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

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Message-ID: <3EFCC547.4000103@immunix.com>
From: crispin at immunix.com (Crispin Cowan)
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/