=========================================================================Ubuntu Security Notice USN-3939-1
April 08, 2019

samba vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Samba could be made to create files in unexpected locations.

Software Description:
- samba: SMB/CIFS file, print, and login server for Unix

Details:

Michael Hanselmann discovered that Samba incorrectly handled registry
files. A remote attacker could possibly use this issue to create new
registry files outside of the share, contrary to expectations.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.10:
  libsmbclient                    2:4.8.4+dfsg-2ubuntu2.3
  samba                           2:4.8.4+dfsg-2ubuntu2.3

Ubuntu 18.04 LTS:
  libsmbclient                    2:4.7.6+dfsg~ubuntu-0ubuntu2.9
  samba                           2:4.7.6+dfsg~ubuntu-0ubuntu2.9

Ubuntu 16.04 LTS:
  libsmbclient                    2:4.3.11+dfsg-0ubuntu0.16.04.19
  samba                           2:4.3.11+dfsg-0ubuntu0.16.04.19

Ubuntu 14.04 LTS:
  libsmbclient                    2:4.3.11+dfsg-0ubuntu0.14.04.20
  samba                           2:4.3.11+dfsg-0ubuntu0.14.04.20

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-3939-1
  CVE-2019-3880

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.8.4+dfsg-2ubuntu2.3
  https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.9
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.19
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.14.04.20