full-disclosure - PHP Array and Null Bytes

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Message-ID: <45547047.60701@chello.at>
Date: Fri, 10 Nov 2006 13:27:51 +0100
From: Stefan Lochbihler <steve01@...llo.at>
To: full-disclosure@...ts.grok.org.uk
Subject: PHP Array and Null Bytes

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

View attachment "steve01.vcf" of type "text/x-vcard" (150 bytes)

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