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Date: Sun, 11 Mar 2001 22:07:31 -0800 (PST)
From: seraf@2600.com
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Subject: bin/25723: OpenSSH on 4.2 excessively regenerates RSA host key
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>Number:         25723
>Category:       bin
>Synopsis:       OpenSSH on 4.2 excessively regenerates RSA host key
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Mar 11 22:10:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     Dominick LaTrappe
>Release:        4.2-20010212-STABLE
>Organization:
>Environment:
FreeBSD pocks.tdl-m.sambuca 4.2-20010212-STABLE FreeBSD 4.2-20010212-STABLE #4: Wed Feb 13 08:09:25 UTC 2001     sysbuild@protopocks.tdl.dev.sambuca :/usr/src/sys/compile/POCKS_M  i386
>Description:
When an SSH-2 session is started with FreeBSD 4.2's sshd in "Protocol 1,2" mode (i.e., accepting both SSH-1 and SSH-2 protocols), sshd maintains an RSA host key for use with SSH-1. The life of this key, ONCE IT HAS BEEN USED, is controlled by "KeyRegenerationInterval". However, when an SSH-2 connection is established, which does not utilize said key, said key is considered "used" anyway, increasing the number of key regenerations unnecessarily.
>How-To-Repeat:
/etc/ssh/sshd_config contains "Protocols 1,2" and "KeyRegenerationInterval 1" (to make the bug dramatic ;-). Enter: "ssh -2 somebody@localhost" and then examine your sshd logs. You will see that each time an SSH-2 connection is formed, the SSH-1 RSA host key regenerates unnecessarily.
>Fix:

>Release-Note:
>Audit-Trail:
>Unformatted:

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