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Date:	Fri, 30 Mar 2007 01:14:50 -0700
From:	Andrew Morton <>
Cc:	"" 
Subject: Re: [Bugme-new] [Bug 8284] New: IPsec anti-replay window management

On Fri, 30 Mar 2007 01:06:17 -0700 wrote:

>            Summary: IPsec anti-replay window management flaw
>     Kernel Version:
>             Status: NEW
>           Severity: normal
>              Owner:
>          Submitter:
> 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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