bugtraq - Re: Linux kernel IGMP vulnerabilities

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Date: Tue, 14 Dec 2004 19:16:39 +0200 (EET)
From: Pekka Savola <pekkas@...core.fi>
To: security@...c.pl
Cc: bugtraq@...urityfocus.com, vulnwatch@...nwatch.org,
	full-disclosure@...ts.netsys.com
Subject: Re: Linux kernel IGMP vulnerabilities


Hi,

On Tue, 14 Dec 2004, Paul Starzetz wrote:
>
> Synopsis:  Linux kernel IGMP vulnerabilities
> Product:   Linux kernel
> Version:   2.4 up to and including 2.4.28, 2.6 up to and including 2.6.9
[...]
> Both parts of the IGMP subsystem have exploitable flaws:
>
> (1) the ip_mc_source() function, that can be called through the user API
> (the  IP_(UN)BLOCK_SOURCE,  IP_ADD/DROP_SOURCE_MEMBERSHIP  as  well   as
> MCAST_(UN)BLOCK_SOURCE  and  MCAST_JOIN/LEAVE_SOURCE_GROUP socket SOL_IP
> level options) suffers from a serious  kernel  hang  and  kernel  memory
> overwrite problem.
[...]

Does this also affect earlier 2.4 releases which did not yet 
incorporate IGMPv3?  If so, to which extent?  AFAIR, IGMPv3/MLDv2 was 
added in 2.4.22.

At least the PoC requires *_(UN)BLOCK_SOURCE APIs which were added 
with IGMPv3.

As far as I can see (a very quick look), 2.4 prior to 2.4.22 should 
not be (at least similarly) affected.

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings