A new erratum update is available for Univention Corporate Server 4.0.
It is applicable to the following patch-levels: 2.
It addresses the following problem:

Program component:  samba
Reference:          bug 39025
Fixed version:      2:4.2.3-1.758.201507271307

This update addresses the following issue:
* A coding error in the Samba implementation of the BACKUPKEY
  serverwrap protocol may cause problems with retrieving saved
  passwords on Windows clients (DPAPI).

We recommend to update your UCS installation. Updated packages are
available in the Univention online repository, which is automatically
added to the apt packages sources. The following procedures can be
used to update a UCS installation:

1. A single system can be updated in the web interface of the
Univention Management Console through the "Software update" module.

2. A single system can be updated on the command line by running the
command "univention-upgrade"

3. Multiple systems can be updated through a maintenance policy.

Additional information can be found in the UCS manual.