Date: Mon, 17 Feb 2020 17:48:39 +0200 From: Vikashb Badal <vikashb@where-ever.za.net> To: freebsd-questions@freebsd.org Subject: Re: disabling "weak" algorithms in sshd Message-ID: <79ccdac5-a26b-7a21-5ecb-014d526265c6@where-ever.za.net> In-Reply-To: <CAOyJeZTbbkpznciYMaCOWswrtDDbo9AGiBdw3i6tcaz__CjS%2BQ@mail.gmail.com> References: <CAOyJeZTbbkpznciYMaCOWswrtDDbo9AGiBdw3i6tcaz__CjS%2BQ@mail.gmail.com>
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On 17/02/2020 17:09, Shamim Shahriar wrote: > Good afternoon all > > I had been googling for quite some time and so far came up empty, maybe i don't know if there is a best practice for these atm, i usually update /etc/ssh/shd_config and add/replace: Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128 MACs hmac-sha1,umac-64@openssh.com,hmac-ripemd160 https://man.openbsd.org/sshd_config#Ciphers https://man.openbsd.org/sshd_config#MACs "ssh -Q cipher" and "ssh -Q mac" will provide you a list of ciphers currently allowed, > someone can shed some light or point me to the correct direction. > > I have introduced a bunch of servers into an infrastructure that previously > had zero FreeBSD system. They make use of Tenable Security Centre ( > tenable.com) which I believe used Nessus in the backend to identify > vulnerabilities. Amongst other things, it is picking up on (tenable/nessus > plugin ID 90317) "SSH Weak Algorithms Supported) because the server allows > "none" algorithms. > > Is there any way to "select" or "selectively disable" algorithms and hashes > from sshd? According to various web sources, certain implementation on > certain distributions might have options to amend the list, but none of the > examples I have found worked on my FreeBSD system. > > Would appreciate if someone could please point me to the correct direction. > > Kind regards > SK > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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