Full Disclosure: Re: Windows XP bug

[Sagar Belure <sagar.belure () gmail com>]

On Wed, Jul 7, 2010 at 10:54 AM, BlackHawk <hawkgotyou () gmail com> wrote:
> Hi list, i recently discovered a very small Windows XP bug, kind of
> useless alone but that could be usefull in some scenarios.
>
> Explanation:
>
> when you try to access a non existing directory though shell command
> "cd", XP returns an error (obviously), but if you cd to a non-existing
> & move one directory up, you'll not get any error.
>
> Example:
> ---
> C:\>cd ./somerandomchars <-- Will give an error
> Impossibile trovare il percorso specificato.
>
> C:\>cd ./somerandomchars/../ <-- Everything is ok
>
> C:\>
> ---
>
> PoC on how to make this thing usefull:
> http://www.scribd.com/doc/28080332/Podcast-Generator-1-3-Arbitrary-File-Download-Windows
>
> Hope this could be useful for you in some way..
>
> --
> BlackHawk - hawkgotyou () gmail com
>
> Sent with Gmail
>
> _______________________________________________
> Full-Disclosure - We believe in it.
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Never seen this before.
But, it's very obvious, as you are 'changing directory'(cd
thisdoesntexist/) to a non existing folder and then getting out of
it(../).

But, there is difference with evaluation/calculation in windows and linux.
Here is how...

On Windows Box...

C:\>cd thisdoesntexist/
The system cannot find the path specified.

C:\>cd thisdoesntexist/../

C:\>cd thisdoesntexist/thisonetoo/../
The system cannot find the path specified.

C:\>cd thisdoesntexist/thisonetoo/../../

C:\>


On Linux box...

one () ubuntubox:~$ cd thisdoesntexist/
-bash: cd: thisdoesntexist: No such file or directory
one () ubuntubox:~$ cd thisdoesntexist/../
-bash: cd: thisdoesntexist/../: No such file or directory
one () ubuntubox:~$


-- 
Thanks,
Sagar Belure
Security Analyst
Secfence Technologies
www.secfence.com

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