GNU bug report logs - #17660
24.3; gnutls-min-prime-bits is 256

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Package: emacs;

Reported by: Juliusz Chroboczek <jch <at> pps.univ-paris-diderot.fr>

Date: Sun, 1 Jun 2014 13:25:01 UTC

Severity: important

Tags: fixed, security

Found in version 24.3

Fixed in version 25.1

Done: Lars Magne Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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From: Ted Zlatanov <tzz <at> lifelogs.com>
To: Juliusz Chroboczek <jch <at> pps.univ-paris-diderot.fr>
Cc: 17660 <at> debbugs.gnu.org
Subject: bug#17660: 24.3; gnutls-min-prime-bits is 256
Date: Thu, 05 Jun 2014 10:30:53 -0400

On Sun, 01 Jun 2014 15:23:49 +0200 Juliusz Chroboczek <jch <at> pps.univ-paris-diderot.fr> wrote: 

JC> In gnutls.el, I see
JC>   (defcustom gnutls-min-prime-bits 256
JC>      ...)

JC> This uses 256 bits for Diffie-Helman rather than the gnutls default, which
JC> seems awfully low to me.

JC> It looks like this was lowered due to bug#11267.  I suggest that it really
JC> should be set to a reasonable value.

Please read through bug#11267 and bug#15057. The recommended solution
from the GnuTLS maintainer was to avoid the DH exchange that requires
`gnutls-min-prime-bits' altogether.  So the proper fix seems to be to
change the default for `gnutls-algorithm-priority' but that may break
some people's setups (just like raising `gnutls-min-prime-bits' would).

Ted
This bug report was last modified 10 years and 253 days ago.

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