Date: Wed, 9 Jul 2008 14:36:10 +0100 (BST) From: Mark J Cox <mjc@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: DNS vulnerability: other relevant software > 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 Vendors may with to consider backporting that kernel patch as an effective mitigation without requiring glibc changes (and with the advantage of being able to be have a customized range using ip_local_port_range etc) Cheers, Mark
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