From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#22202: 24.5; SECURITY ISSUE -- Emacs Server vulnerable to random number generator attack on Windows systems Date: Wed, 30 Dec 2015 22:56:29 +0200 Message-ID: <83r3i3bqpu.fsf@gnu.org> References: <83lh8ddy45.fsf@gnu.org> <8760zh81oo.fsf@isaac.fritz.box> <83mvssc4ix.fsf@gnu.org> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1451508979 30132 80.91.229.3 (30 Dec 2015 20:56:19 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 30 Dec 2015 20:56:19 +0000 (UTC) Cc: 22202@debbugs.gnu.org, demetriobenour@gmail.com, deng@randomsample.de To: Richard Copley Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Dec 30 21:56:08 2015 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1aENmy-0002eX-FA for geb-bug-gnu-emacs@m.gmane.org; Wed, 30 Dec 2015 21:56:08 +0100 Original-Received: from localhost ([::1]:53753 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aENmx-0007Bm-TR for geb-bug-gnu-emacs@m.gmane.org; Wed, 30 Dec 2015 15:56:07 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:55175) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aENmt-0007BS-Qg for bug-gnu-emacs@gnu.org; Wed, 30 Dec 2015 15:56:04 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aENms-0004Rk-83 for bug-gnu-emacs@gnu.org; Wed, 30 Dec 2015 15:56:03 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:43081) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aENms-0004Rg-4b for bug-gnu-emacs@gnu.org; Wed, 30 Dec 2015 15:56:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84) (envelope-from ) id 1aENms-0008PB-01 for bug-gnu-emacs@gnu.org; Wed, 30 Dec 2015 15:56:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 30 Dec 2015 20:56:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 22202 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: security Original-Received: via spool by 22202-submit@debbugs.gnu.org id=B22202.145150895232293 (code B ref 22202); Wed, 30 Dec 2015 20:56:01 +0000 Original-Received: (at 22202) by debbugs.gnu.org; 30 Dec 2015 20:55:52 +0000 Original-Received: from localhost ([127.0.0.1]:50683 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1aENmi-0008On-4P for submit@debbugs.gnu.org; Wed, 30 Dec 2015 15:55:52 -0500 Original-Received: from eggs.gnu.org ([208.118.235.92]:35915) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1aENmh-0008Ob-3o for 22202@debbugs.gnu.org; Wed, 30 Dec 2015 15:55:51 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aENmb-0004Q1-6A for 22202@debbugs.gnu.org; Wed, 30 Dec 2015 15:55:45 -0500 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:60928) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aENmX-0004NG-Im; Wed, 30 Dec 2015 15:55:41 -0500 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:1856 helo=HOME-C4E4A596F7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.82) (envelope-from ) id 1aENmW-0006Tx-Ez; Wed, 30 Dec 2015 15:55:41 -0500 In-reply-to: (message from Richard Copley on Wed, 30 Dec 2015 20:47:40 +0000) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:111048 Archived-At: > Date: Wed, 30 Dec 2015 20:47:40 +0000 > From: Richard Copley > Cc: David Engster , 22202@debbugs.gnu.org, > Demetri Obenour > > Re performance: using CryptGenRandom to provide a seed for srand > is enough to address Demetri's concern. For performance reasons, > as you said, implementing random() with CryptGenRandom is > potentially bad. I think random() itself should not be changed. That'd be the worst of both worlds, IMO: a not-so-good PRNG with no way whatsoever to get a repeatable sequence. Am I right?