similar to: enable strong KexAlgorithms, Ciphers and MACs in /etc/ssh/sshd_config file on RHEL 8.x Linux OS

Hi Kaushal, I maintain a set of SSH hardening guides for various platforms, including RHEL 8. You can find them here: https://ssh-audit.com/hardening_guides.html - Joe -- Joseph S. Testa II Founder & Principal Security Consultant Positron Security On Thu, 2024-01-25 at 18:39 +0530, Kaushal Shriyan wrote: > Hi, > > I am running the below servers on Red Hat Enterprise

On 25.01.24 14:09, Kaushal Shriyan wrote: > I am running the below servers on Red Hat Enterprise Linux release 8.7 > How do I enable strong KexAlgorithms, Ciphers and MACs On RHEL 8, you need to be aware that there are "crypto policies" modifying sshd's behaviour, and it would likely be the *preferred* method to inject your intended config changes *there* (unless they

On Fri, Jan 26, 2024 at 7:24?PM Jochen Bern <Jochen.Bern at binect.de> wrote: > On 25.01.24 14:09, Kaushal Shriyan wrote: > > I am running the below servers on Red Hat Enterprise Linux release 8.7 > > How do I enable strong KexAlgorithms, Ciphers and MACs > > On RHEL 8, you need to be aware that there are "crypto policies" > modifying sshd's behaviour,

BTW based on your output it looks like the DEFAULT policy is just fine, If you really want to turn etm HMAC and chacha20 off, you should follow the RHEL security alert https://access.redhat.com/security/cve/cve-2023-48795 cipher at SSH = -CHACHA20-POLY1305 ssh_etm = 0 by putting these lines into `/etc/crypto-policies/policies/modules/CVE-2023-48795.pmod`, applying the resulting subpolicy

https://bugzilla.mindrot.org/show_bug.cgi?id=2333 Bug ID: 2333 Summary: forbid old Ciphers, KexAlgorithms and MACs by default Product: Portable OpenSSH Version: 6.6p1 Hardware: Other OS: Linux Status: NEW Severity: enhancement Priority: P5 Component: Miscellaneous Assignee:

Il giorno gio 22 nov 2018 alle ore 21:24 Stuart Henderson <stu at spacehopper.org> ha scritto: > > On 2018/11/22 19:55, owl700 at gmail.com wrote: > > Hi, I have compatibility issues with the latest version of > > openssh-server and an old dropbear client, the dopbear client stops at > > preauth > > > > ov 22 14:34:03 myhostname sshd[3905]: debug1: Client

Darren Tucker <dtucker at zip.com.au> writes: > On Tue, Nov 8, 2016 at 2:43 PM, Harry Putnam <reader at newsguy.com> wrote: >> Darren Tucker <dtucker at zip.com.au> writes: >> >>> On Tue, Nov 8, 2016 at 1:02 PM, Harry Putnam <reader at newsguy.com> wrote: >>> [...] >>>> gv harry> ssh -vv 2x >>>> >>>>

Am 19.10.2016 um 00:58 schrieb Gordon Messmer <gordon.messmer at gmail.com>: > On 10/18/2016 03:28 PM, Clint Dilks wrote: >> So first >> question is are people generally modifying the list of ciphers supported by >> the ssh client and sshd? > > I suspect that "generally" people are not. I do, because I can, and so that I can offer at least some advice

Hi, I have compatibility issues with the latest version of openssh-server and an old dropbear client, the dopbear client stops at preauth ov 22 14:34:03 myhostname sshd[3905]: debug1: Client protocol version 2.0; client software version dropbear_0.46 Nov 22 14:34:03 myhostname sshd[3905]: debug1: no match: dropbear_0.46 Nov 22 14:34:03 myhostname sshd[3905]: debug1: Local version string

Hi OpenSSH, I encountered that SSH will hang over after I input the password. Could you help show me how to resolve this problem? Thanks for your help. Please find the ssh debug info and my ssh version as below. $ ssh -vvv user1 at remote_host OpenSSH_6.9p1, LibreSSL 2.1.8 debug1: Reading configuration data /Users/user1/.ssh/config debug1: /Users/user1/.ssh/config line 36: Applying options for

