[Samba] FW: Questions about Samba 4

Stefan Metzmacher metze at samba.org
Fri Aug 28 14:38:15 UTC 2015

Hi Rowland,

> Hi Volker, it seems pretty easy to reproduce, just throw up a test DC in
> a VM, create a user and set the password to need to be changed at next
> login. Now create a member server in another VM and join this to the DC.
> now open three terminals, ssh into the member server as root from one
> and start 'top' , ssh into the member server as root from another and
> finally attempt to ssh into the member server as the user you created
> from the last one.
> Now watch the 'top' running in the other terminal, it should show
> winbind using 100% CPU (or very close to it) at this point go to the
> open root terminal and run gdb.
> I can easily reproduce it on an X86_64 machine running Samba Version
> 4.2.3-SerNet-Debian-7.wheezy

As you can easily reproduce this, can you please file a bug report
and upload network captures. For the following cases:

1. the original problem
2. with Volkers patch
3. with your changed sshd config

It would be perfect if you could also provide a keytab in order to
decrypt the krb5 traffic.

Looking at captures will likely help in order to judge if Volker's fix
is correct/complete related to security.


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