From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: David Engster Newsgroups: gmane.emacs.bugs Subject: bug#22202: 24.5; SECURITY ISSUE -- Emacs Server vulnerable to random number generator attack on Windows systems Date: Tue, 29 Dec 2015 23:02:55 +0100 Message-ID: <87poxo7w1c.fsf@isaac.fritz.box> References: <83lh8ddy45.fsf@gnu.org> <8760zh81oo.fsf@isaac.fritz.box> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1451426661 5380 80.91.229.3 (29 Dec 2015 22:04:21 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Tue, 29 Dec 2015 22:04:21 +0000 (UTC) Cc: 22202@debbugs.gnu.org, Demetri Obenour To: Richard Copley Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Tue Dec 29 23:04:09 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 1aE2NF-0005iG-6Y for geb-bug-gnu-emacs@m.gmane.org; Tue, 29 Dec 2015 23:04:09 +0100 Original-Received: from localhost ([::1]:50355 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aE2NE-000497-NF for geb-bug-gnu-emacs@m.gmane.org; Tue, 29 Dec 2015 17:04:08 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:45713) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aE2NB-000490-DP for bug-gnu-emacs@gnu.org; Tue, 29 Dec 2015 17:04:06 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aE2N8-0003GH-8S for bug-gnu-emacs@gnu.org; Tue, 29 Dec 2015 17:04:05 -0500 Original-Received: from debbugs.gnu.org ([208.118.235.43]:41410) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aE2N8-0003GD-59 for bug-gnu-emacs@gnu.org; Tue, 29 Dec 2015 17:04:02 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84) (envelope-from ) id 1aE2N7-0005V7-Tw for bug-gnu-emacs@gnu.org; Tue, 29 Dec 2015 17:04:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: David Engster Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 29 Dec 2015 22:04:01 +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=B22202.145142658121062 (code B ref 22202); Tue, 29 Dec 2015 22:04:01 +0000 Original-Received: (at 22202) by debbugs.gnu.org; 29 Dec 2015 22:03:01 +0000 Original-Received: from localhost ([127.0.0.1]:49012 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1aE2M9-0005Ta-Hf for submit@debbugs.gnu.org; Tue, 29 Dec 2015 17:03:01 -0500 Original-Received: from randomsample.de ([5.45.97.173]:39471) by debbugs.gnu.org with esmtp (Exim 4.84) (envelope-from ) id 1aE2M8-0005TO-0u for 22202@debbugs.gnu.org; Tue, 29 Dec 2015 17:03:00 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=randomsample.de; s=a; h=Content-Type:MIME-Version:Message-ID:Date:References:In-Reply-To:Subject:Cc:To:From; bh=LyBlO0krTQ9oNzSaea4TcN9owzA3zR7v6xwcGQ5beGk=; b=Go8nNAmY4FVASwWYtvcgSGxABikPYJKpoQwm7E8o8a2sibw9yY3sYDHVEdQ2nVaZo6SdV9FDvHCw4dOkjPGW3UBdDmm73OzQWB/2B8RF05uoAHp8oIY0kqXzlhCobLJX; Original-Received: from ip4d1494ed.dynamic.kabel-deutschland.de ([77.20.148.237] helo=isaac.fritz.box) by randomsample.de with esmtpsa (TLS1.2:RSA_AES_128_CBC_SHA1:128) (Exim 4.80) (envelope-from ) id 1aE2M6-0003XA-KA; Tue, 29 Dec 2015 23:02:58 +0100 In-Reply-To: (Richard Copley's message of "Tue, 29 Dec 2015 21:22:55 +0000") User-Agent: Gnus/5.13001 (Ma Gnus v0.10) Emacs/24.5 (gnu/linux) 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:110989 Archived-At: Richard Copley writes: >>> [...] >> >> That's correct (it requires a Windows Server with enabled terminal >> services), but each user session has of course its own process space, so >> I don't see how the described attack could work there. > > Not sure what you mean by process space. As an unprivileged user > you can find other users' Emacs processes without any effort (using > tasklist.exe, for example). If you know on what port an Emacs server > is listening (which is admittedly a difficulty), you can send bytes to it. > I've just done so as an experiment. (I was driving both sessions so I > knew the server port.) You logged in with two different user accounts? I always thought sessions from different users were better isolated from one another and more similar to Linux containers. If that is not the case, then I agree the attack scenario looks feasible. -David