full-disclosure - Re: [FDSA] Sort - Critical Format String Vulnerability

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Date: Fri, 18 Jan 2008 11:39:10 -0600
From: reepex <reepex@...il.com>
To: "Tonnerre Lombard" <tonnerre.lombard@...roup.ch>, 
	full-disclosure@...ts.grok.org.uk
Subject: Re: [FDSA] Sort - Critical Format String
	Vulnerability

LOL you are an idiot

could you please google format string 101, read the printf man page, and
leave security forever

On Jan 18, 2008 1:45 AM, Tonnerre Lombard <tonnerre.lombard@...roup.ch>
wrote:

> Salut, Fredrick,
>
> On Thu, 17 Jan 2008 12:05:13 -0600 "Fredrick Diggle"
> <fdiggle@...il.com> wrote:
> > The following output shows a manafestation of this vulnerability:
> >
> > C:\>sort AAAA%x.%x.%x.%x
> > AAAA7c812f39.0.0.41414141The system cannot find the file specified.
>
> This is actually confirmed on Windows 2000 and XP.
>
> > This vulnerability can be trivially exploited to execute arbitrary
> > code on the computer machine.
>
> There I don't agree however, it is a simple memory reading
> vulnerability.
>
> > The following command line will use sort.exe to execute the windows
> > calculator.
> >
> > C:\>sort CALC.EXE%x%x%x%n | calc
>
> That's not very surprising since you pipe into the calculator so it is
> spawned by the shell.
>
> > Severity: Quite High
>
> There I don't agree. In theory, there should not be anything important
> in the memory of the sort process which is not already known to the
> user executing it anyway. It is clearly a bug though, and wants to be
> fixed. So congratulations to a working, though overdramatizised,
> discovered format string vulnerability.
>
>                                Tonnerre
> --
> SyGroup GmbH
> Tonnerre Lombard
>
> Solutions Systematiques
> Tel:+41 61 333 80 33            Güterstrasse 86
> Fax:+41 61 383 14 67            4053 Basel
> Web:www.sygroup.ch              tonnerre.lombard@...roup.ch
>
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