Re: DNS vulnerability: other relevant software

[Eugene Teo <eteo () redhat com>]

Eugene Teo wrote:
> 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:
> > > >
> > > > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=32c1da70810017a98aa6c431a5494a302b6b9a30
> > > 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.

So I spoke to Dave Miller. He said that it is not "cryptographically
secure" to his knowledge, but in his opinion, it is good enough for port
randomisation.

Thanks, Eugene
-- 
Eugene Teo / Red Hat Security Response Team