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On a FreeBSD system (8.1), I am looking for instructions on how to check the running version of OpenSSH and also instructions on the best way to download install an update of OpenSSH

ICTdesk.net
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4 Answers4

90

Run sshd -V or ssh -V and they'll return the version and usage information.
Note: These are capital "V" now, when I originally wrote this answer they were lower case.

There's a dozen ways to upgrade.

  • pkg-add -r openssh-portable
  • cd /usr/ports/security/openssh && make install clean
  • portupgrade security/openssh-portable
  • part of the makeworld/buildworld process
  • freebsd-upgrade
  • and the list goes on...

I'm not aware of any issues with the 5.2p1 version that shipped with 8.1-RELEASE. I have seen hoax e-mails flying around for over a year now announcing the imminent release of a zero day hack (note that it's been a year and a half since release, so 'zero' day was a heck of a long time ago).

Chris S
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5
telnet localhost 22

Why do you want to upgrade OpenSSH? It's part of the core system and is usually upgraded with the system.

Eugene Yarmash
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4

How to find openssh version on a Linux or Unix-like system?

The syntax is as follows to find openssh version on a CentOS/RHEL/SL:

# yum list installed openssh\*

The syntax is as follows to find openssh version on a Debian/Ubuntu Linux:

$ dpkg --list | grep openssh
### OR ###
$ dpkg --list openssh\*

Sample output

Community
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naXa stands with Ukraine
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3

Try running:

which sshd

If that prints /usr/sbin/sshd, then it's probably installed as a package. In that case, you can check the installed version using:

pkg_info | grep ssh

or:

pkg_info -W `type sshd`

And I think you update it using:

pkg_add -r openssh-portable

but read the FreeBSD Guide to the Packages System first, because I haven't done that in a long time and it might have changed.

If

which sshd

prints /usr/local/sbin/sshd, then it's probably installed as a port.

Read up on how to upgrade it in the Guide to Using the Ports System. The port name is security/openssh-portable, i.e. /usr/ports/security/openssh-portable.

Mikel
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    Of course, if you really wanted the running version rather than the installed version, you could also try "telnet localhost 22", and look for the version number. The version number is the second number, i.e. the number after "OpenSSH_". – Mikel Dec 16 '10 at 11:36
  • See also http://www.geekvenue.net/chucktips/jason/chuck/1044986336/index_html – Mikel Dec 16 '10 at 11:53