Hello all!

I have a strange problem. I have two Linux boxes. They are connected via a LAN. From machine 1 (Fedora Core 8) I can ssh to machine 2 (Fedora Core 3)without any problems if I am logged in as root on machine 1. If I am logged in as any other non-privileged user and attempt to ssh to machine 2, I get a segmentation fault and the connection is dropped (after ssh asks for the password).

Everything was working up until last Friday (8/6/2010). I did upgrade the machine 1 from 512Kb to 2.0Gb memory then...

Any ideas?

machine1_root#ssh anyaccount@machine2 <-This works
machine1_anyotheraccount$ssh anyaccount@machine2 <-segmentation fault

Do you have /home mounted on a separate partition?
And if so, is that partition always accessible for any user?

Do you have a special NIS setup, or any other global access system?

Just asking, since these are the few main differences I know about between root and any other user.

You can try to see what different in the output of env command as root and as different user.

Running ssh -v -v -v as both users may be helpful too.

Another possibility to find a cause of trouble is running ssh under strace in both cases

Thanks for your ideas!

What I found out... I compared the /usr/local/bin/ssh binary to a similar machine with the same FC8. The files were significantly different, AND my ssh binary was dated 8/8/2010. I backed up the local ssh and replaced it with the other machine's copy and things are working correctly now.

So... as I see it I have two possible situations;

1) The machine did an automatic yum update sometime on Sunday 8/8/2010 that resulted in a new ssh binary dated that date... or...
2) I have a compromised server that needs to come off-line, get re-loaded and configured and re-deployed.

Any thoughts/comments?

Thanks!

Mark