bugtraq - Re: [Security] [vendor-sec] Linux 2.4.x execve() file read race vulnerability

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Date: Fri, 27 Jun 2003 15:29:27 -0700
From: Crispin Cowan <crispin@...unix.com>
To: NC Agent <NC_Agent@...ppers-familie.de>
Cc: bugtraq@...urityfocus.com, full-disclosure@...ts.netsys.com
Subject: Re: [Security] [vendor-sec] Linux 2.4.x execve() file read race	vulnerability

NC Agent wrote:

> Hi people,
>
> again it is time to discover a funny bug inside the Linux execve() 
> system call.
> ...
> Obviously the setuid binary has been duplicated :-) (but with no 
> setuid flag of course). 

You mean there are actually still people who believe that granting x 
permission but not r permission actually prevents people from reading 
the file? I mean besides the crowd that believes in Santa Clause, the 
Easter Bunny, and Jesus :) I expect there to be a large number of ways 
to do this. This particular hack is cute, though :)

Crispin, equal opportunity offender :)

-- 
Crispin Cowan, Ph.D.           http://immunix.com/~crispin/
Chief Scientist, Immunix       http://immunix.com
            http://www.immunix.com/shop/

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