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Re: Linux kernel IGMP vulnerabilities
From: matthew-bugtraq () newtoncomputing co uk
Date: Wed, 15 Dec 2004 22:41:50 +0000

On Wed, Dec 15, 2004 at 01:34:33PM +0100, Paul Starzetz wrote:
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.

This afternoon I tried the exploit on my machine, which has exactly those
symptoms (data in igmp, mcfilter empty). It froze solid, hard power-cycle
required.

-- 
Matthew


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