From unknown Wed Mar 11 14:23:28 2026 X-Loop: owner@bugs.x2go.org Subject: Bug#333: X2Go issue (in src:x2goclient) has been marked as pending for release Reply-To: Mike Gabriel , 333@bugs.x2go.org Resent-From: Mike Gabriel Resent-To: x2go-dev@lists.berlios.de Resent-CC: X2Go Developers X-Loop: owner@bugs.x2go.org Resent-Date: Tue, 29 Oct 2013 13:18:02 +0000 Resent-Message-ID: Resent-Sender: owner@bugs.x2go.org X-X2Go-PR-Message: followup 333 X-X2Go-PR-Package: x2goclient X-X2Go-PR-Keywords: confirmed pending Received: via spool by 333-submit@bugs.x2go.org id=B333.138305255011159 (code B ref 333); Tue, 29 Oct 2013 13:18:02 +0000 Received: (at 333) by bugs.x2go.org; 29 Oct 2013 13:15:50 +0000 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on ymir.das-netzwerkteam.de X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,URIBL_BLOCKED autolearn=ham version=3.3.2 Received: from freya.das-netzwerkteam.de (freya.das-netzwerkteam.de [88.198.48.199]) by ymir (Postfix) with ESMTPS id 1A2635DA6C for <333@bugs.x2go.org>; Tue, 29 Oct 2013 14:15:50 +0100 (CET) Received: from grimnir.das-netzwerkteam.de (grimnir.das-netzwerkteam.de [78.46.204.98]) by freya.das-netzwerkteam.de (Postfix) with ESMTPS id 359BD1A54 for <333@bugs.x2go.org>; Tue, 29 Oct 2013 14:15:49 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by grimnir.das-netzwerkteam.de (Postfix) with ESMTP id B85E63BA6D for <333@bugs.x2go.org>; Tue, 29 Oct 2013 14:15:48 +0100 (CET) X-Virus-Scanned: Debian amavisd-new at grimnir.das-netzwerkteam.de Received: from grimnir.das-netzwerkteam.de ([127.0.0.1]) by localhost (grimnir.das-netzwerkteam.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id WN8xs4Ap8BT3 for <333@bugs.x2go.org>; Tue, 29 Oct 2013 14:15:48 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by grimnir.das-netzwerkteam.de (Postfix) with ESMTP id 89AD43BB68 for <333@bugs.x2go.org>; Tue, 29 Oct 2013 14:15:48 +0100 (CET) Received: from grimnir.das-netzwerkteam.de (localhost [127.0.0.1]) by grimnir.das-netzwerkteam.de (Postfix) with ESMTPSA id 386FA3BA6D; Tue, 29 Oct 2013 14:15:48 +0100 (CET) Received: from m-047.informatik.uni-kiel.de (m-047.informatik.uni-kiel.de [134.245.254.47]) by mail.das-netzwerkteam.de (Horde Framework) with HTTP; Tue, 29 Oct 2013 13:15:48 +0000 Date: Tue, 29 Oct 2013 13:15:48 +0000 Message-ID: <20131029131548.Horde.CWdPSTcHA3SBHPz5HBqibQ8@mail.das-netzwerkteam.de> From: Mike Gabriel To: Dan Halbert Cc: 333@bugs.x2go.org References: <20131029123733.54E955DB18@ymir> <526FB132.7060505@halwitz.org> In-Reply-To: <526FB132.7060505@halwitz.org> User-Agent: Internet Messaging Program (IMP) H5 (6.1.4) Accept-Language: en,de Organization: DAS-NETZWERKTEAM X-Originating-IP: 134.245.254.47 X-Remote-Browser: Mozilla/5.0 (X11; Linux x86_64; rv:23.0) Gecko/20100101 Firefox/23.0 Iceweasel/23.0 Content-Type: multipart/signed; boundary="=_PYbWfibJkTCC947zmfFVqg2"; protocol="application/pgp-signature"; micalg=pgp-sha1 MIME-Version: 1.0 This message is in MIME format and has been PGP signed. --=_PYbWfibJkTCC947zmfFVqg2 Content-Type: multipart/mixed; boundary="=_Yoe2149I4zc1bCJ-3YtYFQ1" This message is in MIME format. --=_Yoe2149I4zc1bCJ-3YtYFQ1 Content-Type: text/plain; charset=utf-8; format=flowed; DelSp=Yes Content-Disposition: inline Hi Dan, On Di 29 Okt 2013 13:59:30 CET, Dan Halbert wrote: > Hi Mike, this fix to authenticate the commands is good. I didn't > realize I was uncovering a security problem. > > One question: the underlying crash was due to bad data. If > authenticated but still bad data is sent, will the client still > crash? I am thinking about a malicious server crafting something to > crash the client or have it do something bad. I looked at the code > diff and I didn't see some underlying verification of the x2go > commands. > > E.g.: > X2GODATABEGIN: > bad data here > X2GODATAEND: I would indeed call this work in progress. See #334 for the ,,bad data here'' location you address above. We surely need a means to ensure that the data sent over the wire is sane. An idea could be to encrypt/decrypt the data asymmetrically. Maybe something else... Hmmm... I don't think that evaluating the data in itself (via regexp e.g.) will lead to good results. We should invent a method that is common to all sorts of text data and makes sure that the data is for the client that requested it. On the other hand... If you cannot trust your admin, who can you trust??? Any contribution of ideas is welcome. 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