Can you confirm if the problem is specific to the ssh client, or the ssh server? (Try to ssh into the same server from different client, and to some different server from the same client) On Mon, Oct 24, 2016 at 9:41 PM, Jin Li <lijin.abc at gmail.com> wrote: > Hi OpenSSH, > > I encountered that SSH will hang over after I input the password. > Could you help show me how to

Hi, In a recent security review some systems I manage were flagged due to supporting "weak" ciphers, specifically the ones listed below. So first question is are people generally modifying the list of ciphers supported by the ssh client and sshd? On CentOS 6 currently it looks like if I remove all the ciphers they are concerned about then I am left with Ciphers

And Server? - Ben Nick Stanoszek wrote: > Please see below :). Just a note---this is the EXACT command that I > use to log into the server BEFORE i try to update SSH. I continue to > use this same command for other servers. > > Nicks-MacBook-Pro:Downloads$ ssh -i WHATEVERKEY.pem > ubuntu at 54.200.249.185 <mailto:ubuntu at 54.200.249.185> -v -v -v -v > >

On Tue, May 02, 2017 at 06:17:47PM +0200, Cristian Ionescu-Idbohrn wrote: > $ ssh -vvv -oMacs=umac-64 at openssh.com localhost : 2>&1 | egrep -i 'macs|umac' > debug2: MACs ctos: umac-64 at openssh.com > debug2: MACs stoc: umac-64 at openssh.com > debug2: MACs ctos: umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-sha2-512-etm at openssh.com,hmac-sha1-etm

No I'm referring to "sshd -ddd" (preferrable on a high port like -p 8080 so you don't break your current ability to connect to the machine). As clearly the server is rejecting it. And only the server side debug can tell us that. - Ben Nick Stanoszek wrote: > I am using an AWS ubuntu 14.04 server...is that what you are asking? > > On Tue, Jul 28, 2015 at 10:00 PM,

Hello, I'm trying to setup a chroot for one user on my AIX 5.2 system I have tried with openssh 5.0 (don't know where it comes from) and as it didn't work, I have downloaded and compiled the current version (6.6p1) When I connect, password is checked, chroot is done, sftp subsystem is accepted, but I get disconnected without any error Below is all can say about my config (after

Thanks Darren, will check on your response. I am attaching sshd, ssh logs with debug flags. Please see if it gives any hint: when I press ^C in ssh session, no log gets printed in both server/client side. Best Regards, On Wed, Jan 18, 2017 at 3:09 AM, Darren Tucker <dtucker at zip.com.au> wrote: > On Wed, Jan 18, 2017 at 5:10 AM, Sudarshan Soma <sudarshan12s at gmail.com>

On 23/04/2018 11:49, Michael Felt wrote: > On 21/04/2018 16:21, Michael Felt wrote: > > > Question: I have not dug into the tests yet. Will copy to a "local" > directory, and not build out of tree and see if that fixes it (as it > does for many other packages). However, just in case it does not - how > can I fast-forward the tests to the "agent" tests?

I don't think it will be easy to identify the problem remotely. You can try logging in with password (if not disabled), or sshing with some other key, or logging into some other user. If you are able to get access to the machine, post the server's error log here. On Mon, Oct 24, 2016 at 9:55 PM, Jin Li <lijin.abc at gmail.com> wrote: > Hi Tanmay, > > The server is not

Hello list, To my astonishment the openssh versions on both C6 and C7 will by default negotiate an MD5 HMAC. C6 client, C7 server: debug2: mac_setup: found hmac-md5 debug1: kex: server->client aes128-ctr hmac-md5 none debug2: mac_setup: found hmac-md5 debug1: kex: client->server aes128-ctr hmac-md5 none C7 client & server: debug2: mac_setup: setup hmac-md5-etm at openssh.com debug1: