bugtraq - Re: Linux kernel IGMP vulnerabilities

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Date: Wed, 15 Dec 2004 16:02:10 -0500
From: "Timothy  Hall" <admin@...E2WIN.NET>
To: <stephen.butler@...il.com>, <ihaquer@...c.pl>
Cc: bugtraq@...urityfocus.com, vulnwatch@...nwatch.org, security@...c.pl,
        full-disclosure@...ts.netsys.com
Subject: Re: Linux kernel IGMP vulnerabilities

Greetings Paul and Stephen and List...

Paul thanks for clearing that up.  SuSE 9.0 Pro (at least the way two
boxes I take care of are set up) have
/proc/net/igmp
/proc/net/mcfilter
but 'mcfilter' is empty.  
No local users other than myself...  At least that I can tell...  :)

TîMöTH¥ Hª££

>>> Paul Starzetz <ihaquer@...c.pl> 12/15/04 07:34AM >>>
On Tue, 14 Dec 2004, stephen joseph butler wrote:

> > /proc/net/igmp
> > /proc/net/mcfilter
> > 
> > if both exist and are non-empty you are vulnerable!
> 
> Just to be clear: if "mcfilter" is empty, then you aren't
vulnerable?
> I have both files, and "igmp" contains data, but "mcfilter" is
empty.

You are not vulnerable to the remote attack described under (3),
however 
your kernel may be still buggy. Note that you need a running process
that 
has manipulated its multicast socket filters. If your kernel is buggy
and 
you have local users such an application can always appear, at a time
you 
don't expect it.

-- 
Paul Starzetz
iSEC Security Research
http://isec.pl/ 

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