USN-3939-1: Samba vulnerability

8 April 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

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

References