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Message-ID: <20081015141447.GA20064@suse.de>
Date: Wed, 15 Oct 2008 16:14:47 +0200
From: Marcus Meissner <meissner@...e.de>
To: oss-security@...ts.openwall.com, coley@...re.org
Subject: Re: CVE request: kernel: sctp: Fix oops when INIT-ACK indicates that peer doesn't support AUTH
On Wed, Oct 08, 2008 at 11:53:10AM +0800, Eugene Teo wrote:
> This was committed in upstream kernel recently.
>
> "[PATCH] sctp: Fix oops when INIT-ACK indicates that peer doesn't
> support AUTH
>
> If INIT-ACK is received with SupportedExtensions parameter which
> indicates that the peer does not support AUTH, the packet will be
> silently ignore, and sctp_process_init() do cleanup all of the
> transports in the association. When T1-Init timer is expires, OOPS
> happen while we try to choose a different init transport.
>
> The solution is to only clean up the non-active transports, i.e
> the ones that the peer added. However, that introduces a problem
> with sctp_connectx(), because we don't mark the proper state for
> the transports provided by the user. So, we'll simply mark
> user-provided transports as ACTIVE. That will allow INIT
> retransmissions to work properly in the sctp_connectx() context
> and prevent the crash."
>
> Upstream commit: add52379dde2e5300e2d574b172e62c6cf43b3d3
>
> This can be triggered if the SCTP connection between both ends have
> mis-matched settings, i.e. one end with AUTH extensions enabled, and the
> other end with AUTH extension disabled. This requires a CVE name.
Has this got a CVE id?
Ciao, Marcus
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