Date: Thu, 10 Jul 2008 17:44:45 +0800 From: Eugene Teo <eteo@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: DNS vulnerability: other relevant software 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
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