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Date: Thu, 10 Jul 2008 14:08:49 +0800
From: Eugene Teo <>
Subject: Re: DNS vulnerability: other relevant software

Eugene Teo wrote:
> Florian Weimer wrote:
>> * Mark J. Cox:
>>>> Additionally, Debian has noted (DSA 1605-1) that the GNU libc stub
>>>> resolver could benefit from random query source ports as well, but
>>>> no patches are currently available to implement this:
>>> Note that GNU libc stub resolver when used with a recent kernel
>>> (2.6.24+) will give you random UDP source ports on each request
>>> because of this Linux commit:
>> Is net_random() cryptographically secure?  The paper referenced in the
>> source doesn't talk about this.
> It isn't. It's actually a 32-bit pseudo-random number generator AFAIK.

Actually, I'm not sure. I'm checking with my colleagues who may be more
familiar with the implementation of net_random/random32() routine.

Thanks, Eugene

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