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Re: Magic quotes? Should I still be cautious? [message #176437 is a reply to message #176432] Fri, 06 January 2012 23:12 Go to previous messageGo to previous message
Jerry Stuckle is currently offline  Jerry Stuckle
Messages: 2598
Registered: September 2010
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On 1/6/2012 2:14 PM, Thomas Mlynarczyk wrote:
> Jerry Stuckle schrieb:
>> On 1/6/2012 6:05 AM, Thomas Mlynarczyk wrote:
>>> Jerry Stuckle schrieb:
>>>
>>>> $REQUESTS is quite dangerous. You never know whether it comes from
>>>> $_GET, $_POST or $_COOKIE, for instance.
>>>
>>> True, you don't know. But does it matter?
>>
>> No, it doesn't matter if you aren't concerned about security.
>
> I was hoping for some objective arguments, but well...
>
> Okay, let me rephrase this. Suppose you have a parameter foo which is
> expected to be sent via $_POST only. So if it's being sent via $_GET you
> refuse it as invalid. Okay. So all the attacker has to do is send it via
> $_POST and you will happily accept it. Now of course you must ensure
> that this foo parameter, even if sent via $_POST, can do no evil. You
> must properly validate it. But once you're there, you might as well
> accept it via $_GET, for what difference does it make now? You validate
> it, so it can do no harm.
>
> I repeat: An attacker can send ANYTHING via GET or POST or COOKIE as he
> chooses. YOU, therefore, cannot say "this came via POST as intended, so
> it's safe". You must not rely on the data source. Therefor, the data
> source should be irrelevant to your application and your application
> must be designed so that it doesn't matter if the data comes via GET,
> POST or COOKIE. In other words: When some evil person knocks on your
> door, it really doesn't matter if he came by train or by car to your
> doorstep. The same holds for a nice guy visiting you.
>
> Greetings,
> Thomas
>

I didn't say you didn't need to validate the parameter. But limiting
values to the proper operation makes it harder for hackers to break in.

It DOES matter where it came from - and data coming in from the wrong
variable can get their IP blocked from the site. There is no use making
it easy for them.

I have people trying to break into the sites I designed almost daily
(multiple times daily if you also include SMTP and SSH attacks). None
have succeeded.



--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================

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