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

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Date: Fri, 18 Jan 2008 08:56:00 -0500
From: "Joey Mengele" <joey.mengele@...hmail.com>
To: <fdiggle@...il.com>,<tonnerre.lombard@...roup.ch>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: [FDSA] Sort - Critical Format String
	Vulnerability

Dear Lombard Retard,

Excellent analysis, except it is completely wrong LOLOLOLOL.

Try %n.

J

"Gratitude is a sickness suffered by dogs." - Gadi Evron

On Fri, 18 Jan 2008 02:45:41 -0500 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

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