netdev - Re: [Bugme-new] [Bug 8284] New: IPsec anti-replay window management flaw

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Date:	Fri, 30 Mar 2007 01:14:50 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org
Cc:	"bugme-daemon@...nel-bugs.osdl.org" 
	<bugme-daemon@...zilla.kernel.org>,
	didier.schrapf@...atelaleniaspace.com
Subject: Re: [Bugme-new] [Bug 8284] New: IPsec anti-replay window management
 flaw

On Fri, 30 Mar 2007 01:06:17 -0700 bugme-daemon@...zilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=8284
> 
>            Summary: IPsec anti-replay window management flaw
>     Kernel Version: 2.6.20.4
>             Status: NEW
>           Severity: normal
>              Owner: shemminger@...l.org
>          Submitter: didier.schrapf@...atelaleniaspace.com
> 
> 
> The IPsec ESP/AH anti-replay window size is configurable, 64 being the value 
> recommended by RFC 2406.
> Linux kernels use a 32 bit bitmap to check whether a sequence number has 
> already been received.
> 
> When a packet is received, if its seq is lower than the greatest received seq,
> and if the difference is greater than 32, the check doesn't work.
> This constitutes a security flaw.
> 
> The faulty code is in net/xfrm/xfrm-state.c, functions xfrm_replay_check() and 
> xfrm_replay_advance().
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