escalation
via unquoted path vulnerability
# Date: 08/05/2016
# Exploit Author: Cyril Vallicari
# Vendor Homepage: https://filezilla-project.org/
# Software Link: https://filezilla-project.org/download.php?type=client
# Version: 3.17.0.0
# Tested on: Windows 7 x64 SP1 (but it should works on all windows version)
# CVE : Asked it is reviewed (11/08/2016)


Summary : FileZilla is a free software, cross-platform FTP application,
consisting of FileZilla Client and FileZilla Server. Client binaries are
available for Windows, Linux, and Mac OS X.

Description : The installer of Filezilla for Windows version 3.17.0.0 and
probably prior and prone to unquoted path vulnerability .

The unquoted command called is : C:\Program Files\FileZilla FTP
Client\uninstall.exe _?=C:\Program Files\FileZilla FTP Client

This could potentially allow an authorized but non-privileged local user to
execute arbitrary code with elevated privileges on the system.

POC :

Put a software named "Program.exe" in C: (or named
Filezilla.exe/Filezilla FTP.exe in Program Files)

Then uninstall Filezilla from installer

After clicking "Next" on the installer window, Program.exe is execute with
Administrator rights

POC video : https://www.youtube.com/watch?v=r06VwwJ9J4M


Patch :

Fixed in version 3.17.0.1

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