#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

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Date: Sat, 11 Oct 2014 20:48:01 +0000
Message-ID: <20141011204801.Horde.PMP6WPnVUe8IpbJWVualAQ4@mail.das-netzwerkteam.de>
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: Alex DEKKER <bugs@ale.cx>, 472@bugs.x2go.org
Cc: o.schneyder@phoca-gmbh.de
Subject: Re: [X2Go-Dev] Bug#472: Debian now has diffie-hellman-group1-sha1
 disabled
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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 -- DAS-NETZWERKTEAM mike gabriel, herweg 7, 24357 fleckeby fon: +49 (1520) 1976 148 GnuPG Key ID 0x25771B31 mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de freeBusy: https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.xfb

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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