Re: [Full-disclosure] PHP Array and Null Bytes

[Stefan Lochbihler <steve01@xxxxxxxxx>]

Before i start to read the whole source please tell me if php act 
according to the rules.

Once again  - when i create the following array with apostrophes 
<http://odge.de/englisch-deutsch/apostrophe.html> in php

arr['\0'] = ...

the output from <<print_r>> is as  follow: Array( [\0]  ...)

When i create the array with quotes the output is as follow:

arr["\0"] = ... Array ( Null Byte)

When i create the array from the url with register globals on

arr[%00]  the output is as follow:  Simply nothing  !

PS: read the php source, 'array's are implemented in Zend/zend_hash.c
    
     I know that i could do this, but it cost a lot of time and 
therefor i decided
     to ask someone who may had the same problem :-)

regards

Steve






upb schrieb:
> read the php source, 'array's are implemented in Zend/zend_hash.c :)
>
> On 11/10/06, Stefan Lochbihler <steve01@xxxxxxxxx> wrote:
> > Hi guys,
> >
> > some questions to NULL Bytes within PHP Arrays.
> >
> > Let us assume there exist a php script with the following code.
> >
> > $erg=$_GET['show']
> >
> > if(!isset($arr[$erg]) $erg="something";
> >
> > $arr is a predefined variable but with "register globals on" it would be
> > possible to set your own Array Key. This means when you set
> >
> > $erg=test
> > $arr[test]
> >
> > you could deliver almost every chars you want. My problem is that
> > i want to deliver a content like that.
> >
> > $erg=index.html%00
> > $arr[index.html%00]
> >
> > The problem is that the Null Byte within the array destroy the array.
> > My question is if there exist a way to avoid the Null Byte within
> > the array. For example (im not really familiar with charsets)
> > to create the Null Byte with the help of f.e. UTF-7 encoded
> > chars.
> >
> > If someone has an idea please let me know.
> >
> > Best regards
> >
> > Steve
> >
> >
> >
> > _______________________________________________
> > Full-Disclosure - We believe in it.
> > Charter: http://lists.grok.org.uk/full-disclosure-charter.html
> > Hosted and sponsored by Secunia - http://secunia.com/

begin:vcard
fn:Steve
n:Lochbihler;Stefan
email;internet:steve01@xxxxxxxxx
x-mozilla-html:FALSE
url:http://www.xion-security.at
version:2.1
end:vcard

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