full-disclosure - Re: Windows Command Processor CMD.EXE Buffer Overflow

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Date: Mon, 23 Oct 2006 08:31:44 -0800
From: "C. Hamby" <fixer@....net>
To: Tillmann Werner <tillmann.werner@....de>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: Windows Command Processor CMD.EXE
	Buffer	Overflow

This looks more like the command processor itself is reporting an error
because of length.  The %COMSPEC% variable is kind of an odd thing to
use if the shell is already open (you usually see that in VBS to call
the current command shell followed by the /K to keep it open).  Then
again I could be totally wrong....it does happen from time to time :-)

I agree with Tillman, this doesn't look like a security issue.

-cdh

Tillmann Werner wrote:
> Luis,
> 
>> Tried it on Win2k3 SP1:
>> C:\Documents and Settings\Administrator>%COMSPEC% /K
>> "dir\\?\AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
>> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
>> A AAAA
>> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
>> A AAAA
>> AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"
>> System replied:
>> The filename or extension is too long.
>>
>>
>> YEah! Buffer Overflow Windows XP SP2
>>
>> I Hill debug this.
> 
> What makes you think there is a buffer overflow? I'd say the 'dir' command 
> reports an error for parameters beyond 256 chars. Just plain error handling, 
> not a security issue, or am I missing something?
> 
> Tillmann
> 
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