#472 - Upgrade SSH key exchange and message authentication code from SHA1 to SHA2

X2Go Bug report logs - #472
Upgrade SSH key exchange and message authentication code from SHA1 to SHA2

Reported by: Aurélien Grosdidier <aurelien.grosdidier@gmail.com>

Date: Thu, 3 Apr 2014 14:35:02 UTC

Severity: important

Found in version 4.0.1.3-1

Subject: Bug#472: [X2Go-Dev] Bug#472: Debian now has diffie-hellman-group1-sha1 disabled
Reply-To: Oleksandr Shneyder <o.shneyder@phoca-gmbh.de>, 472@bugs.x2go.org
Resent-From: Oleksandr Shneyder <o.shneyder@phoca-gmbh.de>
Resent-To: x2go-dev@lists.x2go.org
Resent-CC: X2Go Developers <x2go-dev@lists.x2go.org>
Resent-Date: Mon, 13 Oct 2014 13:55:02 +0000
Resent-Message-ID: <handler.472.B472.141320826416496@bugs.x2go.org>
Resent-Sender: owner@bugs.x2go.org
Message-ID: <543BD4D8.5060309@phoca-gmbh.de>
Date: Mon, 13 Oct 2014 15:34:16 +0200
From: Oleksandr Shneyder <o.shneyder@phoca-gmbh.de>
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Icedove/24.5.0
MIME-Version: 1.0
To: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>, 
 Alex DEKKER <bugs@ale.cx>,
 472@bugs.x2go.org
CC: o.schneyder@phoca-gmbh.de
References: <20141011204801.Horde.PMP6WPnVUe8IpbJWVualAQ4@mail.das-netzwerkteam.de>
In-Reply-To: <20141011204801.Horde.PMP6WPnVUe8IpbJWVualAQ4@mail.das-netzwerkteam.de>
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And why is it a problem for X2Go? Is libssh not working any more? Then it should be fixed in libssh, not in x2go? Am 11.10.2014 22:48, schrieb Mike Gabriel: > Control: severity -1 important > > HI Alex (DEKKER), hi Alex (Schneyder), > > On Sa 11 Okt 2014 13:07:00 CEST, Alex DEKKER wrote: > >> As of Version: 1:6.7p1-1 of openssh-server, it appears that Debian >> [and presumably upstream]'s sshd now has diffie-hellman-group1-sha1 >> disabled. This means that connections from x2goclient will fail. >> >> I was able to work around this by adding: >> >> KexAlgorithms >> curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 >> >> >> to /etc/ssh/sshd_config, but obviously at some point support for >> diffie-hellman-group1-sha1 is going to go away completely, rather than >> just being disabled by default. > > Thanks for bringing this up. Did not realize so far. > > @Alex Schneyder: do you think you can find a fix for this. This actually > is a release blocker of 4.0.3.0... And it endangers the status of X2Go > Client in Debian, as well. > > Mike > > -- ----------------------------------------------------------- Oleksandr Shneyder | Email: o.shneyder@phoca-gmbh.de phoca GmbH | Tel. : 0911 - 14870374 0 Ludwig-Feuerbach-str. 18 | Fax. : 0911 - 14870374 9 D-90489 Nürnberg | Mobil: 0163 - 49 64 461 Geschäftsführung: Dipl.-Inf. Oleksandr Shneyder Amtsgericht München | http://www.phoca-gmbh.de HRB 196 658 | http://www.x2go.org USt-IdNr.: DE281977973 -----------------------------------------------------------

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X2Go Bug report logs - #472 Upgrade SSH key exchange and message authentication code from SHA1 to SHA2

X2Go Bug report logs - #472
Upgrade SSH key exchange and message authentication code from SHA1 to SHA2