bugtraq - Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death Signal Vulnerability

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Message-ID: <Pine.LNX.4.44.0708150048130.2583-100000@D00M.lightwave.net.ru>
Date: Wed, 15 Aug 2007 00:49:49 +0400 (MSD)
From: Dan Yefimov <dan@...5.lightwave.net.ru>
To: Wojciech Purczynski <cliph@...c.pl>
Cc: bugtraq@...urityfocus.com
Subject: Re: COSEINC Linux Advisory #1: Linux Kernel Parent Process Death
 Signal Vulnerability

On Tue, 14 Aug 2007, Wojciech Purczynski wrote:

> 
> > I'm not sure this is a real security issue. If some process has the same
> > effective UID as the given one, the former can always send any signal to
> > the latter. Thus the behaviour you described is IMHO normal.
> 
> It becomes a security issue whenever suid process drops user's UIDs.
> 
But if it drops privileges (changes EUID back to RUID), it can't again send any 
signal to setuid process.
-- 

    Sincerely Your, Dan.