Known vulnerabilities for project openssh. CVE ID CPE Affected version(s) CVE-1999-1010 1999-12-14T05:00Z 2016-10-18T02:00Z.
- Submit New Release
- Edit OpenSSH Information
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- OpenSSH (OpenBSD Secure Shell) The OpenBSD project Active 1999-03-03 8.5: ossh BSD: Yes PuTTY: Simon Tatham: Active 1999-06-27 0.74: MIT: Yes SecureCRT: VanDyke Software Active 19-02-11 8.7.0: Proprietary: No Tera Term: TeraTerm Project Active 2004 2018-08-31 4.100: Tera Term Pro 2.3 (1994–1998) BSD: Yes TN3270.
- OpenSSH 8.5 / 8.5p1 (2021-03-03) OpenSSH 8.5 was released on 2021-03-03. It is available from the mirrors listed at OpenSSH is a 100% complete SSH protocol 2.0 implementation and includes sftp client and server support.
- OpenSSH is the premier connectivity tool for remote login with the SSH protocol. It encrypts all traffic to eliminate eavesdropping, connection hijacking, and other attacks. In addition, OpenSSH provides a large suite of secure tunneling capabilities, several authentication methods, and sophisticated configuration options.
- Ssh-agent のように daemon として起動し秘密の情報を保持しつつ別プロセスと通信するようなプログラムを書きたくて、ssh-agent はどう実装しているのかざっくり調べた。.
Free version of the SSH suite of network connectivity tools.
Monday, April 19, 2021
- Networking
- Telnet and SSH
OpenSSH is a FREE version of the SSH suite of network connectivity tools that increasing numbers of people on the Internet are coming to rely on. Many users of telnet, rlogin, ftp, and other such programs might not realize that their password is transmitted across the Internet unencrypted, but it is. OpenSSH encrypts all traffic (including passwords) to effectively eliminate eavesdropping, connection hijacking, and other network-level attacks. Additionally, OpenSSH provides a myriad of secure tunnelling capabilities.
- 129701
- LicenseBSD type
![Openssh for windows 10 Openssh for windows 10](/uploads/1/1/9/6/119637297/581939260.png)
Downloads / Release History
19
OpenSSH 8.6
03
OpenSSH 8.5
27
OpenSSH 8.4
18
OpenSSH 8.0
19
OpenSSH 7.9
24
OpenSSH 7.8
03
OpenSSH 7.7
Changes Drop compatibility support for some very old SSHimplementations, including ssh.com
06
OpenSSH 7.6
18
OpenSSH 7.5
Related Apps
Portable OpenSSH 8.5p1OpenSSH is a FREE version of the SSH suite of network connectivity tools.
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GTelnet 2.5Pretty and powerful frontend to telnet/ssh/rlogin client for GNOME.
Stunnel 5.59
PuTTY 0.74
Kssh 0.4.1
Enhanced TightVNC Viewer 1.0.20Enhanced TightVNC Viewer.
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Last articles
OpenSSH 8.5 has been released. It includes fixes for a couple of potentialsecurity problems (one of which only applies to Solaris hosts); it alsoenables UpdateHostKeys by default, allowing hosts with insecurekeys to upgrade them without creating scary warnings for users. There area lot of other small changes; see the announcement for details.From: | Damien Miller <djm-AT-cvs.openbsd.org> |
To: | oss-security-AT-lists.openwall.com |
Subject: | [oss-security] Announce: OpenSSH 8.5 released |
Date: | Tue, 02 Mar 2021 18:19:55 -0700 |
Message-ID: | <[email protected]> |
Archive-link: | Article |
Openssh 8.4
(Log in to post comments)OpenSSH 8.5 released
Posted Mar 3, 2021 18:13 UTC (Wed) by josh (subscriber, #17465) [Link]
> * ssh(1): disable CheckHostIP by default. It provides insignificant> benefits while making key rotation significantly more difficult,
> especially for hosts behind IP-based load-balancers.
I'm excited to see this change.
> * ssh(1): when prompting the user to accept a new hostkey, display
> any other host names/addresses already associated with the key.
> any other host names/addresses already associated with the key.
And this one, though it could produce a massive amount of output in some cases.
OpenSSH 8.5 released
Posted Mar 3, 2021 23:12 UTC (Wed) by unixbhaskar (subscriber, #44758) [Link]
> * ssh(1): when prompting the user to accept a new hostkey, display> any other host names/addresses already associated with the key.
This one would be really interesting!
OpenSSH 8.5 released
Posted Mar 4, 2021 1:03 UTC (Thu) by djm (subscriber, #11651) [Link]
> And this one, though it could produce a massive amount of output in some cases.yeah, if this turns out to be a problem in practice then let us know and we'll add a limit.
OpenSSH 8.5 released
Posted Mar 4, 2021 7:11 UTC (Thu) by josh (subscriber, #17465) [Link]
I'd expect the common case for me to be in the hundreds. That doesn't seem unreasonable, depending on how it's presented.
OpenSSH 8.5 released
Posted Mar 4, 2021 10:36 UTC (Thu) by johill (subscriber, #25196) [Link]
I think they meant *host* key, not *client* key, here? At least that's how I read it? Hmm, maybe not?
OpenSSH 8.5 released
Posted Mar 4, 2021 11:33 UTC (Thu) by nye (guest, #51576) [Link]
As in you're re-using the same host key on hundreds of machines, or you're connecting to the same machine via hundreds of aliases? Both of these seem like pretty niche use cases that I'd only expect to see in some kind of automated environment (probably involving throwaway test systems in the first case, given the risk involved in reusing a key).
OpenSSH 8.5 released
Posted Mar 4, 2021 11:37 UTC (Thu) by Cyberax (✭ supporter ✭, #52523) [Link]
No, reusing the same IP for different throwaway hosts.
OpenSSH 8.5 released
Posted Mar 4, 2021 12:21 UTC (Thu) by nye (guest, #51576) [Link]
Openssh8.5p1 Rpm
Well unless those hosts are reusing the same host key then there won't be any 'other host names/addresses already associated with the key', so you can't end up with a list containing hundreds of entries.(And if they *are* reusing the same key, then you still won't end up with such a list unless you connect via a new throwaway DNS name for each one instead of using a fixed hostname or the unchanging IP address.)
OpenSSH 8.5 released
Posted Mar 4, 2021 22:06 UTC (Thu) by Cyberax (✭ supporter ✭, #52523) [Link]
Openssh 8.5 Ubuntu
Uh, the hosts will have different keys but the same IP. So you get the dreaded 'WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED' message from SSH each time you try to connect.
OpenSSH 8.5 released
Posted Mar 4, 2021 16:16 UTC (Thu) by josh (subscriber, #17465) [Link]
Same virtual machine, same host key, no hostname, different IPs.
OpenSSH 8.5 released
Posted Mar 4, 2021 17:43 UTC (Thu) by nye (guest, #51576) [Link]
Now I'm *really* curious. What's the application here? No worries if it's something you can't/don't want to go into.
OpenSSH 8.5 released
Posted Mar 4, 2021 22:06 UTC (Thu) by josh (subscriber, #17465) [Link]
Virtual machine instances that are regularly shut down and brought back up, and don't have or need a static IP. Start instance, get IP for instance, SSH to instance, work with instance, shut down instance.
OpenSSH 8.5 released
Posted Mar 7, 2021 12:21 UTC (Sun) by vadim (subscriber, #35271) [Link]
You can configure a DHCP server to hand out leases for a long time, like a month or even a year.Then you'll have a lot less of this happening, as each VM will end up using the same address virtually all the time.
OpenSSH 8.5 released
Posted Mar 7, 2021 15:12 UTC (Sun) by Cyberax (✭ supporter ✭, #52523) [Link]
> Then you'll have a lot less of this happening, as each VM will end up using the same address virtually all the time.
Then you'll run out of addresses, since VMs are disposable and each new VM gets a new MAC.
Then you'll run out of addresses, since VMs are disposable and each new VM gets a new MAC.
OpenSSH 8.5 released
Posted Mar 8, 2021 0:22 UTC (Mon) by josh (subscriber, #17465) [Link]
Cloud providers don't typically do this in their DHCP servers. (And I think it makes sense that they don't, for a variety of reasons, not least of which that it's better to show people very quickly that IPs will change, rather than let them experience breakage later on.)
My use case: one hundred systems with the same ssh host key
![Openssh 5 compatibility Openssh 5 compatibility](/uploads/1/1/9/6/119637297/439142718.png)
Posted Mar 8, 2021 17:13 UTC (Mon) by emmi3 (guest, #62443) [Link]
I have the following setup: nearly one hundred thin clients for home office use ('Telearbeit' / tele work) running from the same live linux image.The (cutomized) images are built using live-build form debian-live. Normally live-build would delete the ssh host key during build time and live-config would create a new ssh host key on every startup. This was undesirable since ssh would complain about the changed host key after every reboot of the thin client. Therefore I baked one predefined host key directly into the image.
The thin clients are connected to our university environment via wireguard using a 10-something private subnet. Thus we have nearly one hundred different physical hosts (with different but fixed IPs and hostnames) using the same ssh host key.
I don't see anything wrong with this setup and I think this is a valid use case. If my ssh client starts complaining about all those hosts having the same host key, I will have to start creating separate keys for every client and distributing them like I do with the wireguard preshared keys and other client specific data right now. No big deal, but I don't really see any benefit from this.